Journal
OPTICAL MATERIALS
Volume 114, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.110860
Keywords
Micro-LED; Size effect; Sulfur passivation; EQE
Categories
Funding
- National Natural Science Foundation of China [51702212, 51802195]
- Science and Technology Commission of Shanghai Municipality [18511110600, 19ZR1435200]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00015]
- Program of Shanghai Academic Research Leader [19XD1422900]
- ChenGuang Scholar Project of Shanghai Education Commission [19CG52, 19CG53]
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The research finds that the larger the diameter of micro-LED, the higher the external quantum efficiency (EQE); as the diameter decreases, the carrier lifetime reduces, possibly due to more surface states present in the smaller diameter micro-LEDs.
The micro lighting-emitting diode (Micro-LED) array devices have attracted attention due to increasing demand in augmented reality (AR), virtual reality (VR), LIFI light source, and other micro-display applications. However, with the decrease of micro-LED diameter, the performance of micro-LED is severely limited due to the size effect. In the work, the AlGaInP based red micro-LED with diameter ranging from 2 to 16 mu m was prepared to study the size effect of micro-LED array, the array with larger micro-LED diameter show higher external quantum efficiency (EQE), meanwhile, the carrier lifetime decrease with the decreasing of the diameter, which can be explained by more surface states in the micro-LED with smaller diameter. The enhancement of EQE by 2 times has been achieved after surface passivation in (NH4)2Sx solution.
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