Using SiO2-Based Distributed Bragg Reflector to Improve the Performance of AlGaInP-Based Red Micro-Light Emitting Diode
- Authors
- Lee, Sang-Youl; Moon, Ji Hyung; Moon, Yong-Tae; Choi, Byoungjun; Oh, Jeong-Tak; Jeong, Hwan-Hee; Seong, Tae-Yeon; Amano, Hiroshi
- Issue Date
- 19-2월-2020
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v.9, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
- Volume
- 9
- Number
- 3
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57620
- DOI
- 10.1149/2162-8777/ab74c3
- ISSN
- 2162-8769
- Abstract
- We have investigated how different types of the reflectors affected the optical and electrical performance of AlGaInP-based microLEDs. Simulations showed that the AlGaAs-based epitaxial distributed Bragg reflector (DBR) had a stopband at the 610-624 nm region with reflectivity of 90%, the SiO2/TiO2 dielectric DBR gave a stopband at the 580-770 nm range with a maximum reflectivity of 99%, and the ITO/Ag metal reflector exhibited reflectivity of 90% across the 400-800 nm region. All micro-LEDs gave forward voltages of 1.895-1.960 V at 20 mu A. The micro-LEDs with the dielectric DBR and metal reflector yielded 31% and 13% higher light output at 20 mu A than that with the epitaxial DBR, respectively. All of the micro-LEDs contained a shoulder peak at approximately 615 nm in their electroluminescence spectra. Ray-tracing simulations exhibited that the micro-LEDs with the dielectric DBR and metal reflector produced 26% and 22% higher total light output power than the one with the epitaxial DBR, respectively. It was also shown that for the micro-LEDs with the metal reflector, some of the micro-LEDs were detached from the metal reflectors due to the interfacial voids induced as a result of agglomeration of Ag layer during fabrication process. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.