Abstract

High-power white light-emitting diodes (LEDs) are fabricated by combining blue LEDs and green (Ba,Sr)2SiO4:Eu2+ and red CaAlSiN3:Eu2+ phosphors with varying phosphor geometry. The white LED having separated the phosphor layer by the silicone gel layer between green and red phosphor layers shows superior optical properties. The luminous efficiency (ηL) is improved by a decrease of reabsorption of green light by red phosphor owing to a difference among refractive indices. The white LED shows very high ηL of 51lmW and a high color rendering index of 95 under 350mA. In addition, improved luminous properties of the white LED including a separated phosphor layer are confirmed via ray-trace simulation.

© 2008 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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2008 (2)

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, K.-M. Chu, and D. Y. Jeon, Opt. Lett. 33, 2140 (2008).
[CrossRef] [PubMed]

2007 (4)

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]

N. Kimura, K. Sakuma, S. Hirafune, K. Asano, N. Hirosaki, and R.-J. Xie, Appl. Phys. Lett. 90, 051109 (2007).
[CrossRef]

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

2006 (3)

D.-Y. Kang, E. Wu, and D.-M. Wang, Appl. Phys. Lett. 89, 231102 (2006).
[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. K. Cho, J. Jang, J.-H. Choi, J. Choi, B. Lee, Y. H. Choe, K.-D. Lee, S. H. Kim, K. Lee, S.-K. Kim, and Y.-H. Lee, Opt. Express 14, 8654 (2006).
[CrossRef] [PubMed]

2005 (2)

A. Borbely and S. G. Johnson, Opt. Eng. 44, 111308 (2005).
[CrossRef]

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

2004 (1)

1993 (1)

S. Nakamura, M. Senoh, and T. Mukai, Appl. Phys. Lett. 62, 2390 (1993).
[CrossRef]

1965 (1)

W. Heller, J. Chem. Phys. 69, 1123 (1965).
[CrossRef]

1962 (1)

R. G. Grebenshchikov and N. A. Toropov, Russ. Chem. Bull. 4, 545 (1962).

Asano, K.

N. Kimura, K. Sakuma, S. Hirafune, K. Asano, N. Hirosaki, and R.-J. Xie, Appl. Phys. Lett. 90, 051109 (2007).
[CrossRef]

Blasse, G.

G. Blasse and B. C. Grabmaier, Luminescent Materials (Springer-Verlag, 1994).
[CrossRef]

Borbely, A.

A. Borbely and S. G. Johnson, Opt. Eng. 44, 111308 (2005).
[CrossRef]

Cho, H. K.

Choe, Y. H.

Choi, J.

Choi, J.-H.

Chu, K.-M.

Freyssinier-Nova, J. P.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

Grabmaier, B. C.

G. Blasse and B. C. Grabmaier, Luminescent Materials (Springer-Verlag, 1994).
[CrossRef]

Grebenshchikov, R. G.

R. G. Grebenshchikov and N. A. Toropov, Russ. Chem. Bull. 4, 545 (1962).

Gu, Y.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

Han, J. Y.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

Hanzawa, H.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Heller, W.

W. Heller, J. Chem. Phys. 69, 1123 (1965).
[CrossRef]

Hirafune, S.

N. Kimura, K. Sakuma, S. Hirafune, K. Asano, N. Hirosaki, and R.-J. Xie, Appl. Phys. Lett. 90, 051109 (2007).
[CrossRef]

Hirosaki, N.

Horikawa, T.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Huh, H.

Y. S. Kim, H. Huh, G. H. Kim, and Y.-H. Won, “Lens, a method for manufacturing it and light emitting package device,” Korean patent 0774218 (November 1, 2007).

Im, W. B.

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

Jang, H. S.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, K.-M. Chu, and D. Y. Jeon, Opt. Lett. 33, 2140 (2008).
[CrossRef] [PubMed]

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]

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

Jang, J.

Jeon, D. Y.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

H. S. Jang, J. H. Kang, Y.-H. Won, K.-M. Chu, and D. Y. Jeon, Opt. Lett. 33, 2140 (2008).
[CrossRef] [PubMed]

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]

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

Johnson, S. G.

A. Borbely and S. G. Johnson, Opt. Eng. 44, 111308 (2005).
[CrossRef]

Kang, D.-Y.

D.-Y. Kang, E. Wu, and D.-M. Wang, Appl. Phys. Lett. 89, 231102 (2006).
[CrossRef]

Kang, J. H.

Kijima, N.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Kim, G. H.

Y. S. Kim, H. Huh, G. H. Kim, and Y.-H. Won, “Lens, a method for manufacturing it and light emitting package device,” Korean patent 0774218 (November 1, 2007).

Kim, S. H.

Kim, S. W.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

Kim, S.-K.

Kim, Y. S.

Y. S. Kim, H. Huh, G. H. Kim, and Y.-H. Won, “Lens, a method for manufacturing it and light emitting package device,” Korean patent 0774218 (November 1, 2007).

Kimura, N.

Lee, B.

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, K.

Lee, K.-D.

Lee, S.-G.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

Lee, Y.-H.

Lim, T. Y.

T. Y. Lim, 2007 LED packaging, Shanghai, China (2007).

Machida, K.-I.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Mukai, T.

S. Nakamura, M. Senoh, and T. Mukai, Appl. Phys. Lett. 62, 2390 (1993).
[CrossRef]

Nakamura, S.

S. Nakamura, M. Senoh, and T. Mukai, Appl. Phys. Lett. 62, 2390 (1993).
[CrossRef]

Narendran, N.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

Ohashi, M.

Omichi, K.

Piao, X.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Sakuma, K.

Senoh, M.

S. Nakamura, M. Senoh, and T. Mukai, Appl. Phys. Lett. 62, 2390 (1993).
[CrossRef]

Shimomura, Y.

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

Suehiro, T.

Tanaka, D.

Toropov, N. A.

R. G. Grebenshchikov and N. A. Toropov, Russ. Chem. Bull. 4, 545 (1962).

Wang, D.-M.

D.-Y. Kang, E. Wu, and D.-M. Wang, Appl. Phys. Lett. 89, 231102 (2006).
[CrossRef]

Won, Y.-H.

H. S. Jang, J. H. Kang, Y.-H. Won, K.-M. Chu, and D. Y. Jeon, Opt. Lett. 33, 2140 (2008).
[CrossRef] [PubMed]

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

Y. S. Kim, H. Huh, G. H. Kim, and Y.-H. Won, “Lens, a method for manufacturing it and light emitting package device,” Korean patent 0774218 (November 1, 2007).

Wu, E.

D.-Y. Kang, E. Wu, and D.-M. Wang, Appl. Phys. Lett. 89, 231102 (2006).
[CrossRef]

Xie, R.-J.

Yamamoto, Y.

Yang, H.

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

Zhu, Y.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

Adv. Mater. (Weinheim, Ger.) (1)

H. S. Jang, H. Yang, S. W. Kim, J. Y. Han, S.-G. Lee, and D. Y. Jeon, Adv. Mater. (Weinheim, Ger.) 20, 2696 (2008).
[CrossRef]

Appl. Phys. Lett. (5)

N. Kimura, K. Sakuma, S. Hirafune, K. Asano, N. Hirosaki, and R.-J. Xie, Appl. Phys. Lett. 90, 051109 (2007).
[CrossRef]

S. Nakamura, M. Senoh, and T. Mukai, Appl. Phys. Lett. 62, 2390 (1993).
[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 and D. Y. Jeon, Appl. Phys. Lett. 90, 041906 (2007).
[CrossRef]

D.-Y. Kang, E. Wu, and D.-M. Wang, Appl. Phys. Lett. 89, 231102 (2006).
[CrossRef]

Chem. Mater. (1)

X. Piao, K.-I. Machida, T. Horikawa, H. Hanzawa, Y. Shimomura, and N. Kijima, Chem. Mater. 19, 4592 (2007).
[CrossRef]

J. Chem. Phys. (1)

W. Heller, J. Chem. Phys. 69, 1123 (1965).
[CrossRef]

Opt. Eng. (1)

A. Borbely and S. G. Johnson, Opt. Eng. 44, 111308 (2005).
[CrossRef]

Opt. Express (1)

Opt. Lett. (3)

Phys. Status Solidi A (1)

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, Phys. Status Solidi A 202, R60 (2005).
[CrossRef]

Russ. Chem. Bull. (1)

R. G. Grebenshchikov and N. A. Toropov, Russ. Chem. Bull. 4, 545 (1962).

Other (4)

T. Y. Lim, 2007 LED packaging, Shanghai, China (2007).

http://en.wikipedia.org/wiki/Snell's_law.

G. Blasse and B. C. Grabmaier, Luminescent Materials (Springer-Verlag, 1994).
[CrossRef]

Y. S. Kim, H. Huh, G. H. Kim, and Y.-H. Won, “Lens, a method for manufacturing it and light emitting package device,” Korean patent 0774218 (November 1, 2007).

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Figures (4)

Fig. 1
Fig. 1

EL spectra of yellow phosphor coated with blue LED, green–orange phosphors coated with blue LED, and green–red phosphors coated with blue LED at 350 mA .

Fig. 2
Fig. 2

PLE and PL spectra of green [ ( Ba , Sr ) 2 Si O 4 : Eu 2 + ] and red ( Ca Al Si N 3 : Eu 2 + ) phosphors.

Fig. 3
Fig. 3

(a), (b) Schematics of phosphor coating position. (c), (d) SEM images of cross section of phosphor coating position. (e)–(g) EDS mapping data of (d) parts of the Ba ion of green phosphor and Ca ion of red phosphor.

Fig. 4
Fig. 4

(a) Solid model of a simulated package and (b) EL spectra of simulated white LEDs.

Equations (2)

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RI = ν 1 RI 1 + ν 2 RI 2 ,
n 1 sin θ 1 = n 2 sin θ 2 .

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