Abstract

We report tunable luminescence in oxygen-deficient CaO-Al2O3-GeO2 glasses. The glass samples were prepared by adding metal Al instead of corresponding oxide (Al2O3). Efficient blue and red emissions were observed when excited by 300 and 370 nm ultraviolet light, respectively. By adjusting the content of metal Al, we could control the quantities of the defects which results in tunable luminescence from blue to white to red. Furthermore the resultant oxygen-deficient glasses have shown bright white luminescence when the excitation wavelength tuned to 335nm. Our method opens a new route for the white light illumination.

© 2007 Optical Society of America

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  1. P. Szuromi and D. Clery, "Control and use of defects in materials," Science. 281, 939-940 (1998).
    [CrossRef]
  2. K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
    [CrossRef]
  3. H. Hosono, Y. Abe, D. L. Kinser, R. A. Weeks, K. Muta, and H. Kawazoe, "Nature and origin of the 5-eV band in SiO2:GeO2 glasses," Phys. Rev. B 46, 11 445-11 451 (1992).
    [CrossRef]
  4. E. Yablonovitch, "Inhibited Spontaneous Emission in Solid-State Physics and Electronics," Phys. Rev. Lett. 58, 2059-2062 (1987).
    [CrossRef] [PubMed]
  5. Y. Amemiya and J. Miyahara, "Imaging plate illuminates many fields," Nature (London).  336, 89-90 (1988).
    [CrossRef]
  6. K. Takahashi, J. Miyahara, and Y. Shibahara, "Photostimulated luminescence (PSL) and color centers in BaFX:Eu2+ (X = Cl, Br, I) phosphors," J. Electrochem. Soc. 132, 1492-1494 (1985).
    [CrossRef]
  7. J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
    [CrossRef]
  8. J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
    [CrossRef]
  9. J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
    [CrossRef]
  10. M. C. Wang, J. S. Wang, and M. H. Hon, "Effect of Na2O addition on the optical properties and chemical durability of Li2O-CaO-Al2O3-GeO2 glass," Jpn. J. Appl. Phys. 33, 2651-2655 (1994).
    [CrossRef]
  11. L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
    [CrossRef]
  12. S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, "Bright white light through up-conversion of a single NIR source from sol-gel-derived thin film made with Ln3+-doped LaF3 nanoparticles," J. Am. Chem. Soc. 127, 12464-12465 (2005).
    [CrossRef] [PubMed]
  13. M. J. BowersII, J. R. McBride, and S. J. Rosenthal, "White-light emission from magic-sized cadmium selenide nanocrystals," J. Am. Chem. Soc. 127, 15378-15379 (2005).
    [CrossRef]
  14. J. M. Stevels, "Ultraviolet transmittivity of glasses," Proceedings 11th International CongressPure and Applied Chemistry. 5, 519-521 (1953).
  15. M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
    [CrossRef]
  16. D. P. Poulios, J. P. Spoonhower, and N. P. Bigelow, "Influence of oxygen deficiencies and hydrogen-loading on defect luminescence in irradiated Ge-doped silica glasses," J. Lumin. 101, 23-33 (2003).
    [CrossRef]
  17. K. Awazu, K. Muta, and H. Kawazoe, ‘Formation mechanism of hydrogen-associated defect with an 11.9 mT doublet in electron spin resonance and red luminescence in 9SiO2:GeO2 fibers," J. Appl. Phys. 75, 2237-2240 (1993).
    [CrossRef]
  18. M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
    [CrossRef]
  19. http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie.html#c2.

2005

S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, "Bright white light through up-conversion of a single NIR source from sol-gel-derived thin film made with Ln3+-doped LaF3 nanoparticles," J. Am. Chem. Soc. 127, 12464-12465 (2005).
[CrossRef] [PubMed]

M. J. BowersII, J. R. McBride, and S. J. Rosenthal, "White-light emission from magic-sized cadmium selenide nanocrystals," J. Am. Chem. Soc. 127, 15378-15379 (2005).
[CrossRef]

2003

D. P. Poulios, J. P. Spoonhower, and N. P. Bigelow, "Influence of oxygen deficiencies and hydrogen-loading on defect luminescence in irradiated Ge-doped silica glasses," J. Lumin. 101, 23-33 (2003).
[CrossRef]

2001

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

1999

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

1998

P. Szuromi and D. Clery, "Control and use of defects in materials," Science. 281, 939-940 (1998).
[CrossRef]

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

1997

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
[CrossRef]

1994

M. C. Wang, J. S. Wang, and M. H. Hon, "Effect of Na2O addition on the optical properties and chemical durability of Li2O-CaO-Al2O3-GeO2 glass," Jpn. J. Appl. Phys. 33, 2651-2655 (1994).
[CrossRef]

1993

K. Awazu, K. Muta, and H. Kawazoe, ‘Formation mechanism of hydrogen-associated defect with an 11.9 mT doublet in electron spin resonance and red luminescence in 9SiO2:GeO2 fibers," J. Appl. Phys. 75, 2237-2240 (1993).
[CrossRef]

1989

M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
[CrossRef]

1988

Y. Amemiya and J. Miyahara, "Imaging plate illuminates many fields," Nature (London).  336, 89-90 (1988).
[CrossRef]

1987

E. Yablonovitch, "Inhibited Spontaneous Emission in Solid-State Physics and Electronics," Phys. Rev. Lett. 58, 2059-2062 (1987).
[CrossRef] [PubMed]

1985

K. Takahashi, J. Miyahara, and Y. Shibahara, "Photostimulated luminescence (PSL) and color centers in BaFX:Eu2+ (X = Cl, Br, I) phosphors," J. Electrochem. Soc. 132, 1492-1494 (1985).
[CrossRef]

1978

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

1953

J. M. Stevels, "Ultraviolet transmittivity of glasses," Proceedings 11th International CongressPure and Applied Chemistry. 5, 519-521 (1953).

Amemiya, Y.

Y. Amemiya and J. Miyahara, "Imaging plate illuminates many fields," Nature (London).  336, 89-90 (1988).
[CrossRef]

Awazu, K.

K. Awazu, K. Muta, and H. Kawazoe, ‘Formation mechanism of hydrogen-associated defect with an 11.9 mT doublet in electron spin resonance and red luminescence in 9SiO2:GeO2 fibers," J. Appl. Phys. 75, 2237-2240 (1993).
[CrossRef]

M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
[CrossRef]

Bigelow, N. P.

D. P. Poulios, J. P. Spoonhower, and N. P. Bigelow, "Influence of oxygen deficiencies and hydrogen-loading on defect luminescence in irradiated Ge-doped silica glasses," J. Lumin. 101, 23-33 (2003).
[CrossRef]

Bowers, M. J.

M. J. BowersII, J. R. McBride, and S. J. Rosenthal, "White-light emission from magic-sized cadmium selenide nanocrystals," J. Am. Chem. Soc. 127, 15378-15379 (2005).
[CrossRef]

Chen, B.

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

Clery, D.

P. Szuromi and D. Clery, "Control and use of defects in materials," Science. 281, 939-940 (1998).
[CrossRef]

Fujii, Y.

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

Fujimaki, M.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Hill, K. O.

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

Hirao, K.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

Hon, M. H.

M. C. Wang, J. S. Wang, and M. H. Hon, "Effect of Na2O addition on the optical properties and chemical durability of Li2O-CaO-Al2O3-GeO2 glass," Jpn. J. Appl. Phys. 33, 2651-2655 (1994).
[CrossRef]

Huang, L.

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

Inouye, H.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

Iwabuchi, Y.

J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

Johnson, D. C.

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

Kasahara, T.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Katoh, T.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Kawasaki, B.

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

Kawazoe, H.

K. Awazu, K. Muta, and H. Kawazoe, ‘Formation mechanism of hydrogen-associated defect with an 11.9 mT doublet in electron spin resonance and red luminescence in 9SiO2:GeO2 fibers," J. Appl. Phys. 75, 2237-2240 (1993).
[CrossRef]

M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
[CrossRef]

Kohketsu, M.

M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
[CrossRef]

Kondo, Y.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

Lin, J.

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

Liu, X.

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

McBride, J. R.

M. J. BowersII, J. R. McBride, and S. J. Rosenthal, "White-light emission from magic-sized cadmium selenide nanocrystals," J. Am. Chem. Soc. 127, 15378-15379 (2005).
[CrossRef]

Mitsuyu, T.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

Miura, K.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

Miyahara, J.

Y. Amemiya and J. Miyahara, "Imaging plate illuminates many fields," Nature (London).  336, 89-90 (1988).
[CrossRef]

K. Takahashi, J. Miyahara, and Y. Shibahara, "Photostimulated luminescence (PSL) and color centers in BaFX:Eu2+ (X = Cl, Br, I) phosphors," J. Electrochem. Soc. 132, 1492-1494 (1985).
[CrossRef]

Miyazaki, N.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Muta, K.

K. Awazu, K. Muta, and H. Kawazoe, ‘Formation mechanism of hydrogen-associated defect with an 11.9 mT doublet in electron spin resonance and red luminescence in 9SiO2:GeO2 fibers," J. Appl. Phys. 75, 2237-2240 (1993).
[CrossRef]

Nishikawa, H.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Ohki, Y.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Poulios, D. P.

D. P. Poulios, J. P. Spoonhower, and N. P. Bigelow, "Influence of oxygen deficiencies and hydrogen-loading on defect luminescence in irradiated Ge-doped silica glasses," J. Lumin. 101, 23-33 (2003).
[CrossRef]

Qiu, J.

J. Qiu, K. Miura, H. Inouye, Y. Kondo, T. Mitsuyu, and K. Hirao, "Femtosecond laser-induced three-dimensional bright and long-lasting phosphorescence inside calcium aluminosilicate glasses doped with rare earth ions," Appl. Phys. Lett. 73, 1763-1765 (1998).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
[CrossRef]

Raudsepp, M.

S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, "Bright white light through up-conversion of a single NIR source from sol-gel-derived thin film made with Ln3+-doped LaF3 nanoparticles," J. Am. Chem. Soc. 127, 12464-12465 (2005).
[CrossRef] [PubMed]

Rosenthal, S. J.

M. J. BowersII, J. R. McBride, and S. J. Rosenthal, "White-light emission from magic-sized cadmium selenide nanocrystals," J. Am. Chem. Soc. 127, 15378-15379 (2005).
[CrossRef]

Shibahara, Y.

K. Takahashi, J. Miyahara, and Y. Shibahara, "Photostimulated luminescence (PSL) and color centers in BaFX:Eu2+ (X = Cl, Br, I) phosphors," J. Electrochem. Soc. 132, 1492-1494 (1985).
[CrossRef]

Shimizugawa, Y.

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi and K. Hirao, "Photostimulated luminescence in Eu2+-doped fluoroaluminate glasses," Appl. Phys. Lett. 71, 759-761 (1997).
[CrossRef]

Sivakumar, S.

S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, "Bright white light through up-conversion of a single NIR source from sol-gel-derived thin film made with Ln3+-doped LaF3 nanoparticles," J. Am. Chem. Soc. 127, 12464-12465 (2005).
[CrossRef] [PubMed]

Spoonhower, J. P.

D. P. Poulios, J. P. Spoonhower, and N. P. Bigelow, "Influence of oxygen deficiencies and hydrogen-loading on defect luminescence in irradiated Ge-doped silica glasses," J. Lumin. 101, 23-33 (2003).
[CrossRef]

Stevels, J. M.

J. M. Stevels, "Ultraviolet transmittivity of glasses," Proceedings 11th International CongressPure and Applied Chemistry. 5, 519-521 (1953).

Szuromi, P.

P. Szuromi and D. Clery, "Control and use of defects in materials," Science. 281, 939-940 (1998).
[CrossRef]

Takahashi, K.

K. Takahashi, J. Miyahara, and Y. Shibahara, "Photostimulated luminescence (PSL) and color centers in BaFX:Eu2+ (X = Cl, Br, I) phosphors," J. Electrochem. Soc. 132, 1492-1494 (1985).
[CrossRef]

van Veggel, F. C. J. M.

S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, "Bright white light through up-conversion of a single NIR source from sol-gel-derived thin film made with Ln3+-doped LaF3 nanoparticles," J. Am. Chem. Soc. 127, 12464-12465 (2005).
[CrossRef] [PubMed]

Wang, J. S.

M. C. Wang, J. S. Wang, and M. H. Hon, "Effect of Na2O addition on the optical properties and chemical durability of Li2O-CaO-Al2O3-GeO2 glass," Jpn. J. Appl. Phys. 33, 2651-2655 (1994).
[CrossRef]

Wang, M. C.

M. C. Wang, J. S. Wang, and M. H. Hon, "Effect of Na2O addition on the optical properties and chemical durability of Li2O-CaO-Al2O3-GeO2 glass," Jpn. J. Appl. Phys. 33, 2651-2655 (1994).
[CrossRef]

Watanabe, T.

M. Fujimaki, T. Watanabe, T. Katoh, T. Kasahara, N. Miyazaki, Y. Ohki, and H. Nishikawa, "Structures and generation mechanisms of paramagnetic centers and absorption bands responsible for Ge-doped SiO2 optical-fiber gratings," Phys. Rev. B 60, 4682-4687 (1999).
[CrossRef]

Xu, W.

L. Huang, X. Liu, W. Xu, B. Chen, and J. Lin, "Infrared and visible luminescence properties of Er3+ and Yb3+ ions codoped Ca3Al2Ge3O12 glass under 978 nm diode laser excitation," J. Appl. Phys. 90, 5550-5553 (2001).
[CrossRef]

Yablonovitch, E.

E. Yablonovitch, "Inhibited Spontaneous Emission in Solid-State Physics and Electronics," Phys. Rev. Lett. 58, 2059-2062 (1987).
[CrossRef] [PubMed]

Yamane, M.

M. Kohketsu, K. Awazu, H. Kawazoe and M. Yamane, "Photoluminescence in VAD SiO2:GeO2 glasses sintered under reducing or oxidizing conditions," Jpn. J. Appl. Phys. 28, 622-631 (1989).
[CrossRef]

Appl. Phys. Lett.

K. O. Hill, Y. Fujii, D. C. Johnson, and B. Kawasaki, "Bragg gratings fabricated in monomode photo-sensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett. 32, 647-649 (1978).
[CrossRef]

J. Qiu, Y. Shimizugawa, Y. Iwabuchi, and K. Hirao, "Photostimulated luminescence of Ce3+ doped alkali borate glasses," Appl. Phys. Lett. 71, 43-45 (1997).
[CrossRef]

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Figures (7)

Fig. 1.
Fig. 1.

Absorption spectra of CaO-Al2O3-SiO2 glasses. a, b, c, d, e, and f are absorption spectra of glass samples A, B, C, D, E, and F, respectively.

Fig. 2.
Fig. 2.

ESR spectra of CaO-Al2O3-GeO2 glasses, (a): sample A; (b): sample D; (c): sample F.

Fig. 3.
Fig. 3.

Photographs of the emission states of glass samples when excited by UV lights, a, b, c, d, e, and f are glass samples A, B, C, D, E and F, respectively. The excitation wavelengths for blue, white, and red emissions are 300, 335 and 370nm, respectively.

Fig. 4.
Fig. 4.

Photoluminescence (right) and excitation (left) spectra of glass samples, a, b, c, d, e and f are referred to glass samples A, B, C, D, E, and F, respectively. The excitation wavelengths of A, B, and C are 300, 335 and 370nm, respectively.

Fig. 5.
Fig. 5.

Time-resolved PL spectra of sample F, excitation wavelengths are 300, 335 and 370 nm, respectively.

Fig. 6.
Fig. 6.

Schematic of energy level diagram of Ge-related oxygen defects and transitions involved in the photoluminescence experiment.

Fig. 7.
Fig. 7.

(a). Photoluminescence spectra of sample F excited by different wavelengths of UV light, which indicates that the luminescence is tunable. (b) CIE chromaticity diagram with coordinates (black circles) shows that the emissions could tunable from blue to white and to red.

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