MODELING LIGHT-EXTRACTION CHARACTERISTICS OF PACKAGED LIGHT-EMITTING-DIODES

We employ a Monte Carlo ray-tracing technique to model light-extractio n characteristics of light-emitting diodes. By relaxing restrictive as sumptions on photon traversal history, our method improves upon availa ble analytical models for estimating light-extraction efficiencies fro m bare LED chips, and enhances modeling capabilities by realistically treating the various processes which photons can encounter in a packag ed LED, Our method is not only capable of calculating extraction effic iencies, but can also provide extensive statistical information on pho ton extraction processes, and predict LED spatial emission characteris tics.