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

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

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.

Original languageEnglish
Title of host publicationSeventh International Conference on Solid State Lighting
DOIs
StatePublished - 2007
Event7th International Conference on Solid State Lighting - San Diego, CA, United States
Duration: 27 Aug 200729 Aug 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6669
ISSN (Print)0277-786X

Conference

Conference7th International Conference on Solid State Lighting
Country/TerritoryUnited States
CitySan Diego, CA
Period27/08/0729/08/07

Keywords

  • Multi-chip
  • Phosphor
  • White LED

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