Abstract

High efficiency white light-emitting diodes with superior color-mixing have been investigated. It is suggested that the patterned remote phosphor structure could improve the uniformity of angular-dependent correlated color temperature (CCT) and achieve high chromatic stability in wider operating current range, as compared to the conventional remote phosphor coating structure. In this experiment, we employed a pulse spray coating method to place the patterned phosphor on the package and to leave a window region. The window area, a clear space without coating of the phosphor not only increases the extraction efficiency of blue rays at large angle, but also improves the stability of angular-dependent CCT. Moreover, the CCT deviation could be reduced from 1320 K to 266 K by this patterned remote phosphor method, and the stray blue/yellow light within the package can be effectively reduced and controlled. The design was verified both experimentally and theoretically.

© 2011 OSA

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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).
  2. N. Narendran, N. Maliyagoda, L. Deng, and R. Pysar, “Characterizing LEDs for general illumination applications: mixed-color and phosphor-based white sources,” Proc. SPIE4445, 137–147 (2001).
  3. T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett.82(22), 3817–3819 (2003).
  4. N. Narendran, “Improved performance white LED,” Proc. SPIE5941, 1–6 (2005).
  5. 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(8), 574–576 (2010).
  6. 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(7), 072101 (2010).
  7. B. F. Fan, H. Wu, Y. Zhao, Y. L. Xian, and G. Wang, “Study of phosphor thermal-isolated packaging technologies for high-power white light-emitting diodes,” IEEE Photon. Technol. Lett.19(15), 1121–1123 (2007).
  8. N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi202(6), 60–62 (2005) (a).
  9. 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(21), 649–651 (2005).
  10. Z. Y. Liu, S. Liu, K. Wang, and X. B. Luo, “Analysis of Factors Affecting Color Distribution of White LEDs,” 2008 International Conference on Electronic Packaging Technology & High Density Packaging, Vols 1 and 2, 386–393 (2008).
  11. Z. Liu, S. Liu, K. Wang, and X. Luo, “Optical Analysis of Color Distribution in White LEDs with Various Packaging Methods,” IEEE Photon. Technol. Lett.20(24), 2027–2029 (2008).
  12. H. T. Huang, C. C. Tsai, and Y. P. Huang, “Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs,” Opt. Express18(S2Suppl 2), A201–A206 (2010).
  13. S. Ye, F. Xiao, Y. X. Pan, Y. Y. Ma, and Q. Y. Zhang, “Phosphors in phosphor-converted white light-emitting diodes: Recent advances in material, techniques and properties,” Mater. Sci. Eng. Rep.71(1), 1–34 (2010).

Other (13)

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).

N. Narendran, N. Maliyagoda, L. Deng, and R. Pysar, “Characterizing LEDs for general illumination applications: mixed-color and phosphor-based white sources,” Proc. SPIE4445, 137–147 (2001).

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett.82(22), 3817–3819 (2003).

N. Narendran, “Improved performance white LED,” Proc. SPIE5941, 1–6 (2005).

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(8), 574–576 (2010).

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(7), 072101 (2010).

B. F. Fan, H. Wu, Y. Zhao, Y. L. Xian, and G. Wang, “Study of phosphor thermal-isolated packaging technologies for high-power white light-emitting diodes,” IEEE Photon. Technol. Lett.19(15), 1121–1123 (2007).

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. Zhu, “Extracting phosphor-scattered photons to improve white LED efficiency,” Phys. Status Solidi202(6), 60–62 (2005) (a).

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(21), 649–651 (2005).

Z. Y. Liu, S. Liu, K. Wang, and X. B. Luo, “Analysis of Factors Affecting Color Distribution of White LEDs,” 2008 International Conference on Electronic Packaging Technology & High Density Packaging, Vols 1 and 2, 386–393 (2008).

Z. Liu, S. Liu, K. Wang, and X. Luo, “Optical Analysis of Color Distribution in White LEDs with Various Packaging Methods,” IEEE Photon. Technol. Lett.20(24), 2027–2029 (2008).

H. T. Huang, C. C. Tsai, and Y. P. Huang, “Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs,” Opt. Express18(S2Suppl 2), A201–A206 (2010).

S. Ye, F. Xiao, Y. X. Pan, Y. Y. Ma, and Q. Y. Zhang, “Phosphors in phosphor-converted white light-emitting diodes: Recent advances in material, techniques and properties,” Mater. Sci. Eng. Rep.71(1), 1–34 (2010).

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