A precise optical model of phosphor-based multi-chip white LEDs

Wei-Ting Chien; Tsung-Xian Lee; Shin-Xing Ma; Ching-Cherng Sun; Ivan Moreno

doi:10.1117/12.733326

14 September 2007 A precise optical model of phosphor-based multi-chip white LEDs

Wei-Ting Chien, Tsung-Xian Lee, Shin-Xing Ma, Ching-Cherng Sun, Ivan Moreno

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 66690N (2007) https://doi.org/10.1117/12.733326
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

A single-chip white light LED is commonly modeled by considering the phosphor coating as a homogeneous Lambertian light source. However, this approach leads to an incorrect optical simulation of phosphor-coated multi-chip LEDs due to the presence of a previously unreported spatial distribution of emission spots across the phosphor layer. We introduce "weighting" factors based on position-dependent light strength across the phosphor surface in order to improve the model accuracy. Following the modeling algorithm in the mid-field region, we have built up a precise and practical optical model by using Monte Carlo ray tracing and weighting factors. We measure the LED radiation distribution at several representative distances to test the model performance. In all cases, the accuracy is higher than 99.5% in normalized cross correlation between the simulated pattern and experimental measurement.

Citation Download Citation

Wei-Ting Chien, Tsung-Xian Lee, Shin-Xing Ma, Ching-Cherng Sun, and Ivan Moreno "A precise optical model of phosphor-based multi-chip white LEDs", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690N (14 September 2007); https://doi.org/10.1117/12.733326

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