KBr@YAG:Ce3+ phosphor compound aiming to the optical improvements white leds

Abstract

This study presents the utilization of KBr phosphor powder and its simulation works in conventional phosphor compound for improving the luminescence and color uniformity of the white light-emitted diodes (WLED) light output. The introduction of KBr powder with a radius of 4 microns may result in the scattering of the phosphor compound, contributing to the better wide-angle light dispersion performance. The simulation of KBr is carried out with Mie-Lorenz scattering practices and MATLAB programs. The concentration of KBr powder in the phosphor compound is adjusted to gauge its influence on various optical attributes such as scattering coefficient, YGA:Ce3+ phosphor dosage, angular distribution of light, etc. Results demonstrate that the increase of scattering strength and variation color variation under larger KBr powder concentration. The increase in lumen output is noted under higher concentration of KBr in the compound while the chromatic rendition performance, expressed via CRI and CQS, is preserved. The findings show that there is potential in using KBr powder for improving the performance of phosphor compound under visible excitation wavelengths.