White light emitting diodes with enhanced CCT uniformity and luminous flux using ZrO 2 nanoparticles

Kuo Ju Chen, Hau Vei Han, Hsin Chu Chen, Chien-Chung Lin*, Shih Hsuan Chien, Chung Ching Huang, Teng-Ming Chen, Min Hsiung Shih, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


To enhance the uniformity of correlated color temperature (CCT) and luminous flux, we integrated ZrO 2 nanoparticles into white light-emitting diodes. This novel packaging scheme led to a more than 12% increase in luminous flux as compared to that in conventional dispensing structures. This was attributed to the scattering effect of ZrO 2 nanoparticles, which enhanced the utilization of blue light. Moreover, the CCT deviation was reduced from 522 to 7 K in a range of -70 to +70°, and essentially eliminated the yellow ring phenomenon. The haze measurement indicated strong scattering across the visible spectrum in the presence of ZrO 2 in the silicone layer, and this finding also substantiates our claim. In addition, the chromaticity coordinate shift was steady in the ZrO 2 dispensing package structure as the drive current increased, which is crucial for indoor lighting. Combined with its low cost, easy fabrication, and superior optical characteristics, ZrO 2 nanoparticles can be an effective performance enhancer for the future generation of white light-emitting devices. This journal is

Original languageEnglish
Pages (from-to)5378-5383
Number of pages6
Issue number10
StatePublished - 21 May 2014

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