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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)
http://dx.doi.org/10.1364/OE.20.020276


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Abstract

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

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

Citation
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)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-18-20276


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