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

Jung-Chieh Su; Chun-Lin Lu

doi:10.1364/OE.17.021408

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.

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References

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Other (4)

K. Man, and I. Ashdown, “Accurate colorimetric feedback for RGB LED clusters,” in Sixth International Conference on Solid State Lighting (SPIE, San Diego, CA, USA, 2006), pp. 633702–633708.

Lumileds, “Luxeon Product Binning and Labeling,” in Technical Datasheet AB21 (Lumileds Lighting LLC, San Jose, CA).

S.-W. Chen, J.-C. Su, C.-L. Lu, S.-F. Song, and J.-H. Chen, “Phosphors-conversion white light LEDs with an omni-directional reflector,” in Photonics, Devices, and Systems IV (SPIE, 2008), pp. 71382D–71388.

I. Speier, and M. Salsbury, “Color temperature tunable white light LED system,” in Sixth International Conference on Solid State Lighting (SPIE, San Diego, CA, USA, 2006), pp. 63371F–63312.