Abstract

White light output was realized through combining a cerium-doped yttrium aluminum garnet (YAG:${\hbox{Ce}}^{3+}$) phosphor with a gallium nitride (GaN)-based blue light-emitting diode (LED). In order to coat a phosphor layer of high quality on a GaN chip, the slurry coating technique was applied and investigated because of the coating efficiency and uniformity. The phosphor layer of conformal structure was realized on the LED chip with the self-exposure method. The influences of ammonium dichromate (ADC) as photosensitizer of photoresist in the slurry are discussed. Two methods are brought forward to reduce the absorption of Cr ions introduced by ADC. And experimental results indicate that these two methods are feasible to increase the luminous efficiency of white LEDs.

© 2009 IEEE

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  1. M. R. Krames, H. Amano, J. J. Brown, P. L. Heremans, "Introduction to the issue on high-efficiency light-emitting diodes," IEEE J. Sel. Topics Quantum Electron. 8, 185-188 (2002).
  2. N. Narendran, L. Deng, R. M. Pysar, Y. Gu, H. Yu, "Solid-state lighting: Failure analysis of white LEDs," SPIE Third Int. Conf. on Solid State Lighting (2004) pp. 267-275.
  3. E. F. Schubert, Light-Emitting Diodes (Cambridge Univ. Press, 2003) pp. 1-132.
  4. W. D. Collins, W. L. Snyder, D. A. Steigerwald, Producing self-aligned and self-exposed photoresist patterns on light emitting devices U.S. Patent 6 756 186 B2 (2004).
  5. S. Nakamura, "Present performance of InGaN based blue/green/yellow LEDs," SPIE 3, (2002).
  6. J.-H. Yum, S.-Y. Seo, S. Lee, Y.-E. Sung, "Comparison of ${\hbox{Y}}_{3}{\hbox{Al}}_{5}{\hbox{O}}_{12}$:${\hbox{Ce}}_{0.05}$ phosphor coating methods for white light emitting diode on gallium nitride," Proc. SPIE (2001).
  7. J.-H. Yum, S.-Y. Seo, S. Lee, Y.-E. Sung, "${\hbox{Y}}_{3}{\hbox{Al}}_{5}{\hbox{O}}_{12}$:${\hbox{Ce}}_{0.05}$ phosphor coatings on gallium nitride for white light emitting diodes," J. Electrochem. Soc. 150, H47-H52 (2003).
  8. B. Hou, H. Rao, J. Li, "Phosphor coating technique with slurry method in application of white LED," Proc. SPIE (2008) pp. 684106.

2003 (1)

J.-H. Yum, S.-Y. Seo, S. Lee, Y.-E. Sung, "${\hbox{Y}}_{3}{\hbox{Al}}_{5}{\hbox{O}}_{12}$:${\hbox{Ce}}_{0.05}$ phosphor coatings on gallium nitride for white light emitting diodes," J. Electrochem. Soc. 150, H47-H52 (2003).

2002 (2)

M. R. Krames, H. Amano, J. J. Brown, P. L. Heremans, "Introduction to the issue on high-efficiency light-emitting diodes," IEEE J. Sel. Topics Quantum Electron. 8, 185-188 (2002).

S. Nakamura, "Present performance of InGaN based blue/green/yellow LEDs," SPIE 3, (2002).

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

M. R. Krames, H. Amano, J. J. Brown, P. L. Heremans, "Introduction to the issue on high-efficiency light-emitting diodes," IEEE J. Sel. Topics Quantum Electron. 8, 185-188 (2002).

J. Electrochem. Soc. (1)

J.-H. Yum, S.-Y. Seo, S. Lee, Y.-E. Sung, "${\hbox{Y}}_{3}{\hbox{Al}}_{5}{\hbox{O}}_{12}$:${\hbox{Ce}}_{0.05}$ phosphor coatings on gallium nitride for white light emitting diodes," J. Electrochem. Soc. 150, H47-H52 (2003).

SPIE (1)

S. Nakamura, "Present performance of InGaN based blue/green/yellow LEDs," SPIE 3, (2002).

Other (5)

J.-H. Yum, S.-Y. Seo, S. Lee, Y.-E. Sung, "Comparison of ${\hbox{Y}}_{3}{\hbox{Al}}_{5}{\hbox{O}}_{12}$:${\hbox{Ce}}_{0.05}$ phosphor coating methods for white light emitting diode on gallium nitride," Proc. SPIE (2001).

B. Hou, H. Rao, J. Li, "Phosphor coating technique with slurry method in application of white LED," Proc. SPIE (2008) pp. 684106.

N. Narendran, L. Deng, R. M. Pysar, Y. Gu, H. Yu, "Solid-state lighting: Failure analysis of white LEDs," SPIE Third Int. Conf. on Solid State Lighting (2004) pp. 267-275.

E. F. Schubert, Light-Emitting Diodes (Cambridge Univ. Press, 2003) pp. 1-132.

W. D. Collins, W. L. Snyder, D. A. Steigerwald, Producing self-aligned and self-exposed photoresist patterns on light emitting devices U.S. Patent 6 756 186 B2 (2004).

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