Spectral Optimization of Phosphor-Coated White LEDs for Color Rendering and Luminous Efficacy

Author

Guoxing He ; Ju Tang

Author_Institution

Dept. of Appl. Phys., Dong Hua Univ., Shanghai, China

Volume

26

Issue

14

fYear

2014

fDate

July15, 15 2014

Firstpage

1450

Lastpage

1453

Abstract

An optimization model for luminous efficacy of a correlated color temperature tunable phosphor-coated white (pc-W) light-emitting diode (LED) consisting of a blue LED, the phosphors, and a red LED, including down-conversion energy loss, has been developed under the constraint of the designated color rendering index. The optimized peak wavelength and full-width at half-maximum of each color component, as well as photometric and colorimetric performances of the pc-W LEDs for maximizing the luminous efficacy under various color rendering indices at a correlated color temperature of 2700 to 6500 K were presented. It has been found that the luminous efficacy for the tetrachromatic pc-W LED is higher than that for the trichromatic pc-W LED under good color rendering.

Keywords

brightness; colorimetry; light emitting diodes; optimisation; phosphors; photometry; thermo-optical effects; blue LED; color component; color rendering index; colorimetric performances; correlated color temperature tunable phosphor-coated white light-emitting diode; down-conversion energy loss; full-width at half-maximum; luminous efficacy; optimization model; optimized peak wavelength; phosphor-coated white LED; photometric performances; red LED; spectral optimization; temperature 2700 K to 6500 K; tetrachromatic pc-W LED; trichromatic pc-W LED; Color; Indexes; Light emitting diodes; Optimized production technology; Phosphors; Rendering (computer graphics); Light-emitting diodes; color temperature; luminous efficacy; optimization methods color rendering index;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2326733

Filename

6825874