近日，中国科学院宁波材料技术与工程研究所的向超宇研究员及其研究团队取得一项新进展。经过不懈努力，他们实现高亮度下高效稳定钙钛矿发光二极管相尺寸解析。相关研究成果已于2024年2月5日在国际知名学术期刊《自然—光子学》上发表。
本文介绍了一种简便的化学洗涤方法——溶剂筛法，旨在解决金属卤化物钙钛矿的相尺寸问题。经过精心筛选，钙钛矿多量子阱结构中缺陷丰富的低n相被有效去除。经过优化内在结构后，筛选后的钙钛矿展现出了卓越的性能。在12000 cdm-2的高光强下，其外部量子效率、电流效率和T50寿命分别达到了创纪录的29.5%、127.4 cdA-1和18.67小时，相当于在100 cdm-2下超过50317小时或5.7年的持久性。此外，其最大亮度更是超过了147,872.8 cd m-2。
值得一提的是，这种钙钛矿还具有出色的抗空气和防潮性能，室温保存100天后，其薄膜光致发光量子产率仍能保持在75%以上，器件EQE也维持在80%以上。该研究报道的溶剂筛处理方法证明了金属卤化物钙钛矿发光的可行性，并为其在商业应用中的高亮度钙钛矿发光二极管效率和稳定性潜力的释放提供了有力支持。
据悉，钙钛矿发光二极管的效率和稳定性问题，特别是在高亮度下，是显示和照明应用迫切需要解决的问题。
附：英文原文
Title: Phase dimensions resolving of efficient and stable perovskite light-emitting diodes at high brightness
Author: Ding, Shuo, Wang, Qiangqiang, Gu, Wencui, Tang, Zhaobing, Zhang, Bo, Wu, Chunyan, Zhang, Xuanyu, Chen, Hao, Zhang, Xinyu, Cao, Rui, Chen, Tao, Qian, Lei, Xiang, Chaoyu
Issue&Volume: 2024-02-05
Abstract: The efficiency and stability issues of perovskite light-emitting diodes, especially at high brightness, need to be urgently solved for displays and lighting applications. Herein we present a simple chemical washing method called solvent sieve to resolve the phase dimension issue of metal halide perovskites. After being sieved, undesirable defect-rich low-n phases are selectively screened out of perovskite multi-quantum-well structures. With better intrinsic structure refinement, the sieved perovskites demonstrated not only a record external quantum efficiency, current efficiency, and T50 lifetime of 29.5%, 127.4cdA-1, and 18.67h at 12,000cdm-2 (the equivalent of over 50,317h or 5.7 years at 100cdm-2), respectively, with a maximum luminance of over 147,872.8cd m-2, but also extraordinary resistance to air and moisture, maintaining over 75% of film photoluminescence quantum yield and 80% of device EQE after being stored at ambience for 100 days. The simple solvent sieve treatment we reported here confirms the feasibility of metal halide perovskites for luminescence and unleashes the efficiency and stability potentials of high-brightness perovskite light-emitting diodes for future commercial applications.
DOI: 10.1038/s41566-023-01372-0
Source: https://www.nature.com/articles/s41566-023-01372-0