Abstract

A novel green emitting phosphor of Eu2+ doped Ca7(PO4)2(SiO4)2 was synthesized and its photoluminescence properties were investigated for application in UV LEDs. XRD was used to identify sample phase. Diffuse reflection spectra and photoluminescence spectra were used to investigate its photoluminescence properties. Ca7(PO4)2(SiO4)2:Eu2+ showed an absorption ranging from 240 to 440 nm in ultraviolet range and a broad green emission band peaked at 522 nm. The concentration quenching mechanism and the key parameters for the fabrication of WLEDs, such as the temperature dependent photoluminescence and CIE value had also been studied.

© 2014 Optical Society of America

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    [CrossRef]
  2. H. A. Höppe, “Recent developments in the field of inorganic phosphors,” Angew. Chem. Int. Ed. Engl.48(20), 3572–3582 (2009).
    [CrossRef] [PubMed]
  3. H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
    [CrossRef]
  4. G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
    [CrossRef]
  5. R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
    [CrossRef]
  6. S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
    [CrossRef]
  7. A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
    [CrossRef]
  8. R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
    [CrossRef] [PubMed]
  9. J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
    [CrossRef]
  10. J. Zhang and N. Tansu, “Engineering of AlGaN-Delta-GaN Quantum-Well Gain Media for Mid- and Deep-Ultraviolet Lasers,” IEEE Photonics J.5(2), 2600209 (2013).
    [CrossRef]
  11. Y. Taniyasu and M. Kasu, “Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices,” Appl. Phys. Lett.99(25), 251112 (2011).
    [CrossRef]
  12. Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
    [CrossRef]
  13. M. Saradhi and U. Varadaraju, “Photoluminescence Studies on Eu2+-Activated Li2SrSiO4: a Potential Orange-Yellow Phosphor for Solid-State Lighting,” Chem. Mater.18(22), 5267–5272 (2006).
    [CrossRef]
  14. M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
    [CrossRef]
  15. W. Fix, H. Heymann, and R. Heinke, “Subsolidus Relations in the System 2CaO·SiO2-3CaO·P2O5,” J. Am. Ceram. Soc.52(6), 346–347 (1969).
    [CrossRef]
  16. S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
    [CrossRef]
  17. W. Eysel and T. Hahn, “Polymorphism and solid solution of Ca2GeO4 and Ca2SiO4,” Zeitschrift fur Kristallographic, Bd.131(1-6), 322–341 (1970).
    [CrossRef]
  18. D. Wei, Y. Huang, and H. Seo, “Novel yellowish-green emitting luminescence in Ca7Si2P2O16:Eu2+ phosphor,” Mater. Res. Bull.48(9), 3614–3619 (2013).
    [CrossRef]
  19. R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
    [CrossRef]
  20. G. Blasse, “Energy Transfer in Oxidic Phosphors,” Phys. Lett.28(6), 444–445 (1968).
    [CrossRef]
  21. Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
    [CrossRef]
  22. D. Dexter, “A theory of sensitized luminescence in solids,” J. Chem. Phys.21(5), 836 (1953).
    [CrossRef]
  23. L. Uitert, “Characterization of Energy transfer interactions between rare earth ions,” J. Electrochem. Soc.114(10), 1048–1053 (1967).
    [CrossRef]
  24. P. Dorenbos, “Thermal quenching of Eu2+ 5d–4f luminescence in inorganic compounds,” J. Phys. Condens. Matter17(50), 8103–8111 (2005).
    [CrossRef]
  25. H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
    [CrossRef]
  26. H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
    [CrossRef]
  27. J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
    [CrossRef]
  28. Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
    [CrossRef] [PubMed]
  29. S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
    [CrossRef] [PubMed]
  30. S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
    [CrossRef]

2013

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

J. Zhang and N. Tansu, “Engineering of AlGaN-Delta-GaN Quantum-Well Gain Media for Mid- and Deep-Ultraviolet Lasers,” IEEE Photonics J.5(2), 2600209 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

D. Wei, Y. Huang, and H. Seo, “Novel yellowish-green emitting luminescence in Ca7Si2P2O16:Eu2+ phosphor,” Mater. Res. Bull.48(9), 3614–3619 (2013).
[CrossRef]

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

2012

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
[CrossRef]

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

2011

Y. Taniyasu and M. Kasu, “Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices,” Appl. Phys. Lett.99(25), 251112 (2011).
[CrossRef]

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

2010

J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
[CrossRef]

2009

H. A. Höppe, “Recent developments in the field of inorganic phosphors,” Angew. Chem. Int. Ed. Engl.48(20), 3572–3582 (2009).
[CrossRef] [PubMed]

2008

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

2007

R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
[CrossRef]

2006

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

M. Saradhi and U. Varadaraju, “Photoluminescence Studies on Eu2+-Activated Li2SrSiO4: a Potential Orange-Yellow Phosphor for Solid-State Lighting,” Chem. Mater.18(22), 5267–5272 (2006).
[CrossRef]

2005

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

P. Dorenbos, “Thermal quenching of Eu2+ 5d–4f luminescence in inorganic compounds,” J. Phys. Condens. Matter17(50), 8103–8111 (2005).
[CrossRef]

2004

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

2003

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

1970

W. Eysel and T. Hahn, “Polymorphism and solid solution of Ca2GeO4 and Ca2SiO4,” Zeitschrift fur Kristallographic, Bd.131(1-6), 322–341 (1970).
[CrossRef]

1969

W. Fix, H. Heymann, and R. Heinke, “Subsolidus Relations in the System 2CaO·SiO2-3CaO·P2O5,” J. Am. Ceram. Soc.52(6), 346–347 (1969).
[CrossRef]

1968

G. Blasse, “Energy Transfer in Oxidic Phosphors,” Phys. Lett.28(6), 444–445 (1968).
[CrossRef]

1967

L. Uitert, “Characterization of Energy transfer interactions between rare earth ions,” J. Electrochem. Soc.114(10), 1048–1053 (1967).
[CrossRef]

1953

D. Dexter, “A theory of sensitized luminescence in solids,” J. Chem. Phys.21(5), 836 (1953).
[CrossRef]

Arif, R.

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
[CrossRef]

Blasse, G.

G. Blasse, “Energy Transfer in Oxidic Phosphors,” Phys. Lett.28(6), 444–445 (1968).
[CrossRef]

Choi, J.

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

Choi, S.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Deng, D.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Dexter, D.

D. Dexter, “A theory of sensitized luminescence in solids,” J. Chem. Phys.21(5), 836 (1953).
[CrossRef]

Ding, Y.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Dorenbos, P.

P. Dorenbos, “Thermal quenching of Eu2+ 5d–4f luminescence in inorganic compounds,” J. Phys. Condens. Matter17(50), 8103–8111 (2005).
[CrossRef]

Drozd, V.

Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
[CrossRef]

Dupuis, R.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Ee, Y.

R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
[CrossRef]

Eysel, W.

W. Eysel and T. Hahn, “Polymorphism and solid solution of Ca2GeO4 and Ca2SiO4,” Zeitschrift fur Kristallographic, Bd.131(1-6), 322–341 (1970).
[CrossRef]

Feldmann, C.

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

Fischer, A.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Fix, W.

W. Fix, H. Heymann, and R. Heinke, “Subsolidus Relations in the System 2CaO·SiO2-3CaO·P2O5,” J. Am. Ceram. Soc.52(6), 346–347 (1969).
[CrossRef]

Hahn, T.

W. Eysel and T. Hahn, “Polymorphism and solid solution of Ca2GeO4 and Ca2SiO4,” Zeitschrift fur Kristallographic, Bd.131(1-6), 322–341 (1970).
[CrossRef]

Han, M.

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

Hannah, M.

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

Happek, U.

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

Heinke, R.

W. Fix, H. Heymann, and R. Heinke, “Subsolidus Relations in the System 2CaO·SiO2-3CaO·P2O5,” J. Am. Ceram. Soc.52(6), 346–347 (1969).
[CrossRef]

Heward, W.

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

Heymann, H.

W. Fix, H. Heymann, and R. Heinke, “Subsolidus Relations in the System 2CaO·SiO2-3CaO·P2O5,” J. Am. Ceram. Soc.52(6), 346–347 (1969).
[CrossRef]

Hirosaki, N.

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Hong, K.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Höppe, H. A.

H. A. Höppe, “Recent developments in the field of inorganic phosphors,” Angew. Chem. Int. Ed. Engl.48(20), 3572–3582 (2009).
[CrossRef] [PubMed]

Huang, K.

Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
[CrossRef]

Huang, Y.

D. Wei, Y. Huang, and H. Seo, “Novel yellowish-green emitting luminescence in Ca7Si2P2O16:Eu2+ phosphor,” Mater. Res. Bull.48(9), 3614–3619 (2013).
[CrossRef]

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

Hur, S.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Ji, M.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Jing, X.

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

Jo, D.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Justel, T.

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

Kakihana, M.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Kasu, M.

Y. Taniyasu and M. Kasu, “Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices,” Appl. Phys. Lett.99(25), 251112 (2011).
[CrossRef]

Kim, C.

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

Kim, D.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Kim, H.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Kim, J.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

Kim, S.

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

Li, H.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Li, Y.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Liao, L.

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

Lim, M.

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

Liu, G.

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

Liu, R.

Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
[CrossRef]

Luo, Y.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Masaki, T.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Mitomo, M.

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Nakai, Y.

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

Nie, Q.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Park, H.

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

Park, I.

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Park, J.

M. Lim, J. Park, C. Kim, H. Park, and M. Han, “Luminescence characteristics of green light emitting Ba2SiO4:Eu2+ phosphor,” J. Mater. Sci. Lett.22(19), 1351–1353 (2003).
[CrossRef]

Park, Y.

J. Kim, Y. Park, S. Kim, J. Choi, and H. Park, “Temperature-dependent emission spectra of M2SiO4:Eu2+ (M= Ca, Sr, Ba) phosphors for green and greenish white LEDs,” Solid State Commun.133(7), 445–448 (2005).
[CrossRef]

Ponce, F.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Roh, H.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Ronda, C.

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

Ryou, J.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Sakuma, K.

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Saradhi, M.

M. Saradhi and U. Varadaraju, “Photoluminescence Studies on Eu2+-Activated Li2SrSiO4: a Potential Orange-Yellow Phosphor for Solid-State Lighting,” Chem. Mater.18(22), 5267–5272 (2006).
[CrossRef]

Satter, M.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Schmidt, P.

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

Senthil, K.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Seo, H.

D. Wei, Y. Huang, and H. Seo, “Novel yellowish-green emitting luminescence in Ca7Si2P2O16:Eu2+ phosphor,” Mater. Res. Bull.48(9), 3614–3619 (2013).
[CrossRef]

Seo, H. J.

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

Setlur, A.

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

Song, H.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “A novel green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for applications in n-UV based w-LEDS,” Mater. Chem. Phys.139(2-3), 350–354 (2013).
[CrossRef]

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Suehiro, T.

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Tan, C.

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

Taniyasu, Y.

Y. Taniyasu and M. Kasu, “Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices,” Appl. Phys. Lett.99(25), 251112 (2011).
[CrossRef]

Tansu, N.

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

J. Zhang and N. Tansu, “Engineering of AlGaN-Delta-GaN Quantum-Well Gain Media for Mid- and Deep-Ultraviolet Lasers,” IEEE Photonics J.5(2), 2600209 (2013).
[CrossRef]

J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
[CrossRef]

R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
[CrossRef]

Tezuka, S.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Toda, K.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Tsuboi, T.

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

Uitert, L.

L. Uitert, “Characterization of Energy transfer interactions between rare earth ions,” J. Electrochem. Soc.114(10), 1048–1053 (1967).
[CrossRef]

Varadaraju, U.

M. Saradhi and U. Varadaraju, “Photoluminescence Studies on Eu2+-Activated Li2SrSiO4: a Potential Orange-Yellow Phosphor for Solid-State Lighting,” Chem. Mater.18(22), 5267–5272 (2006).
[CrossRef]

Wang, X.

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

Wang, Y.

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

Wei, D.

D. Wei, Y. Huang, and H. Seo, “Novel yellowish-green emitting luminescence in Ca7Si2P2O16:Eu2+ phosphor,” Mater. Res. Bull.48(9), 3614–3619 (2013).
[CrossRef]

Xia, Z.

Z. Xia, R. Liu, K. Huang, and V. Drozd, “Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes,” J. Mater. Chem.22(30), 15183–15189 (2012).
[CrossRef]

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

Xie, R.

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Xu, F.

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

Xu, S.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Yamamoto, Y.

R. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro, and K. Sakuma, “Optical Properties of Eu2+ in γ-SiAlON,” J. Phys. Chem. B108(32), 12027–12031 (2004).
[CrossRef]

Yim, D.

H. Roh, S. Hur, H. Song, I. Park, D. Yim, D. Kim, and K. Hong, “Luminescence properties of Ca5(PO4)2(SiO4): Eu2+ green phosphor for near UV-based white LED,” Mater. Lett.70, 37–39 (2012).
[CrossRef]

Yin, H.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Yoder, P.

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Yoon, D.

Y. Luo, D. Jo, K. Senthil, S. Tezuka, M. Kakihana, K. Toda, T. Masaki, and D. Yoon, “Synthesis of high efficient Ca2SiO4:Eu2+ green emitting phosphor by a liquid phase precursor method,” J. Solid State Chem.189, 68–74 (2012).
[CrossRef]

Yu, C.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Yu, H.

H. Yu, D. Deng, Y. Li, S. Xu, Y. Li, C. Yu, Y. Ding, H. Li, H. Yin, and Q. Nie, “Electronic strcuture and luminescent properties of Ca5(PO4)2(SiO4):Eu2+ green emitting phosphor for white light emitting diodes,” Opt. Commun.289, 103–108 (2013).
[CrossRef]

Zhang, J.

J. Zhang and N. Tansu, “Engineering of AlGaN-Delta-GaN Quantum-Well Gain Media for Mid- and Deep-Ultraviolet Lasers,” IEEE Photonics J.5(2), 2600209 (2013).
[CrossRef]

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
[CrossRef]

Zhang, S.

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
[CrossRef] [PubMed]

Zhao, H.

H. Zhao, G. Liu, J. Zhang, R. Arif, and N. Tansu, “Analysis of Internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes,” J. Disp. Technol.9(4), 212–225 (2013).
[CrossRef]

J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
[CrossRef]

Adv. Funct. Mater.

C. Feldmann, T. Justel, C. Ronda, and P. Schmidt, “Inorganic luminescent materials: 100 years of research and application,” Adv. Funct. Mater.13(7), 511–516 (2003).
[CrossRef]

Angew. Chem. Int. Ed. Engl.

H. A. Höppe, “Recent developments in the field of inorganic phosphors,” Angew. Chem. Int. Ed. Engl.48(20), 3572–3582 (2009).
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Appl. Phys. Lett.

J. Zhang, H. Zhao, and N. Tansu, “Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers,” Appl. Phys. Lett.97(11), 111105 (2010).
[CrossRef]

R. Arif, Y. Ee, and N. Tansu, “Polarization engineering via staggered InGaN quantum wells for radiative efficiency enhancement of light emitting diodes,” Appl. Phys. Lett.91(9), 091110 (2007).
[CrossRef]

S. Choi, M. Ji, J. Kim, H. Kim, M. Satter, P. Yoder, J. Ryou, R. Dupuis, A. Fischer, and F. Ponce, “Efficiency droop due to electron spill-over and limited hole injection in III-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers,” Appl. Phys. Lett.101(16), 161110 (2012).
[CrossRef]

Y. Taniyasu and M. Kasu, “Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices,” Appl. Phys. Lett.99(25), 251112 (2011).
[CrossRef]

Ceram. Int.

S. Hur, H. Song, H. Roh, D. Kim, and K. Hong, “Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs,” Ceram. Int.39(8), 9791–9795 (2013).
[CrossRef]

Chem. Mater.

M. Saradhi and U. Varadaraju, “Photoluminescence Studies on Eu2+-Activated Li2SrSiO4: a Potential Orange-Yellow Phosphor for Solid-State Lighting,” Chem. Mater.18(22), 5267–5272 (2006).
[CrossRef]

A. Setlur, W. Heward, M. Hannah, and U. Happek, “Incorporation of Si4+-N3- into Ce3+-doped garnets for warm white LED phosphors,” Chem. Mater.20(19), 6277–6283 (2008).
[CrossRef]

R. Xie, N. Hirosaki, T. Suehiro, F. Xu, and M. Mitomo, “A Simple, Efficient Synthetic Route to Sr2Si5N8:Eu2+-Based Red Phosphors for White Light-emitting Diodes,” Chem. Mater.18(23), 5578–5583 (2006).
[CrossRef] [PubMed]

IEEE Photonics J.

J. Zhang and N. Tansu, “Engineering of AlGaN-Delta-GaN Quantum-Well Gain Media for Mid- and Deep-Ultraviolet Lasers,” IEEE Photonics J.5(2), 2600209 (2013).
[CrossRef]

G. Liu, J. Zhang, C. Tan, and N. Tansu, “Efficiency-droop suppression by using large-bandgap AlGaInN thin barrier layers in InGaN quantum-well light-emitting diodes,” IEEE Photonics J.5(2), 2201011 (2013).
[CrossRef]

Inorg. Chem.

Z. Xia, X. Wang, Y. Wang, L. Liao, and X. Jing, “Synthesis, structure, and thermally stable luminescence of Eu2+ doped Ba2Ln(BO3)2Cl (Ln = Y, Gd and Lu) host compounds,” Inorg. Chem.50(20), 10134–10142 (2011).
[CrossRef] [PubMed]

S. Zhang, Y. Nakai, T. Tsuboi, Y. Huang, and H. J. Seo, “The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure,” Inorg. Chem.50(7), 2897–2904 (2011).
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J. Am. Ceram. Soc.

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Figures (7)

Fig. 1
Fig. 1

XRD patterns of C7P2S2:xEu2+ (0.5% ≤ x ≤ 7%).

Fig. 2
Fig. 2

Diffuse reflection spectra of C7P2S2:xEu2+ (0.5% ≤ x ≤ 7%).

Fig. 3
Fig. 3

PLE (λem = 522 nm) (a) and PL (λex = 365 nm) (b) spectra of C7P2S2:x3Eu2+.

Fig. 4
Fig. 4

The dependence of lgI/x on lgx in C7P2S2:Eu2+.

Fig. 5
Fig. 5

CIE coordinate and the digital photo of C7P2S2:0.03Eu2+ under UV lamp.

Fig. 6
Fig. 6

(a) Temperature dependent PL spectra of C7P2S2:0.03Eu2+, inset shows the brightness versus temperature (λex = 365 nm), (b) CIE coordinate versus temperature.

Fig. 7
Fig. 7

The Arrhenius fitting of the emission intensity of C7P2S2:0.03Eu2+ and the calculated ΔE for thermal quenching.

Tables (1)

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Table 1 Characteristics of C7P2S2:Eu2+ and Eu2+ doped Ca-Si-P-O compounds.

Equations (3)

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R c 2 ( 3 V 4 π X c N ) 1 / 3
I / x = K [ 1 + β ( x ) θ / 3 ] 1
I T = I 0 1+cexp( ΔE kT )

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