OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 20276–20285

Excellent color rendering indexes of multi-package white LEDs

Ji Hye Oh, Su Ji Yang, Yeon-Goog Sung, and Y. R. Do  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 20276-20285 (2012)

View Full Text Article

Enhanced HTML    Acrobat PDF (2726 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



This study introduces multi-package white light-emitting diodes (LEDs) system with the ability to realize high luminous efficacy and an excellent color rendering index (CRI, Ra) using the RB,MAB,MGB,MCB (RB,MAB,MGB,M denoted as a long-pass dichroic filter (LPDF)-capped, monochromatic red, amber and green phosphor converted-LED (pc-LED) pumped by a blue LED chip, and CB denoted as a cyan and blue mixed pc-LED pumped by a blue LED) system. The luminous efficacy and color rendering index (CRI) of multi-package white LED systems are compared while changing the concentration of the cyan phosphor used in the paste of a cyan-blue LED package and the driving current of individual LEDs in multi-package white LEDs at correlated color temperatures (CCTs) ranging from 6,500K (cold white) to 2,700K (warm white) using a set of eight CCTs as specified by the American National Standards Institute (ANSI) standard number C78.377-2008. A RB,MAB,MGB,MCB white LED system provides high luminous efficacy (≥96lm/W) and a color rendering index (≥91) encompassing the complete CCT range. We also compare the optical properties of the RB,MAB,MGB,MCB system with those of the RB,MAB,MGB,MB and RAGB (red, amber, green, and blue semiconductor-type narrow-spectrum-band LEDs) systems. It can be expected that the cyan color added to a blue LED in multi-package white LEDs based on LPDF-capped, phosphor-converted monochromatic LEDs will meet the needs of the high-quality, highly efficient, full-color white LED lighting market in the near future.

© 2012 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.0230) Optical devices : Optical devices
(230.1480) Optical devices : Bragg reflectors
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Optical Devices

Original Manuscript: April 27, 2012
Revised Manuscript: July 10, 2012
Manuscript Accepted: August 12, 2012
Published: August 20, 2012

Ji Hye Oh, Su Ji Yang, Yeon-Goog Sung, and Y. R. Do, "Excellent color rendering indexes of multi-package white LEDs," Opt. Express 20, 20276-20285 (2012)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. M. S. Shur and A. Žukauskas, “Solid-state lighting: toward superior illumination,” Proc. IEEE93(10), 1691–1703 (2005). [CrossRef]
  2. M. H. Crawford, “LEDs for solid-state lighting: performance challenges and recent advances,” IEEE J. Sel. Top. Quantum Electron.15(4), 1028–1040 (2009). [CrossRef]
  3. J. Y. Tsao, M. E. Coltrin, M. H. Crawford, and J. A. Simmons, “Solid-state lighting: an integrated human factors, technology, and economic perspective,” Proc. IEEE98(7), 1162–1179 (2010). [CrossRef]
  4. C. J. Humphreys, “Solid-state lighting,” MRS Bull.33(04), 459–470 (2008). [CrossRef]
  5. E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science308(5726), 1274–1278 (2005). [CrossRef] [PubMed]
  6. J. K. Kim and E. F. Schubert, “Transcending the replacement paradigm of solid-state lighting,” Opt. Express16(26), 21835–21842 (2008). [CrossRef] [PubMed]
  7. J. R. Oh, S.-H. Cho, H. K. Park, J. H. Oh, Y.-H. Lee, and Y. Rag, “Full down-conversion of amber-emitting phosphor-converted light-emitting diodes with powder phosphors and a long-wave pass filter,” Opt. Express18(11), 11063–11072 (2010). [CrossRef] [PubMed]
  8. J. R. Oh, S.-H. Cho, J. H. Oh, Y.-K. Kim, Y.-H. Lee, W. Kim, and Y. R. Do, “The realization of a whole palette of colors in a green gap by monochromatic phosphor-converted light-emitting diodes,” Opt. Express19(5), 4188–4198 (2011). [CrossRef] [PubMed]
  9. J. H. Oh, J. R. Oh, H. K. Park, Y.-G. Sung, and Y. R. Do, “New paradigm of multi-chip white LEDs: combination of an InGaN blue LED and full down-converted phosphor-converted LEDs,” Opt. Express19(S3Suppl 3), A270–A279 (2011). [CrossRef] [PubMed]
  10. J. H. Oh, J. R. Oh, H. K. Park, Y.-G. Sung, and Y. R. Do, “Highly-efficient, tunable green, phosphor-converted LEDs using a long-pass dichroic filter and a series of orthosilicate phosphors for tri-color white LEDs,” Opt. Express20(S1), A1–A12 (2012). [CrossRef] [PubMed]
  11. R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. Trottier, “High-power phosphor-converted light-emitting diodes based on III-Nitrides,” IEEE J. Sel. Top. Quantum Electron.8(2), 339–345 (2002). [CrossRef]
  12. J. K. Park, C. H. Kim, S. H. Park, H. D. Park, and S. Y. Choi, “Application of strontium silicate yellow phosphor for white light-emitting diodes,” Appl. Phys. Lett.84(10), 1647–1649 (2004). [CrossRef]
  13. Y.-D. Huh, J.-H. Shim, Y. Kim, and Y. R. Do, “Optical properties of three-band white light emitting diodes,” J. Electrochem. Soc.150(2), H57–H60 (2003). [CrossRef]
  14. R.-J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” Appl. Phys. Lett.90(19), 191101 (2007). [CrossRef]
  15. R. Mueller-Mach, G. Mueller, M. R. Krames, H. A. Höppe, F. Stadler, W. Schnick, T. Juestel, and P. Schmidt, “Highly efficient all-nitride phosphor-converted white light emitting diode,” Phys. Status Solidi., A Appl. Mater. Sci.202(9), 1727–1732 (2005). [CrossRef]
  16. J. K. Sheu, S. J. Chang, C. H. Kuo, Y. K. Su, L. W. Wu, Y. C. Lin, W. C. Lai, J. M. Tsai, G. C. Chi, and R. K. Wu, “White-light emission from near UV InGaN-GaN LED chip precoated, with blue/green/red phosphors,” IEEE Photon. Technol. Lett.15(1), 18–20 (2003). [CrossRef]
  17. S. Muthu, F. J. P. Schuurmans, and M. D. Pashley, “Red, green and blue LEDs for white light illumination,” IEEE J. Sel. Top. Quantum Electron.8(2), 333–338 (2002). [CrossRef]
  18. A. Žukauskas, R. Vaicekauskas, and M. Shur, “Solid-state lamps with optimized color saturation ability,” Opt. Express18(3), 2287–2295 (2010). [CrossRef] [PubMed]
  19. D.-Y. Wang, C.-H. Huang, Y.-C. Wu, and T.-M. Chen, “BaZrSi3O9:Eu2+: a cyan-emitting phosphor with high quantum efficiency for white light-emitting diodes,” J. Mater. Chem.21(29), 10818–10822 (2011). [CrossRef]
  20. H.-L. Li, R.-J. Xie, G.-H. Zhou, N. Hirosaki, and Z. Sun, “A cyan-emitting BaSi7N10:Eu2+ phosphor prepared by gas reduction and nitridation for UV-pumping white LEDs,” J. Electrochem. Soc.157(7), J251–J255 (2010). [CrossRef]
  21. J. S. Kim, P. E. Jeon, J. C. Choi, and H. L. Park, “Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode,” Solid State Commun.133(3), 187–190 (2005). [CrossRef]
  22. J. K. Park, M. A. Lim, C. H. Kim, H. D. Park, J. T. Park, and S. Y. Choi, “White light-emitting diodes of GaN-based Sr2SiO4:Eu and the luminescent properties,” Appl. Phys. Lett.82(5), 683–685 (2003). [CrossRef]
  23. H. Watanabe, H. Wada, K. Seki, M. Itou, and N. Kijima, “Synthetic method and luminescence properties of SrxCa1-xAlSiN3:Eu2+ mixed nitride phosphors,” J. Electrochem. Soc.155(3), F31–F36 (2008). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited