Open AccessAngular color variation in micron-scale light-emitting diode arrays
Author(s) -
Shu Yang,
Po Hsun Wang,
Chia-Hsin Chao,
Chun Wen Chu,
Yin Tien Yeh,
Yu Sheng Chen,
Feng Pin Chang,
Y.H. Fang,
Chien-Chung Lin,
Chih I. Wu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.0a1308
Subject(s) - materials science , light emitting diode , optics , substrate (aquarium) , optoelectronics , diode , extraction (chemistry) , light field , physics , chemistry , oceanography , chromatography , geology
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 µm 2 miniLED and those for an 80 × 80 µm 2 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 Δu'v' can be as low as 0.015 for miniLED devices.