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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 4 — Feb. 25, 2013
  • pp: 4539–4550

Improved color coordinates of green monochromatic pc-LED capped with a band-pass filter

Ji Hye Oh, Su Ji Yang, Yeon-Goog Sung, and Young Rag Do  »View Author Affiliations


Optics Express, Vol. 21, Issue 4, pp. 4539-4550 (2013)
http://dx.doi.org/10.1364/OE.21.004539


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Abstract

This study introduces a “greener” green monochromatic phosphor-converted light-emitting diode (pc-LED) using a band-pass filter (BPF) combined with a long-pass dichroic filter (LPDF) and a short-pass dichroic filter (SPDF) to improve the color quality of our previously developed LPDF-capped green pc-LED. This can also address the drawbacks of III-V semiconductor-type green LEDs, which show a low luminous efficacy and a poor current dependence of the efficacy and color coordinates compared to blue semiconductor-type LEDs. The optical properties of green monochromatic pc-LEDs using a BPF are compared with those of LPDF-capped green pc-LEDs, which have a broad band spectrum, and III-V semiconductor-type green LEDs by changing the transmittance wavelength range of the BPF and the peak wavelength of the green phosphors. BPF-capped green monochromatic pc-LEDs provide a high luminous efficacy (134 lm/W at 60 mA), and “greener” 1931 Commission Internationale d'Eclairage (CIE; CIEx, CIEy) color coordinates (0.24, 0.66) owing to the narrowed emission spectrum. We also propose a two-dimensional (2D) polystyrene (PS) microbead (2-μm diameter) monolayer as a scattering layer to overcome the poor angular dependence of the color coordinates of the transmitted light through a nano-multilayered dichroic filter such as an LPDF or BPF. The 2D PS scattering layer improves the angular dependence of the green color emitted from a BPF-capped green pc-LED with only 3% loss of luminous efficacy.

© 2013 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: September 20, 2012
Revised Manuscript: January 31, 2013
Manuscript Accepted: February 7, 2013
Published: February 14, 2013

Citation
Ji Hye Oh, Su Ji Yang, Yeon-Goog Sung, and Young Rag Do, "Improved color coordinates of green monochromatic pc-LED capped with a band-pass filter," Opt. Express 21, 4539-4550 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-4-4539


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