Phosphor chessboard packaging for white LEDs in high efficiency and high color performance

Quang Khoi Nguyen, Yu Yu Chang, Chun Yan Lu, Tsung Hsun Yang, Te Yuan Chung, Ching Cherng Sun

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

Abstract

We performed the simulation of white LEDs packaging with different chessboard structures of white light converting phosphor layer covered on GaN die chip. Three different types of chessboard structures are called type 1, type 2 and type 3, respectively. The result of investigation according to the phosphor thickness show the increasing of thickness of phosphor layer are, the decreasing of output blue light power are. Meanwhile, the changes of yellow light are neglect. Type 3 shows highest packaging efficiency of 74.3 % compares with packaging efficiency of type 2 and type 1 (72.5 % and 71.3 %, respectively). Type 3 also shows the most effect of forward light. Attention that the type 3 chessboard structure gets packaging efficiency of 74.3 % at color temperature of daylight as well as high saving of phosphor amount. The color temperatures of three types of chessboard structure are higher than 5000 K, so they are suitable for lighting purpose. The angular correlate color temperature deviation (ACCTD) of type 1, type 2 and type 3 are 6500K, 11500K and 17000K, respectively.

Original languageEnglish
Title of host publicationFifteenth International Conference on Solid State Lighting and LED-Based Illumination Systems
EditorsNikolaus Dietz, Matthew H. Kane, Ian T. Ferguson
PublisherSPIE
ISBN (Electronic)9781510602991
DOIs
StatePublished - 2016
Event15th International Conference on Solid State Lighting and LED-Based Illumination Systems - San Diego, United States
Duration: 31 Aug 2016 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9954
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference15th International Conference on Solid State Lighting and LED-Based Illumination Systems
Country/TerritoryUnited States
CitySan Diego
Period31/08/16 → …

Keywords

  • high efficiency and high color performance
  • LEDs packaging

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