Modified Distributed Bragg Reflectors for Color Stability in InGaN Red Micro-LEDs

Wen-Chien Miao, Yu-Heng Hong, Fu-He Hsiao, Jun-Da Chen, Hsin Chiang, Chun-Liang Lin, Chien-Chung Lin, Shih-Chen Chen and Hao-Chung Kuo

Nanomaterials13(4), 661 (2023) — Published in February 2023


The monolithic integration of InGaN-based micro-LEDs is being of interest toward developing full-color micro-displays. However, the color stability in InGaN red micro-LED is an issue that needs to be addressed. In this study, the modified distributed Bragg reflectors (DBRs) were designed to reduce the transmission of undesired spectra. The calculated optical properties of the InGaN red micro-LEDs with conventional and modified DBRs have been analyzed, respectively. The CIE 1931 color space and the encoded 8-bit RGB values are exhibited for the quantitative assessment of color stability. The results suggest the modified DBRs can effectively reduce the color shift, paving the way for developing full-color InGaN-based micro-LED displays.