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© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Micro-LEDs have found widespread applications in modular large-screen TVs, automotive displays, and high-resolution-density augmented reality glasses. However, these micron-sized LEDs experience a significant efficiency reduction due to the defects originating from the dry etching process. By controlling the current distribution via engineering the electrode size, electrons will be less concentrated in the defect region. In this work, we propose a blue InGaN/GaN compound parabolic concentrator micro-LED with a metallic sidewall to boost efficiency by combining both an optical dipole cloud model and electrical TCAD (Technology Computer-Aided Design) model. By merely modifying the p-GaN contact size, the external quantum efficiency (EQE) can be improved by 15.6%. By further optimizing the passivation layer thickness, the EQE can be boosted by 52.1%, which helps enhance the display brightness or lower power consumption.

Details

Title
High-Efficiency Vertical-Chip Micro-Light-Emitting Diodes via p-GaN Optimization and Surface Passivation
Author
Qian, Yizhou 1   VIAFID ORCID Logo  ; En-Lin, Hsiang 1 ; Yu-Hsin, Huang 2 ; Kuan-Heng, Lin 2 ; Wu, Shin-Tson 1   VIAFID ORCID Logo 

 College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA; [email protected] (Y.Q.); [email protected] (E.-L.H.) 
 AUO Corporation, Hsinchu Science Park, Hsinchu 300, Taiwan; [email protected] (Y.-H.H.); [email protected] (K.-H.L.) 
First page
503
Publication year
2024
Publication date
2024
Publisher
MDPI AG
e-ISSN
20734352
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3072305983
Copyright
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.