Rational Distributed Bragg Reflector Design for Improving Performance of Flip-Chip Micro-LEDs
Electronics (Switzerland), ISSN: 2079-9292, Vol: 11, Issue: 19
2022
- 8Citations
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Electronics, Vol. 11, Pages 3030: Rational Distributed Bragg Reflector Design for Improving Performance of Flip-Chip Micro-LEDs
Electronics, Vol. 11, Pages 3030: Rational Distributed Bragg Reflector Design for Improving Performance of Flip-Chip Micro-LEDs Electronics doi: 10.3390/electronics11193030 Authors: Yuechang Sun Lang Shi Peng
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Research on Electronics Reported by Researchers at Wuhan University (Rational Distributed Bragg Reflector Design for Improving Performance of Flip-Chip Micro-LEDs)
2022 NOV 01 (NewsRx) -- By a News Reporter-Staff News Editor at Electronics Daily -- Research findings on electronics are discussed in a new report.
Article Description
The distributed Bragg reflector (DBR) has been widely used in flip-chip micro light-emitting diodes (micro-LEDs) because of its high reflectivity. However, the conventional double-stack DBR has a strong angular dependence and a narrow reflective bandwidth. Here, we propose a wide reflected angle TiO/SiO DBR (WRA-DBR) for AlGaInP-based red and GaN-based green/blue flip-chip micro-LEDs (RGB flip-chip micro-LEDs) to overcome the drawbacks of the double-stack DBR. The WRA-DBR consisting of six sub-DBRs has high reflectivity within the visible light wavelength region at an incident angle of light ranging from 0° to 60°. Furthermore, the influence of the WRA-DBR and double-stack DBR on performances of RGB flip-chip micro-LEDs is numerically investigated based on the finite-difference time-domain method. Owing to higher reflectivity and less angular dependence of the WRA-DBR, the RGB flip-chip micro-LEDs with the WRA-DBR have a stronger electric field intensity in the top side in comparison with RGB flip-chip micro-LEDs with the double-stack DBR, which indicates that more photons can be extracted from micro-LEDs with the WRA-DBR.
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