Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package

H. C. Chen, K. J. Chen, Chien-Chung Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, M. H. Shih, Hao-Chung Kuo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this paper, white light-emitting diodes (LEDs) with air-gap embedded package were proposed and fabricated by a simple method including pulsed spray coating. The lumen efficiency of air-gap embedded LED was enhanced by 8.8% at driving current of 350 mA, compared to conventional remote phosphor white LED. This improvement was due to the enhanced utilization of blue and yellow rays, which were confirmed by pulse current-dependent correlated color temperature (CCT). The utilization efficiency of blue rays was enhanced by 12.4% due to the embedded air-gap layer. The simulation results performed by Monte-Carlo ray tracing method agreed with our experiments, which showed enhancement in lumen efficiency and similar CCT. Finally, the electric field intensity versus different thickness for air-gap and no air-gap embedded white LED was calculated to check the incident blue rays trapped in phosphor layer.

Original languageEnglish
Pages (from-to)933-936
Number of pages4
JournalMicroelectronics Reliability
Volume52
Issue number5
DOIs
StatePublished - 1 May 2012

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