AlGaInP Red LEDs with Hollow Hemispherical Polystyrene Arrays

Wen Ching Cheng, Shih Yung Huang, Yi Jiun Chen, Chia Sheng Wang, Hoang Yan Lin, Tzong Ming Wu, Ray-Hua Horng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A hollow hemispherical polystyrene (HHPS) was fabricated to reduce total internal reflection in AlGaInP-based LEDs. At an injection current of 350 mA, the external quantum efficiencies of LED-I, LED-II, LED-III, and LED-IV are 20.92%, 24.65%, 27.28%, and 33.77% and the wall-plug efficiencies are 17.11%, 20%, 22.5%, and 27.33%, respectively. The enhanced performance is attributed to the light output power enhancement through the surface roughness, microlens-liked PS hemisphere, and scatter-liked HHPS array. In this paper, the rigorous coupled wave analysis (RCWA) numerical method was also conducted to demonstrate the HHPS array effectively enlarge the effective light cone.

Original languageEnglish
Article number911
JournalScientific reports
Volume8
Issue number1
DOIs
StatePublished - 1 Dec 2018

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