Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2326733
