Cao Yang Bryan, Zhang Daquan, Zhang Qianpeng, Qiu Xiao, Zhou Yu, Poddar Swapnadeep, Fu Yu, Zhu Yudong, Liao Jin-Feng, Shu Lei, Ren Beitao, Ding Yucheng, Han Bing, He Zhubing, Kuang Dai-Bin, Wang Kefan, Zeng Haibo, Fan Zhiyong
Department of Electronic & Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
State Key Laboratory of Advanced Display and Optoelectronics Technologies HKUST, Clear Water Bay, Kowloon, Hong Kong SAR, China.
Nat Commun. 2023 Aug 1;14(1):4611. doi: 10.1038/s41467-023-40150-y.
Metal halide perovskites have shown great promise as a potential candidate for next-generation solid state lighting and display technologies. However, a generic organic ligand-free and antisolvent-free solution method to fabricate highly efficient full-color perovskite light-emitting diodes has not been realized. Herein, by utilizing porous alumina membranes with ultra-small pore size as templates, we have successfully fabricated crystalline all-inorganic perovskite quantum wire arrays with ultrahigh density and excellent uniformity, using a generic organic ligand-free and anti-solvent-free solution method. The quantum confinement effect, in conjunction with the high light out-coupling efficiency, results in high photoluminescence quantum yield for blue, sky-blue, green and pure-red perovskite quantum wires arrays. Consequently, blue, sky-blue, green and pure-red LED devices with spectrally stable electroluminescence have been successfully fabricated, demonstrating external quantum efficiencies of 12.41%, 16.49%, 26.09% and 9.97%, respectively, after introducing a dual-functional small molecule, which serves as surface passivation and hole transporting layer, and a halide vacancy healing agent.
金属卤化物钙钛矿作为下一代固态照明和显示技术的潜在候选材料已展现出巨大潜力。然而，尚未实现一种通用的无有机配体且无抗溶剂的溶液法来制备高效全彩钙钛矿发光二极管。在此，通过使用孔径超小的多孔氧化铝膜作为模板，我们采用一种通用的无有机配体且无抗溶剂的溶液法，成功制备出了具有超高密度和优异均匀性的晶体全无机钙钛矿量子线阵列。量子限域效应与高光出射耦合效率相结合，使得蓝色、天蓝色、绿色和纯红色钙钛矿量子线阵列具有高光致发光量子产率。因此，在引入一种兼具表面钝化和空穴传输层功能的双功能小分子以及卤化物空位修复剂后，成功制备出了具有光谱稳定电致发光的蓝色、天蓝色、绿色和纯红色发光二极管器件，其外量子效率分别为12.41%、16.49%、26.09%和9.97%。
