Abstract

This study introduces a “greener” green monochromatic phosphor-converted light-emitting diode (pc-LED) using a band-pass filter (BPF) combined with a long-pass dichroic filter (LPDF) and a short-pass dichroic filter (SPDF) to improve the color quality of our previously developed LPDF-capped green pc-LED. This can also address the drawbacks of III-V semiconductor-type green LEDs, which show a low luminous efficacy and a poor current dependence of the efficacy and color coordinates compared to blue semiconductor-type LEDs. The optical properties of green monochromatic pc-LEDs using a BPF are compared with those of LPDF-capped green pc-LEDs, which have a broad band spectrum, and III-V semiconductor-type green LEDs by changing the transmittance wavelength range of the BPF and the peak wavelength of the green phosphors. BPF-capped green monochromatic pc-LEDs provide a high luminous efficacy (134 lm/W at 60 mA), and “greener” 1931 Commission Internationale d'Eclairage (CIE; CIEx, CIEy) color coordinates (0.24, 0.66) owing to the narrowed emission spectrum. We also propose a two-dimensional (2D) polystyrene (PS) microbead (2-μm diameter) monolayer as a scattering layer to overcome the poor angular dependence of the color coordinates of the transmitted light through a nano-multilayered dichroic filter such as an LPDF or BPF. The 2D PS scattering layer improves the angular dependence of the green color emitted from a BPF-capped green pc-LED with only 3% loss of luminous efficacy.

© 2013 OSA

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2012 (1)

2011 (3)

2010 (4)

S. Fujita, Y. Umayahara, and S. Tanabe, “Influence of light scattering on luminous efficacy in Ce:YAG glass-ceramic phosphor,” J. Ceram. Soc. Jpn.118(1374), 128–131 (2010).
[CrossRef]

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010).
[CrossRef]

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

2009 (4)

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

M. H. Crawford, “LEDs for solid-state lighting: performance challenges and recent advances,” IEEE J. Sel. Top. Quantum Electron.15(4), 1028–1040 (2009).
[CrossRef]

J. R. Oh, S.-H. Cho, Y.-H. Lee, and Y. R. Do, “Enhanced forward efficiency of Y3Al5O12:Ce3+ phosphor from white light-emitting diodes using blue-pass yellow-reflection filter,” Opt. Express17(9), 7450–7457 (2009).
[CrossRef] [PubMed]

2008 (1)

P. Schmidt, A. Tuecks, H. Bechtel, and D. Weichert, Proc. SPIE7058, 70580L (2008).
[CrossRef]

2007 (1)

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

2005 (2)

M. S. Shur and A. Žukauskas, “Solid-state lighting: toward superior illumination,” Proc. IEEE93(10), 1691–1703 (2005).
[CrossRef]

J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005).
[CrossRef]

1996 (1)

1966 (1)

Ballen, T. A.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Baumeister, P. W.

Baur, J.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Bechtel, H.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

P. Schmidt, A. Tuecks, H. Bechtel, and D. Weichert, Proc. SPIE7058, 70580L (2008).
[CrossRef]

Bergbauer, W.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Chen, C.-H.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Cho, S.-H.

Choi, J. C.

J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005).
[CrossRef]

Coltrin, M. E.

J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010).
[CrossRef]

Crawford, M. H.

J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010).
[CrossRef]

M. H. Crawford, “LEDs for solid-state lighting: performance challenges and recent advances,” IEEE J. Sel. Top. Quantum Electron.15(4), 1028–1040 (2009).
[CrossRef]

DenBaars, S. P.

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

Do, Y. R.

Fujita, S.

S. Fujita, Y. Umayahara, and S. Tanabe, “Influence of light scattering on luminous efficacy in Ce:YAG glass-ceramic phosphor,” J. Ceram. Soc. Jpn.118(1374), 128–131 (2010).
[CrossRef]

Haase, M. A.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Hahn, B.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Hao, B.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Jeon, P. E.

J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005).
[CrossRef]

Kim, J. S.

J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005).
[CrossRef]

Kim, W.

Kim, Y.-K.

Kouh, T.-J.

Krames, M. R.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Kurai, S.

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

Laubsch, A.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Leatherdale, C. A.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Lee, Y.-H.

Masui, H.

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

Meyer, T.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Miller, T. J.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Mishra, U. K.

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

Moon, J. H.

J. R. Oh, J. H. Moon, S. Yoon, C. R. Park, and Y. R. Do, “Fabrication of wafer-scale polystyrene photonic crystal multilayers via the layer-by-layer scooping transfer technique,” J. Mater. Chem.21(37), 14167–14172 (2011).
[CrossRef]

Mueller, G. O.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Mueller-Mach, R.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Nakamura, S.

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

Oh, J. H.

Oh, J. R.

Park, C. R.

J. R. Oh, J. H. Moon, S. Yoon, C. R. Park, and Y. R. Do, “Fabrication of wafer-scale polystyrene photonic crystal multilayers via the layer-by-layer scooping transfer technique,” J. Mater. Chem.21(37), 14167–14172 (2011).
[CrossRef]

Park, H. K.

Park, H. L.

J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005).
[CrossRef]

Peter, M.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Sabathil, M.

M. Peter, A. Laubsch, W. Bergbauer, T. Meyer, M. Sabathil, J. Baur, and B. Hahn, “New developments in green LEDs,” Phys. Stat. Solidi A.206(6), 1125–1129 (2009).
[CrossRef]

Sakura, H.

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

Schmidt, P.

P. Schmidt, A. Tuecks, H. Bechtel, and D. Weichert, Proc. SPIE7058, 70580L (2008).
[CrossRef]

Schmidt, P. J.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Shchekin, O. B.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Shur, M. S.

M. S. Shur and A. Žukauskas, “Solid-state lighting: toward superior illumination,” Proc. IEEE93(10), 1691–1703 (2005).
[CrossRef]

Simmons, J. A.

J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010).
[CrossRef]

Smith, T. L.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Steigelmann, O.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, O. B. Shchekin, P. J. Schmidt, H. Bechtel, C.-H. Chen, and O. Steigelmann, “All-nitride monochromatic amber-emitting phosphor-converted light-emitting diodes,” Phys. Stat. Solidi RRL.3(7–8), 215–217 (2009).
[CrossRef]

Sun, X.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Sung, Y.-G.

Taguchi, T.

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

Tanabe, S.

S. Fujita, Y. Umayahara, and S. Tanabe, “Influence of light scattering on luminous efficacy in Ce:YAG glass-ceramic phosphor,” J. Ceram. Soc. Jpn.118(1374), 128–131 (2010).
[CrossRef]

Toublanc, D.

Tsao, J. Y.

J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010).
[CrossRef]

Tuecks, A.

P. Schmidt, A. Tuecks, H. Bechtel, and D. Weichert, Proc. SPIE7058, 70580L (2008).
[CrossRef]

Turner, A. F.

Uchida, Y.

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

Umayahara, Y.

S. Fujita, Y. Umayahara, and S. Tanabe, “Influence of light scattering on luminous efficacy in Ce:YAG glass-ceramic phosphor,” J. Ceram. Soc. Jpn.118(1374), 128–131 (2010).
[CrossRef]

Weichert, D.

P. Schmidt, A. Tuecks, H. Bechtel, and D. Weichert, Proc. SPIE7058, 70580L (2008).
[CrossRef]

Xie, J.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Yang, Z. H.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Yoon, S.

J. R. Oh, J. H. Moon, S. Yoon, C. R. Park, and Y. R. Do, “Fabrication of wafer-scale polystyrene photonic crystal multilayers via the layer-by-layer scooping transfer technique,” J. Mater. Chem.21(37), 14167–14172 (2011).
[CrossRef]

Zhang, J.

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

Žukauskas, A.

M. S. Shur and A. Žukauskas, “Solid-state lighting: toward superior illumination,” Proc. IEEE93(10), 1691–1703 (2005).
[CrossRef]

Appl. Opt. (2)

Appl. Phys. Lett. (1)

M. A. Haase, J. Xie, T. A. Ballen, J. Zhang, B. Hao, Z. H. Yang, T. J. Miller, X. Sun, T. L. Smith, and C. A. Leatherdale, “II-VI semiconductor color converters for efficient green, yellow, and red light emitting diodes,” Appl. Phys. Lett.96(23), 231116 (2010).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

M. H. Crawford, “LEDs for solid-state lighting: performance challenges and recent advances,” IEEE J. Sel. Top. Quantum Electron.15(4), 1028–1040 (2009).
[CrossRef]

IEEE Trans. Electron. Dev. (1)

H. Masui, S. Nakamura, S. P. DenBaars, and U. K. Mishra, “Nonpolar and semipolar III-nitride light-emitting diodes: achievements and challenges,” IEEE Trans. Electron. Dev.57(1), 88–100 (2010).
[CrossRef]

J. Ceram. Soc. Jpn. (1)

S. Fujita, Y. Umayahara, and S. Tanabe, “Influence of light scattering on luminous efficacy in Ce:YAG glass-ceramic phosphor,” J. Ceram. Soc. Jpn.118(1374), 128–131 (2010).
[CrossRef]

J. Light & Vis. Env. (1)

S. Kurai, H. Sakura, Y. Uchida, and T. Taguchi, “Fabrication and illuminance properties of phosphor-conversion green light-emitting diode with a luminous efficacy over 100 lm/W,” J. Light & Vis. Env.31(3), 28–30 (2007).

J. Mater. Chem. (1)

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Figures (12)

Fig. 1
Fig. 1

Schematic diagrams of different types of green monochromatic LEDs. (a) III-V semiconductor-type green LED, (b) green pc-LED with high-concentration phosphor paste, (c) LPDF-capped green pc-LED, and (d) BPF-capped green pc-LED.

Fig. 2
Fig. 2

(a) PL spectra of green phosphors excited with a 365nm excitation source and EL spectra of (b) a green pc-LED with glass (c) a green pc-LED with LPDF515, and (d) a green pc-LED with LPDF535 as a function of the peak wavelength of the green phosphors. (inset: the 1931 CIE color coordinates).

Fig. 3
Fig. 3

The full width at half maximum of green phosphors excited with a 365nm excitation source, a green pc-LED with glass, a green pc-LED with LPDF515, and a green pc-LED with LPDF535 as a function of the peak wavelength of the green phosphors.

Fig. 4
Fig. 4

Transmittance spectra and photographs of LPDFs (a) L515, (b) L535 (inset: left: reflectance; right: transmittance) and SPDFs (c) S550, (d) S580 (inset: left: transmittance; right: reflectance).

Fig. 5
Fig. 5

Transmittance spectra and photographs of each BPF: (a) BPF515-550, (b) BPF515-580, (c) BPF 535-550, and (d) BPF535-580 (inset: left: reflectance; right: transmittance).

Fig. 6
Fig. 6

Transmittance spectra of (a) L515, (b) S580, and (c) BPF 535-580 as a function of the viewing angle between 0° and 60° in the normal direction.

Fig. 7
Fig. 7

FE-SEM (a) top view and (b) side view images of 2D scattering layer on the BPF (BPF535-580) substrate.

Fig. 8
Fig. 8

EL spectra of the BPF-capped green monochromatic pc-LEDs (a) BPF515-550, (b) BPF515-580, (c) BPF535-550, and (d) BPF535-580 as a function of the peak wavelengths of the green phosphors. (inset: The 1931 CIE color coordinates).

Fig. 9
Fig. 9

The full width at half maximum of the BPF-capped green monochromatic pc-LEDs (a) BPF515-550, (b) BPF515-580, (c) BPF535-550, and (d) BPF535-580 as a function of the peak wavelengths of the green phosphors.

Fig. 10
Fig. 10

Luminous efficacies of green semiconductor type LED, green pc-LEDs without filter (glass), LWPF-capped and BPF-capped green monochromatic pc-LEDs: (a) L515 series (L515, BPF515-550, BPF515-580), and (b) L535 series (L535, BPF535-550, BPF535-580) as a function of the peak wavelengths of the green phosphors with an applied current of 60mA.

Fig. 11
Fig. 11

Schematic diagrams of (a) III-V semiconductor-type green LED, (b) BPF-capped green pc-LED, and (c) 2D-scattering-layer modified BPF-capped green pc-LED. Relative luminous flux and EL spectra (inset) of (d) III-V semiconductor-type green LED, (e) BPF535-580-capped G521 green pc-LED, and (f) 2D-scattering-layer modified BPF535-580-capped G521 green pc-LED, and 1931 color coordinates of (g) III-V semiconductor-type green LED, (h) BPF535-580-capped G521 green pc-LED, and (i) 2D-scattering-layer modified BPF535-580-capped G521 green pc-LED as a function of viewing angle at normal mode.

Fig. 12
Fig. 12

(a) Luminous flux, (b) luminous efficacy, and (c) CIE color coordinates of blue LED, III-V semiconductor-type green LED, BPF535-580-capped G521 green pc-LED, and 2D-scattering-layer modified BPF535-580-capped G521 green pc-LED as a function of applied current (arrow indicates increasing current). (d) Normalized quantum efficiency, (e) Luminous efficacy, and (f) CIE color coordinates of blue LED, III-V semiconductor-type green LED, BPF535-580-capped G521 green pc-LED, and 2D-scattering-layer modified BPF535-580-capped G521 green pc-LED as a function of ambient temperature (arrow indicates increasing temperature).

Tables (2)

Tables Icon

Table 1 Thicknesses of TiO2 and SiO2 layers.

Tables Icon

Table 2 Compositions and names of BPFs.

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