Precise optical model of multi-chip white LEDs

Wei Ting Chien, Ching Cherng Sun, Ivan Moreno

研究成果: 雜誌貢獻期刊論文同行評審

94 引文 斯高帕斯(Scopus)


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.

頁(從 - 到)7572-7577
期刊Optics Express
出版狀態已出版 - 11 6月 2007


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