Abstract

A yellow-emitting Tb3Al5O12:Ce3+ (TAG:Ce) phosphor was coated on blue light-emitting diodes (LEDs) to obtain white LEDs (WLEDs). Since TAG:Ce showed 90% of the brightness of Y3Al5O12:Ce3+ (YAG:Ce), it was expected that TAG:Ce-based WLEDs showed 90% of brightness of YAG:Ce-based ones. However, the TAG:Ce-based WLED showed 74% of the brightness of YAG:Ce-based one. Considering the density and size of the phosphors, the higher density and larger size of TAG:Ce induced a great deal of sedimentation of TAG:Ce particles in an epoxy resin. It is believed that this is one of main reasons for the reduced optical power of the TAG:Ce-based WLED compared to that of the WLED expected from the brightness of TAG:Ce.

© 2008 Optical Society of America

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[CrossRef]

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

H. S. Jang and D. Y. Jeon, Opt. Lett. 32, 3444 (2007).
[CrossRef] [PubMed]

2006 (1)

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

2005 (1)

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

2004 (1)

2003 (1)

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
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2002 (1)

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Arik, M.

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Becker, C.

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Cho, J.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
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Hirosaki, N.

Hsing, M.

M. Arik, S. Weaver, C. Becker, M. Hsing, and A. Srivastava, Proceedings of American Society of Mechanical Engineers International Electronic Packaging Technical Conference and Exhibition (American Society of Mechanical Engineers, 2003), InterPack2003-35015.
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Im, W. B.

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
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Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

Izuno, K.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Jang, H. S.

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

H. S. Jang and D. Y. Jeon, Appl. Phys. Lett. 90, 041906 (2007).
[CrossRef]

H. S. Jang and D. Y. Jeon, Opt. Lett. 32, 3444 (2007).
[CrossRef] [PubMed]

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

Jeon, D. Y.

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

H. S. Jang and D. Y. Jeon, Opt. Lett. 32, 3444 (2007).
[CrossRef] [PubMed]

H. S. Jang and D. Y. Jeon, Appl. Phys. Lett. 90, 041906 (2007).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

Kameshima, M.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Kang, J. H.

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

Kim, J. K.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Kim, S. S.

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

Kimura, N.

Krames, M. R.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, IEEE J. Sel. Top. Quantum Electron. 8, 339 (2002).
[CrossRef]

Lee, D. C.

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

Lee, J. S.

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

Lee, S.

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

Luo, H.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Mueller, G. O.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, IEEE J. Sel. Top. Quantum Electron. 8, 339 (2002).
[CrossRef]

Mueller-Mach, R.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, IEEE J. Sel. Top. Quantum Electron. 8, 339 (2002).
[CrossRef]

Mukai, T.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Murazaki, Y.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Naitou, T.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Ohashi, M.

Omichi, K.

Park, Y.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Sakuma, K.

Schubert, E. F.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Sone, C.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Srivastava, A.

M. Arik, S. Weaver, C. Becker, M. Hsing, and A. Srivastava, Proceedings of American Society of Mechanical Engineers International Electronic Packaging Technical Conference and Exhibition (American Society of Mechanical Engineers, 2003), InterPack2003-35015.
[PubMed]

Suehiro, T.

Tamaki, H.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Tanaka, D.

Trottier, T.

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, IEEE J. Sel. Top. Quantum Electron. 8, 339 (2002).
[CrossRef]

Weaver, S.

M. Arik, S. Weaver, C. Becker, M. Hsing, and A. Srivastava, Proceedings of American Society of Mechanical Engineers International Electronic Packaging Technical Conference and Exhibition (American Society of Mechanical Engineers, 2003), InterPack2003-35015.
[PubMed]

Won, Y.-H.

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

Xie, R.-J.

Yamada, M.

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Yamamoto, Y.

Appl. Phys. Lett. (4)

H. S. Jang and D. Y. Jeon, Appl. Phys. Lett. 90, 041906 (2007).
[CrossRef]

Y.-H. Won, H. S. Jang, W. B. Im, J. S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 89, 231909 (2006).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, S. Lee, and D. Y. Jeon, Appl. Phys. Lett. 90, 071908 (2007).
[CrossRef]

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

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

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, IEEE J. Sel. Top. Quantum Electron. 8, 339 (2002).
[CrossRef]

J. Lumin. (1)

H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, J. Lumin. 126, 371 (2007).
[CrossRef]

Jpn. J. Appl. Phys. (1)

M. Yamada, T. Naitou, K. Izuno, H. Tamaki, Y. Murazaki, M. Kameshima, and T. Mukai, Jpn. J. Appl. Phys. 42, L20 (2003).
[CrossRef]

Opt. Lett. (2)

Other (2)

http://en.wikipedia.org/wiki/Buoyancy.

M. Arik, S. Weaver, C. Becker, M. Hsing, and A. Srivastava, Proceedings of American Society of Mechanical Engineers International Electronic Packaging Technical Conference and Exhibition (American Society of Mechanical Engineers, 2003), InterPack2003-35015.
[PubMed]

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Figures (4)

Fig. 1
Fig. 1

Schematic diagrams of particle distribution in transparent resin: (a) dispersed distribution, (b) local distribution, (c) remote distribution.

Fig. 2
Fig. 2

(a) PL spectra of TAG:Ce and YAG:Ce and (b) EL spectra of TAG-WLED and YAG-WLED.

Fig. 3
Fig. 3

Cross-sectional SEM images of (a) TAG-WLED and (b) YAG-WLED.

Fig. 4
Fig. 4

Sedimentation profiles ( Δ T and Δ BS ) of (a) TAG:Ce and (b) YAG:Ce in the epoxy.

Tables (1)

Tables Icon

Table 1 Physical Properties of TAG:Ce and YAG:Ce

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

F Buo = ρ E V g ,
F T = M T g + F T Buo = ρ T V T g ρ E V T g = ( ρ T ρ E ) V T g ,
F Y = M Y g + F Y Buo = ( ρ Y ρ E ) V Y g .

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