Abstract

High efficiency phosphor-converted white light-emitting diodes with superior color uniformity have been investigated. It is proposed that the cymbal-shaped phosphor structure can improve the uniformity of the angle-dependent correlated color temperature (CCT) and also increase the luminous intensity compared to the conventional dispensing phosphor structure. In this experiment, we form the cymbal-shaped structure, which features a bump upon the central surface of the bottom layer, by employing an injection process after the dispensing coating. The upper bump phosphor layer not only enhances the extraction efficiency of lights, but also compensates the difference of the excitation optical path in the dispensing bottom layer between the normal-concentrated forward-scattered blue rays and those emitted with larger angles. This considerably eliminates the “blue center” phenomenon. The CCT deviation have been reduced from 315 K to 120 K using the cymbal-shaped phosphor coating method, and the light extraction efficiency (LEE) is enhanced by 8.5% compared with conventional dispensing phosphor-converted white LEDs. This new cymbal-shaped design was verified both experimentally and theoretically.

© 2015 Optical Society of America

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References

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  1. M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
    [Crossref]
  2. M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
    [Crossref]
  3. H. C. Kuo, C. W. Hung, H. C. Chen, K. J. Chen, C. H. Wang, C. W. Sher, C. C. Yeh, C. C. Lin, C. H. Chen, and Y. J. Cheng, “Patterned structure of remote phosphor for phosphor-converted white LEDs,” Opt. Express 19(S4Suppl 4), A930–A936 (2011).
    [Crossref] [PubMed]
  4. C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
    [Crossref]
  5. R. Hu, X. Luo, H. Zheng, Z. Qin, Z. Gan, B. Wu, and S. Liu, “Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating,” Opt. Express 20(13), 13727–13737 (2012).
    [Crossref] [PubMed]
  6. R. Hu, X. B. Luo, and S. Liu, “Study on the optical properties of conformal coating light-emitting diode by Monte Carlo simulation,” IEEE Photonics Technol. Lett. 23(22), 1673–1675 (2011).
    [Crossref]
  7. C. C. Sun, C. Y. Chen, C. C. Chen, C. Y. Chiu, Y. N. Peng, Y. H. Wang, T. H. Yang, T. Y. Chung, and C. Y. Chung, “High uniformity in angular correlated-color-temperature distribution of white LEDs from 2800K to 6500K,” Opt. Express 20(6), 6622–6630 (2012).
    [Crossref] [PubMed]
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    [Crossref]
  9. H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
    [Crossref]
  10. C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
    [Crossref]
  11. J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
    [Crossref]

2013 (3)

H. Zheng, X. B. Luo, and S. Liu, “Enhancing angular color uniformity of phosphor-converted white light-emitting diodes by phosphor dip-transfer coating,” J. Lightwave Technol. 31(12), 1987–1993 (2013).
[Crossref]

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

2012 (2)

2011 (2)

R. Hu, X. B. Luo, and S. Liu, “Study on the optical properties of conformal coating light-emitting diode by Monte Carlo simulation,” IEEE Photonics Technol. Lett. 23(22), 1673–1675 (2011).
[Crossref]

H. C. Kuo, C. W. Hung, H. C. Chen, K. J. Chen, C. H. Wang, C. W. Sher, C. C. Yeh, C. C. Lin, C. H. Chen, and Y. J. Cheng, “Patterned structure of remote phosphor for phosphor-converted white LEDs,” Opt. Express 19(S4Suppl 4), A930–A936 (2011).
[Crossref] [PubMed]

2010 (1)

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

2008 (1)

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

2007 (1)

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

2002 (1)

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Bhat, J.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Chen, C. C.

Chen, C. H.

Chen, C. Y.

Chen, H. C.

Chen, K. J.

Cheng, Y. J.

Chiu, C. Y.

Chung, C. Y.

Chung, T. Y.

Collins, D.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Craford, M. G.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

Gan, Z.

Gardner, N. F.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Gotz, W.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Harbers, G.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

Hartmann, P.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Hu, R.

R. Hu, X. Luo, H. Zheng, Z. Qin, Z. Gan, B. Wu, and S. Liu, “Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating,” Opt. Express 20(13), 13727–13737 (2012).
[Crossref] [PubMed]

R. Hu, X. B. Luo, and S. Liu, “Study on the optical properties of conformal coating light-emitting diode by Monte Carlo simulation,” IEEE Photonics Technol. Lett. 23(22), 1673–1675 (2011).
[Crossref]

Hung, C. W.

Krames, M. R.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Krenn, J. R.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Kuna, L.

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Kuo, H. C.

Lei, Q. L.

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

Liao, J. Y.

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

Lin, C. C.

Liu, S.

Lowery, C. H.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Ludowise, M.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Luo, X.

Luo, X. B.

H. Zheng, X. B. Luo, and S. Liu, “Enhancing angular color uniformity of phosphor-converted white light-emitting diodes by phosphor dip-transfer coating,” J. Lightwave Technol. 31(12), 1987–1993 (2013).
[Crossref]

R. Hu, X. B. Luo, and S. Liu, “Study on the optical properties of conformal coating light-emitting diode by Monte Carlo simulation,” IEEE Photonics Technol. Lett. 23(22), 1673–1675 (2011).
[Crossref]

Martin, P. S.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Mueller, G.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Mueller, G. O.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

Mueller-Mach, R.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Pachler, P.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Peng, Y. N.

Qin, Z.

Rao, H. B.

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

Reil, F.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

Rudaz, S.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Schweighart, M.

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Shchekin, O. B.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
[Crossref]

Sher, C. W.

Sommer, C.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Steigerwald, D. A.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Stockman, S. A.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Sun, C. C.

Tasch, S.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Wan, X. L.

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

Wang, C. H.

Wang, W.

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

Wang, X. M.

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

Wang, Y. H.

Wenzl, F. P.

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

Wierer, J. J.

M. R. Krames, J. Bhat, D. Collins, N. F. Gardner, W. Gotz, C. H. Lowery, M. Ludowise, P. S. Martin, G. Mueller, R. Mueller-Mach, S. Rudaz, D. A. Steigerwald, S. A. Stockman, and J. J. Wierer, “High-power III-Nitride emitters for solid-state lighting,” Phys, Stat. Sol. 192(2), 237–245 (2002).
[Crossref]

Wu, B.

Yang, T. H.

Yeh, C. C.

Zheng, H.

Zhou, D.

J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
[Crossref]

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

Zhou, L.

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
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H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
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C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
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J. Y. Liao, H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, X. M. Wang, D. Zhou, and Q. L. Lei, “Optical simulation of phosphor layer of white LEDs,” Chin. J. Semicon. 34(5), 053008 (2013).
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[Crossref]

J. Disp. Technol. (2)

H. B. Rao, W. Wang, X. L. Wan, L. S. Zhou, J. Y. Liao, D. Zhou, Q. L. Lei, and X. M. Wang, “An improved slurry method of self-adaptive phosphor coating for white pc-LED packaging,” J. Disp. Technol. 9(6), 453–458 (2013).
[Crossref]

M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol. 3(2), 160–175 (2007).
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C. Sommer, F. P. Wenzl, L. Kuna, E. Zinterl, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, and S. Tasch, “Predicting solutions towards improved high power white LED light sources-a combined theoretical and experimental study,” Proc. SPIE 7103, 710309 (2008).
[Crossref]

C. Sommer, F. P. Wenzl, F. Reil, J. R. Krenn, P. Pachler, S. Tasch, and P. Hartmann, “A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes,” Proc. SPIE 7784, 77840D (2010).
[Crossref]

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Figures (7)

Fig. 1
Fig. 1 Schematic diagrams of two phosphor distribution models, (a) the conventional dispensing phosphor structure, having a slightly curved convex surface over the opening of cup reflector; (b) the cymbal-shaped phosphor structure, a bump layer protruding out of the central surface of the dispensing bottom layer. Parameters that affect the angle-dependent CCT are the surface curvature of two structures, the height h and the angle α with z axis in the cymbal-shaped structure.
Fig. 2
Fig. 2 The overlook (left) and side view (right) of two phosphor distribution samples: (a) the conventional dispensing phosphor structure, which shows a convex surface over the opening of cup reflector; (b) the cymbal-shaped phosphor structure, where a bump layer protruded out of the central surface of the dispensing bottom layer.
Fig. 3
Fig. 3 The angle-dependent correlated color temperature of two phosphor distribution structures.
Fig. 4
Fig. 4 The spectral power distribution of the radiation of the pc-WLEDs with two phosphor structures.
Fig. 5
Fig. 5 The current-dependent luminous flux and luminous efficacy of the pc-WLEDs with the conventional dispensing phosphor and the cymbal-shaped phosphor structures.
Fig. 6
Fig. 6 The luminous intensity distribution of the pc-WLEDs with the conventional dispensing phosphor and the cymbal-shaped phosphor structures.
Fig. 7
Fig. 7 The ray tracing simulation results: the angle-dependent intensity ratio of yellow to blue rays at a CCT of 4800 K. The conventional dispensing phosphor structure has serious ratio deviation in angles more than 50 degrees. However the cymbal-shaped phosphor structure keeps high consistency even at angles up to 70 degrees.

Tables (1)

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Table 1 Angle-dependent CCT deviation (ΔCCT) of two phosphor structures

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