Optical Modeling of YAG Phosphor in Higher Concentration for White LEDs

• Main Authors: Zi-yan Ting, 丁姿妍
• Other Authors: Ching-cherng Sun
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/u724se

碩士 === 國立中央大學 === 照明與顯示科技研究所 === 102 === In this thesis, we have successfully built up an optical modeling of YAG phosphor in higher concentration with conformal coating. The optical modeling process includes scattering modeling, absorption coefficient and conversion efficiency. We simulate the scattering properties in YAG phosphor with Mie scattering theory based on Monte Carlo ray tracing. The simulation includes the optical behaviors of blue lights and yellow lights. The experimental measurement results are applied to figure out the absorption coefficient and conversion efficiency. Since the absorption and the emission of the phosphor is a function of incident wavelength, we introduce a β factor to increase the accuracy of phosphor simulation. Finally, we analyze the spectrum, color coordinate, packaging efficiency, and angular correlated color temperature distribution of white LEDs at different correlated color temperatures for the experimental and simulative results to verify the precision.