Improvement of light quality by ZrO2 film of chip on glass structure white LED

Huang Yu Lin, Zhi Ting Ye, Chien-Chung Lin, Kuo Ju Chen, Hsien Hao Tu, Huang-Ming Chen, Cheng-Huan Chen, Hao-Chung Kuo

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A novel combination of blue LED chips, transparent glass substrates and phosphors with PDMS thin film is demonstrated. The flipchip bonding technology is applied to facilitate this design. The ZrO2 nanoparticles are also doped into the PDMS film to increase light scattering. The resultant luminous efficiency shows an 11% enhancement when compared to the regular COG device. The variation of correlated color temperature of such devices is also reduced to 132K. In addition to these changes, the surface temperature is reduced from 121°C to 104°C due to good thermal dissipation brought by ZrO2 nanoparticles.

Original languageEnglish
Pages (from-to)A341-A349
JournalOptics Express
Issue number2
StatePublished - 25 Jan 2016

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