Influence of junction temperature on chromaticity and color-rendering properties of trichromatic white-light sources based on light-emitting diodes

被引：259

作者：

Chhajed, S

Xi, Y

Li, YL

Gessmann, T

Schubert, EF ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA

[2] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 97卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.1852073

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Trichromatic white-light sources based on light-emitting diodes (LEDs) offer a high luminous efficacy of radiation, a broad range of color temperatures and excellent color-rendering properties with color-rendering indices (CRIs) exceeding 85. An analysis of the luminous efficacy and CRI of a trichromatic light source is performed for a very broad range of wavelength combinations. The peak emission wavelength, spectral width, and the output power of LEDs strongly depend on temperature and the dependencies for red, green, and blue LEDs are established. A detailed analysis of the temperature dependence of trichromatic white LED sources reveals that the luminous efficacy decreases, the color temperature increases, the CRI decreases and the chromaticity point shifts towards the blue as the junction temperature increases. A high CRI>80 can be maintained, by adjusting the LED power ratio so that the chromaticity point is conserved. (C) 2005 American Institute of Physics.

引用

页数：8

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