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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 4188–4198

The realization of a whole palette of colors in a green gap by monochromatic phosphor-converted light-emitting diodes

Jeong Rok Oh, Sang-Hwan Cho, Ji Hye Oh, Yong-Kyo Kim, Yong-Hee Lee, Woong Kim, and Young Rag Do  »View Author Affiliations

Optics Express, Vol. 19, Issue 5, pp. 4188-4198 (2011)

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A variety of efficient green, yellow, and amber monochromatic phosphor-converted light-emitting diodes (pc-LEDs) were fabricated by simply capping a long-wave pass filter (LWPF) on top of LED packing associated with each corresponding powder phosphor. In this paper, the luminous efficacy and color purity of two green, three yellow, and two amber pc-LEDs were reviewed by comparing the optical properties and current/temperature stability of each LWPF-capped pc-LED. The simple combination of LWPFs and phosphor materials in the pc-LEDs provide a simple means of addressing the low luminous efficacy problem of III-V monochromatic semiconductor LEDs in the various colors of the wavelength range between green and amber (known as the “green gap”). This technique also represents a simple approach to mitigate the sub-linearity problem of the efficacy versus the driving current occurring at a relatively low current in III-V green LEDs (known as “green droop”) to the level of a blue LED. This nano-multilayered filter-capped pc-LED can open further research into developing new color-converting materials (such as powder phosphors, and/or quantum dots) to extend the color palette in the wavelength region of the “green gap” and to improve the efficacy and color purity of color pc-LEDs.

© 2011 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: November 5, 2010
Revised Manuscript: January 28, 2011
Manuscript Accepted: January 30, 2011
Published: February 17, 2011

Jeong Rok Oh, Sang-Hwan Cho, Ji Hye Oh, Yong-Kyo Kim, Yong-Hee Lee, Woong Kim, and Young Rag Do, "The realization of a whole palette of colors in a green gap by monochromatic phosphor-converted light-emitting diodes," Opt. Express 19, 4188-4198 (2011)

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