卤化物
纳米晶
电致发光
光致发光
碱金属
兴奋剂
二极管
量子产额
发光
材料科学
光电子学
发光二极管
铕
量子效率
无机化学
纳米技术
化学
光学
物理
荧光
有机化学
图层(电子)
作者
Li Xu,Xu Chen,Huifang Jiang,Meng Wang,Shuailing Lin,Zhuangzhuang Ma,Hui Wang,Huifang Ji,Mochen Jia,Yanbing Han,Jing Wang,Gencai Pan,Di Wu,Xinjian Li,Wen Xu,Ying Liu,Chongxin Shan,Zhifeng Shi
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-05-24
卷期号:24 (22): 6601-6609
被引量:3
标识
DOI:10.1021/acs.nanolett.4c01155
摘要
Lead-halide perovskite nanocrystals (NCs) are promising for fabricating deep-blue (<460 nm) light-emitting diodes (LEDs), but their development is plagued by low electroluminescent performance and lead toxicity. Herein, the synthesis of 12 kinds of highly luminescent and eco-friendly deep-blue europium (Eu2+)-doped alkali-metal halides (AX:Eu2+; A = Na+, K+, Rb+, Cs+; X = Cl–, Br–, I–) NCs is reported. Through adjustment of the coordination environment, efficient deep-blue emission from Eu-5d → Eu-4f transitions is realized. The representative CsBr:Eu2+ NCs exhibit a high photoluminescence quantum yield of 91.1% at 441 nm with a color coordinate at (0.158, 0.023) matching with the Rec. 2020 blue specification. Electrically driven deep-blue LEDs from CsBr:Eu2+ NCs are demonstrated, achieving a record external quantum efficiency of 3.15% and half-lifetime of ∼1 h, surpassing the reported metal-halide deep-blue NCs-based LEDs. Importantly, large-area LEDs with an emitting area of 12.25 cm2 are realized with uniform emission, representing a milestone toward commercial display applications.
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