钝化
钙钛矿(结构)
卤化物
电致发光
材料科学
光电子学
纳米晶
光致发光
发光二极管
二极管
结晶学
图层(电子)
无机化学
纳米技术
化学
作者
Chen Tian,Xue‐Chen Ru,Wei Ma,Li‐Zhe Feng,Kuang‐Hui Song,Jing Ge,Bai‐Sheng Zhu,Jun‐Nan Yang,Hong‐Bin Yao
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2024-02-13
卷期号:7 (4): 4474-4480
被引量:1
标识
DOI:10.1021/acsanm.3c06211
摘要
Mixed halide perovskite nanocrystals show great promise for high-performance light-emitting diodes (LEDs) due to their tunable band gaps, high photoluminescence efficiency, and excellent color purity. However, one major challenge in using mixed halide CsPbBrxCl3–x NCs for pure blue LEDs is the instability of their electroluminescence (EL) caused by halide segregation. Here, we report an effective pseudohalide tetrafluoroborate (BF4–) passivation approach to improve the EL stability of CsPbBrxCl3–x NC-based LEDs. Our approach involves the solution-processed treatment of CsPbBrxCl3–x NCs by the complex of tributylphosphine oxide and calcium tetrafluoroborate, which yields pseudohalide BF4–-passivated CsPbBrxCl3–x NCs. The BF4– fills the surface halide ion vacancy, providing dual benefits of surface passivation and halide migration suppression. By using these BF4–-passivated CsPbBrxCl3–x NCs as the emitting layer, we have successfully fabricated spectrally stable and pure blue LEDs with an emission peak at 468 nm, a maximum luminance of 275 cd/m2, and a maximum external quantum efficiency of 3.2%. Our proposed BF4–-passivated NCs strategy will pave the way for the development of efficient, stable, and pure blue perovskite LEDs.
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