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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21408–21413

Color temperature tunable white light emitting diodes packaged with an omni-directional reflector

Jung-Chieh Su and Chun-Lin Lu  »View Author Affiliations


Optics Express, Vol. 17, Issue 24, pp. 21408-21413 (2009)
http://dx.doi.org/10.1364/OE.17.021408


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Abstract

This study proposed a correlated color temperature (CCT) tunable phosphor-converted white light emitting diode (LED) with an omni-directional reflector (ODR). Applying current to each individual InGaN based ultraviolet, purple and blue source LED chip of the white LED package, we can achieve the CCT tunability. The optimum color properties of the resulting white light are (0.3347, 0.3384), 5398 K, 81, 3137~8746 K for color coordinates, CCT, color rendering index (CRI) and CCT tuning range, respectively. Roughening the ODR substrate, we solve the non-uniformity color distribution caused by the reflectance of the ODR and positioning of source LED chips.

© 2009 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Optical Devices

History
Original Manuscript: September 28, 2009
Revised Manuscript: October 30, 2009
Manuscript Accepted: October 30, 2009
Published: November 9, 2009

Citation
Jung-Chieh Su and Chun-Lin Lu, "Color temperature tunable white light emitting diodes packaged with an omni-directional reflector," Opt. Express 17, 21408-21413 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-24-21408


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References

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