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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 13 — Jun. 22, 2009
  • pp: 10806–10813

Improved color rendering and luminous efficacy in phosphor-converted white light-emitting diodes by use of dual-blue emitting active regions

Roya Mirhosseini, Martin F. Schubert, Sameer Chhajed, Jaehee Cho, Jong Kyu Kim, and E. Fred Schubert  »View Author Affiliations

Optics Express, Vol. 17, Issue 13, pp. 10806-10813 (2009)

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Conventional white-light sources suffer from a fundamental trade-off between color rendering index and the luminous efficacy; increasing one generally comes at the expense of the other. We demonstrate through simulation that dual-wavelength blue-emitting active regions in phosphor-converted white light sources maximize the output luminous flux while significantly increasing the color rendering ability. Our results indicate that such improvements can be achieved over a broad range of correlated color temperatures.

© 2009 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: April 1, 2009
Revised Manuscript: May 29, 2009
Manuscript Accepted: June 5, 2009
Published: June 12, 2009

Roya Mirhosseini, Martin F. Schubert, Sameer Chhajed, Jaehee Cho, Jong Kyu Kim, and E. Fred Schubert, "Improved color rendering and luminous efficacy in phosphor-converted white light-emitting diodes by use of dual-blue emitting active regions," Opt. Express 17, 10806-10813 (2009)

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  1. E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005). [CrossRef] [PubMed]
  2. A. Zukauskas, R. Vaicekauskas, F. Ivanauskas, R. Gaska, and M. S. Shur, “Optimization of white polychromatic semiconductor lamps,” Appl. Phys. Lett. 80(2), 234–237 (2002). [CrossRef]
  3. J. Tsao, “Solid-state lighting: lamps, chips and materials for tomorrow,” IEEE Circuits Devices Mag. 20(3), 28–37 (2004). [CrossRef]
  4. S. W. Brown, C. Santana, and G. P. Eppeldauer, “Development of a tunable LED-based colorimetric source,” J. Res. Natl. Inst. Stand. Technol. 107, 363–371 (2002).
  5. B. Damilano, N. Grandjean, C. Pernot, and J. Massies, “Monolithic white light emitting diodes based on InGaN/GaN multiple quantum wells,” Jpn. J. Appl. Phys. 40(Part 2, No. 9A/B), 918–920 (2001). [CrossRef]
  6. S. Chhajed, Y. Xi, Y. L. Li, T. Gessmann, and E. F. Schubert, “Influence of junction temperature on chromaticity and color-rendering properties of trichromatic white-light sources based on light-emitting diodes,” J. Appl. Phys. 97(5), 054506 (2005). [CrossRef]
  7. E. F. Schubert, Light Emitting Diodes (Cambridge University Press, Cambridge, U.K. 2003), Chap. 19–20.
  8. R. J. Xie and N. Hirosaki, “Review: Silicon-based oxynitrides and nitride phosphors for white LEDs,” Sci. Technol. Adv. Mater. 8(7-8), 588–600 (2007). [CrossRef]
  9. T. Mukai, Proceedings of SPIE Photonics West, San Jose, California, Jan. 29, 7216 (2009)
  10. R. Mueller-Mach, G. Mueller, M. R. Krames, H. A. Hoppe, F. Stadler, W. Schnick, T. Juestel, and P. Schmidt, “Highly efficient all-nitride phosphor-converted white light emitting diode,” Phys. Status Solidi A 202(9), 1727–1732 (2005). [CrossRef]
  11. S Nakamura, “Progress with GaN-based blue/green LEDs and bluish-purple semiconductor LDs,” Electron. Commun. Jpn. 81, 1–8 (1998). [CrossRef]
  12. M. Peter, A. Laubsch, P. Stauss, A. Walter, J. Baur, and B. Hahn, “Green ThinGaN power LED-demonstrates 100 lm,” Phys. Status Solidi C 5(6), 2050–2052 (2008). [CrossRef]
  13. M. Yamada, Y. Narukawa, and T. Mukai, “Phosphor free high-luminous-efficiency white light-emitting diodes composed of InGaN multi-quantum well,” Jpn. J. Appl. Phys. 41(Part 2, No. 3A), 246–248 (2002). [CrossRef]
  14. I. K. Park, J. Y. Kim, M. K. Kwon, C. Y. Cho, J. H. Lim, and S. J. Park, “Phosphor-free white light emitting diode with laterally distributed multiple quantum wells,” Appl. Phys. Lett. 92(9), 091110 (2008). [CrossRef]
  15. M. Grundmann and U. Mishra, “Multi-color light emitting diode using polarization-induced tunnel junctions,” Phys. Status Solidi C 4(7), 2830–2833 (2007). [CrossRef]
  16. International Commission on Illumination, Method of measuring and specifying colour rendering properties of light sources, ISBN 978–3900734572 (1995)
  17. N. Sándor and J. Schanda, “Visual color rendering based on color difference evaluations,” Lighting Res. Tech. 38(3), 225–239 (2006). [CrossRef]

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