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; Hao-Chung Kuo

doi:10.3390/nano13040661

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

Nanomaterials (Basel). 2023 Feb 8;13(4):661. doi: 10.3390/nano13040661.

Authors

Wen-Chien Miao^{1

2}, Yu-Heng Hong¹, Fu-He Hsiao^{1

2}, Jun-Da Chen¹, Hsin Chiang³, Chun-Liang Lin², Chien-Chung Lin⁴, Shih-Chen Chen¹, Hao-Chung Kuo^{1

3}

Affiliations

¹ Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan.
² Department of Electrophysics, College of Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
³ Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
⁴ Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.

Abstract

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.

Keywords: InGaN; color stability; micro-LED; modified DBR.

Grants and funding

Grant Nos. MOST 111-2124-M-A49 -004 -/Ministry of Science and Technology in Taiwan