Angular color variation in micron-scale light-emitting diode arrays

Shu Mei Yang, Po Hsun Wang, Chia Hsin Chao, Chun Wen Chu, Yin Tien Yeh, Yu Sheng Chen, Feng Pin Chang, Yen Hsiang Fang, Chien-Chung Lin*, Chih I. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A simulation scheme was developed to explore the light distribution of full-color micron-scale light-emitting diode (LED) arrays. The influences of substrate thickness, patterning, and cutting angle of the substrate on several important features, such as light field pattern, light extraction efficiency, and color variation, were evaluated numerically. An experiment was conducted; the results were consistent with simulation results for a 225 × 125 µm2 miniLED and those for an 80 × 80 µm2 microLED. Based on the simulation results, the light extraction efficiency of LED devices with a substrate increases by 67.75% over the extraction efficiency of those without a substrate. The light extraction efficiency of LED devices with a substrate increases by 113.55% when an additional patterned design is used on green and blue chips. The calculated large angle ∆u0v0 can be as low as 0.015 for miniLED devices.

Original languageEnglish
Pages (from-to)A1308-A1323
JournalOptics Express
Volume27
Issue number16
DOIs
StatePublished - 5 Aug 2019

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