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

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References

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2009 (1)

2008 (1)

2005 (1)

2004 (1)

Choi, H. W.

Chu, C.-W.

Gu, Y.

Hirosaki, N.

Hui, K. N.

Kimura, N.

Lai, P. T.

Lu, C.-L.

Narendran, N.

Ohashi, M.

Omichi, K.

Sakuma, K.

Su, J.-C.

Suehiro, T.

Tanaka, D.

Xie, R.-J.

Yamamoto, Y.

Appl. Opt. (1)

J. Display Technol. (1)

Opt. Express (1)

Opt. Lett. (1)

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.

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Figures (7)

Fig. 1
Fig. 1

Schematic package structure of CCT tunable white LED with an ODR

Fig. 2
Fig. 2

Emission spectra for red, green phosphors, blue LED and total sum spectrum.

Fig. 3
Fig. 3

Emission spectrum of white LED with and without an ODR

Fig. 4
Fig. 4

Tunable color gamut and color coordinates of test points.

Fig. 5
Fig. 5

Color temperature distribution of white LED with a diffuser and ODR.

Fig. 6
Fig. 6

Chromaticity coordinates and output power distributions of white LED with a diffuser and ODR.

Fig. 7
Fig. 7

I-V curve of multi-LED chips with wavelengths of 370, 410 and 465 nm

Tables (2)

Tables Icon

Table 1 Emission peak wavelength of phosphors by source LED

Tables Icon

Table 2 Color properties of each test point

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