韩国三星显示Lee, Changhee团队开发了高效蓝色InGaN纳米发光二极管。相关研究成果发表在2022年8月3日出版的《自然》。
氮化铟镓（InGaN）基微型LEDs（μLEDs）由于其高效率、亮度和稳定性适合满足不断增长的高性能显示器需求。然而，μLEDs存在一个大问题，即外部量子效率（EQE）随着尺寸的减小而降低。
该文中，研究人员展示了具有高EQE的蓝色InGaN/GaN多量子阱（MQW）纳米棒LEDs（nLEDs）。为了克服尺寸相关的EQE减少问题，研究人员通过各种分析研究了GaN表面和侧壁钝化层之间的相互作用。最小化钝化过程中产生的点缺陷对于制造高性能nLEDs至关重要。值得注意的是，溶胶-凝胶法有利于钝化，因为SiO2纳米颗粒吸附在GaN表面，从而最小化其原子相互作用。制作的nLEDs显示出20.2±0.6%的EQE，这是纳米级LEDs的最高EQE值。
该工作为制造自发射nLEDs显示器开辟了道路，该显示器可以成为下一代显示器的一项使能技术。
附：英文原文
Title: Highly efficient blue InGaN nanoscale light-emitting diodes
Author: Sheen, Mihyang, Ko, Yunhyuk, Kim, Dong-uk, Kim, Jongil, Byun, Jin-ho, Choi, YongSeok, Ha, Jonghoon, Yeon, Ki Young, Kim, Dohyung, Jung, Jungwoon, Choi, Jinyoung, Kim, Ran, Yoo, Jewon, Kim, Inpyo, Joo, Chanwoo, Hong, Nami, Lee, Joohee, Jeon, Sang Ho, Oh, Sang Ho, Lee, Jaekwang, Ahn, Nari, Lee, Changhee
Issue&Volume: 2022-08-03
Abstract: Indium gallium nitride (InGaN)-based micro-LEDs (μLEDs) are suitable for meeting ever-increasing demands for high-performance displays owing to their high efficiency, brightness and stability1,2,3,4,5. However, μLEDs have a large problem in that the external quantum efficiency (EQE) decreases with the size reduction6,7,8,9. Here we demonstrate a blue InGaN/GaN multiple quantum well (MQW) nanorod-LED (nLED) with high EQE. To overcome the size-dependent EQE reduction problem8,9, we studied the interaction between the GaN surface and the sidewall passivation layer through various analyses. Minimizing the point defects created during the passivation process is crucial to manufacturing high-performance nLEDs. Notably, the sol–gel method is advantageous for the passivation because SiO2 nanoparticles are adsorbed on the GaN surface, thereby minimizing its atomic interactions. The fabricated nLEDs showed an EQE of 20.2±0.6%, the highest EQE value ever reported for the LED in the nanoscale. This work opens the way for manufacturing self-emissive nLED displays that can become an enabling technology for next-generation displays.
DOI: 10.1038/s41586-022-04933-5
Source: https://www.nature.com/articles/s41586-022-04933-5