An investigation of the optical analysis in white light-Emitting diodes with conformal and remote phosphor structure

Kuo Ju Chen, Hsin Chu Chen, Chien-Chung Lin, Chao Hsun Wang, Chia Chi Yeh, Hsin Han Tsai, Shih Hsuan Chien, Min Hsiung Shih, Hao-Chung Kuo

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

An effective emission model of phosphor film is proposed by using bidirectional scattering distribution function system (BSDF), and the model is verified by white light-emitting diodes (LEDs) with conformal and remote phosphor structure. The emission model is built to clarify the optical characteristics by analyzing the angular-dependent distribution of emission and excitation behaviors in phosphor film. The white LEDs with conformal and remote phosphor structure are also fabricated for experimental comparison. The uniformity of angular correlated color temperature (CCT) in white LEDs can be determined by the angular distribution of blue and yellow light, which is in turns decided by the refractive index variation between chip a

Original languageEnglish
Article number6556941
Pages (from-to)915-920
Number of pages6
JournalIEEE/OSA Journal of Display Technology
Volume9
Issue number11
DOIs
StatePublished - 2 Dec 2013

Keywords

  • GaN
  • Light-emitting diodes (LEDs)
  • Optical simulation
  • Phosphor

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