Patterned structure of remote phosphor for phosphor-converted white LEDs

Hao-Chung Kuo, Cheng Wei Hung, Hsin Chu Chen, Kuo Ju Chen, Chao Hsun Wang, Chin Wei Sher, Chia Chi Yeh, Chien-Chung Lin, Cheng-Huan Chen, Yuh Jen Cheng

Research output: Contribution to journalArticlepeer-review

155 Scopus citations

Abstract

High efficiency white light-emitting diodes with superior colormixing have been investigated. It is suggested that the patterned remote phosphor structure could improve the uniformity of angular-dependent correlated color temperature (CCT) and achieve high chromatic stability in wider operating current range, as compared to the conventional remote phosphor coating structure. In this experiment, we employed a pulse spray coating method to place the patterned phosphor on the package and to leave a window region. The window area, a clear space without coating of the phosphor not only increases the extraction efficiency of blue rays at large angle, but also improves the stability of angular-dependent CCT. Moreover, the CCT deviation could be reduced from 1320 K to 266 K by this patterned remote phosphor method, and the stray blue/yellow light within the package can be effectively reduced and controlled. The design was verified both experimentally and theoretically.

Original languageEnglish
Pages (from-to)A930-A936
Number of pages7
JournalOptics Express
Volume19
Issue number104
DOIs
StatePublished - 4 Jul 2011

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