Analysis of Size-Dependent Quantum Efficiency in AlGaInP Micro–Light-Emitting Diodes With Consideration for Current Leakage

oleh: Yi-Yang Li, Fang-Zhong Lin, Kuo-Lin Chi, Shao-Yi Weng, Guan-Ying Lee, Hao-Chung Kuo, Chien-Chung Lin

Format: Article
Diterbitkan: IEEE 2022-01-01

Deskripsi

This study fabricated and analyzed AlGaInP-based red micro&#x2013;light-emitting diodes (LEDs) ranging from 2 to 15 &#x03BC;m in size. To collect photons from a single micro-LED at this scale, a solar cell chip near the micro-LEDs was used. Quantum efficiency decreased at a faster rate than that predicted by the standard ABC model under high currents, and a leakage current component was added to fully describe this phenomenon. The modified model can be used to extract valuable information regarding the micro-LEDs, such as the Shockley&#x2013;Read&#x2013;Hall coefficient. A size dependency analysis revealed that the bulk Shockley&#x2013;Read&#x2013;Hall coefficient and surface recombination velocity of the micro-LEDs were 6.81 &#x00D7; 10<sup>7</sup> 1&#x002F;sec and 5.99 &#x00D7; 10<sup>4</sup> cm&#x002F;sec, respectively. Further analysis of the size-dependent recombination effect can help us solve the side wall problem and maximize the light output of AlGaInP-based micro-LEDs for ultrahigh-resolution displays.