Abstract

A phosphor-converted light emitting diode with curved remote phosphor layer was obtained in this study. By changing the geometry of the flat remote phosphor layer in a conventional remote phosphor structure, the package extraction efficiency and luminous efficacy of the curved remote phosphor structure was improved by reducing the total internal reflection at the interface of the air and phosphor layer. Ray tracing simulations were performed to analyze the package extraction efficiency of the curved remote phosphor structure. Experimental results showed that the convex remote phosphor structure had high luminous efficacy with high color uniformity. The convex remote phosphor structure would be a suitable structure if the remote phosphor structure is used in lighting applications.

© 2014 Optical Society of America

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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. Display Technol. 3, 160–175 (2007).
    [CrossRef]
  2. N. Narendran, “Improved performance white LED,” Proc. SPIE 5941, 594108 (2005).
    [CrossRef]
  3. J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
    [CrossRef]
  4. N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
    [CrossRef]
  5. H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
    [CrossRef]
  6. S. C. Allen and A. J. Steckl, “ELiXIR—Solid-state luminaire with enhanced light extraction by internal reflection,” J. Display Technol. 3, 155–159 (2007).
    [CrossRef]
  7. S. C. Allen and A. J. Steckl, “A nearly ideal phosphor-converted white light-emitting diode,” Appl. Phys. Lett. 92, 143309 (2008).
    [CrossRef]
  8. H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
    [CrossRef]
  9. 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, A930–A936 (2011).
    [CrossRef]
  10. M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
    [CrossRef]
  11. M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
    [CrossRef]

2012 (1)

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[CrossRef]

2011 (1)

2010 (2)

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

2008 (1)

S. C. Allen and A. J. Steckl, “A nearly ideal phosphor-converted white light-emitting diode,” Appl. Phys. Lett. 92, 143309 (2008).
[CrossRef]

2007 (2)

2005 (4)

N. Narendran, “Improved performance white LED,” Proc. SPIE 5941, 594108 (2005).
[CrossRef]

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Allen, S. C.

S. C. Allen and A. J. Steckl, “A nearly ideal phosphor-converted white light-emitting diode,” Appl. Phys. Lett. 92, 143309 (2008).
[CrossRef]

S. C. Allen and A. J. Steckl, “ELiXIR—Solid-state luminaire with enhanced light extraction by internal reflection,” J. Display Technol. 3, 155–159 (2007).
[CrossRef]

Chen, C. H.

Chen, H. C.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Chen, J. C.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Chen, K. J.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Cheng, Y. J.

Cho, J.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

Craford, M. G.

Freyssinier-Nova, J. P.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

Gu, Y.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

Harbers, G.

Hung, C. W.

Kim, J. K.

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Krames, M. R.

Kuo, H. C.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Lin, C. C.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Lin, M. T.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Lin, M. Y.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

Liu, C. H.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Luo, H.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

Mueller, G. O.

Mueller-Mach, R.

Narendran, N.

N. Narendran, “Improved performance white LED,” Proc. SPIE 5941, 594108 (2005).
[CrossRef]

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

Park, Y.

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Schubert, E. F.

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

Shchekin, O. B.

Sher, C. W.

Shih, M. H.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[CrossRef]

Sone, C.

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

Steckl, A. J.

S. C. Allen and A. J. Steckl, “A nearly ideal phosphor-converted white light-emitting diode,” Appl. Phys. Lett. 92, 143309 (2008).
[CrossRef]

S. C. Allen and A. J. Steckl, “ELiXIR—Solid-state luminaire with enhanced light extraction by internal reflection,” J. Display Technol. 3, 155–159 (2007).
[CrossRef]

Sun, C. C.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

Tai, K. Y.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

Tai, S. C.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Tsai, H. H.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[CrossRef]

Wang, C. H.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Yeh, C. C.

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[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, A930–A936 (2011).
[CrossRef]

Ying, S. P.

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Zhou, L.

Zhu, Y.

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

Appl. Phys. Lett. (2)

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Analysis of high-power packages for phosphor-based white-light-emitting diodes,” Appl. Phys. Lett. 86, 243505 (2005).
[CrossRef]

S. C. Allen and A. J. Steckl, “A nearly ideal phosphor-converted white light-emitting diode,” Appl. Phys. Lett. 92, 143309 (2008).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Ring remote phosphor structure for phosphor-converted white LEDs,” IEEE Photon. Technol. Lett. 22, 574–576 (2010).
[CrossRef]

J. Display Technol. (2)

Jpn. J. Appl. Phys. (2)

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. Park, “Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup,” Jpn. J. Appl. Phys. 44, L649–L651 (2005).
[CrossRef]

M. T. Lin, S. P. Ying, M. Y. Lin, K. Y. Tai, S. C. Tai, C. H. Liu, J. C. Chen, and C. C. Sun, “Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes,” Jpn. J. Appl. Phys. 49, 072101 (2010).
[CrossRef]

Microelectron. Reliab. (1)

H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, and H. C. Kuo, “Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package,” Microelectron. Reliab. 52, 933–936 (2012).
[CrossRef]

Opt. Express (1)

Phys. Status Solidi (1)

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi 202, R60–R62 (2005).
[CrossRef]

Proc. SPIE (1)

N. Narendran, “Improved performance white LED,” Proc. SPIE 5941, 594108 (2005).
[CrossRef]

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Figures (6)

Fig. 1.
Fig. 1.

Schematic cross sectional view of the pcLED with (a) convex remote phosphor structure, (b) flat remote phosphor structure, and (c) concave remote phosphor structure.

Fig. 2.
Fig. 2.

Ray trace diagram of the convex and flat remote phosphor layers.

Fig. 3.
Fig. 3.

Package extraction efficiencies of the curved remote phosphor structures with different curvatures of curved remote phosphor layer.

Fig. 4.
Fig. 4.

Angular YBR distribution of the curved remote phosphor structure with different radius of curved remote phosphor layer.

Fig. 5.
Fig. 5.

Photographs of curved remote phosphor structure devices with remote phosphor layer of (a) R=10.81mm, (b) R=21.25mm, (c) R=0mm, (d) R=5.78mm, and (e) R=4.27mm.

Fig. 6.
Fig. 6.

(a) Angular CCT distribution, and (b) CCT deviations of the curved remote phosphor structure devices with different radius of curved remote phosphor layer.

Equations (3)

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

δθc=sin1(1ne).
δ=θcθ=θcsin1(LR),
Surface curvature(C)=1/R(mm1).

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