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Narrow-Band Violet-Light-Emitting Diodes Based on Stable Cesium Lead Chloride Perovskite Nanocrystals
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-15 , DOI: 10.1021/acsenergylett.1c01380
Congyang Zhang 1 , Qun Wan 2 , Luis K. Ono 1 , Yuqiang Liu 1 , Weilin Zheng 2 , Qinggang Zhang 2 , Mingming Liu 2 , Long Kong 2 , Liang Li 2 , Yabing Qi 1
Affiliation  

CsPbCl3 nanocrystals are potential ultrapure emitters. But it is challenging to synthesize CsPbCl3 nanocrystals with sufficient stability, which impedes their application in light-emitting devices. In this work, we report a facile phosphoryl-chemistry-mediated synthesis approach to synthesizing stable CsPbCl3 nanocrystals, in which the phenylphosphonic dichloride (PhPOCl2) precursor is employed. In addition to the high reactivity of the P–Cl bond of PhPOCl2 for providing adequate Cl, the derived P=O with good proton affinity facilitates the formation of a distinct nanocrystal surface with the nonprotonated oleylamine (OLA) ligand. Accordingly, the L-type-ligand-capped CsPbCl3 nanocrystals exhibited not only bright luminance but also good stability that endured repeated purification up to 10 cycles. Based on the stable CsPbCl3 nanocrystals, we achieved violet LEDs with extremely narrow electroluminescence spectra (full width at half-maximum ≈ 10.6 nm).

中文翻译:

基于稳定的氯化铯铅钙钛矿纳米晶体的窄带紫光发光二极管

CsPbCl 3纳米晶体是潜在的超纯发射体。但是合成具有足够稳定性的CsPbCl 3纳米晶体具有挑战性,这阻碍了它们在发光器件中的应用。在这项工作中,我们报告了一种简便的磷酰化学介导的合成方法来合成稳定的 CsPbCl 3纳米晶体,其中使用了苯基膦酰二氯化物 (PhPOCl 2 ) 前体。除了 PhPOCl 2的 P-Cl 键的高反应性以提供足够的 Cl 外,衍生的具有良好质子亲和力的 P=O 促进了具有非质子化油胺 (OLA) 配体的独特纳米晶体表面的形成。因此,L 型配体封端的 CsPbCl 3纳米晶体不仅表现出明亮的亮度,而且还具有良好的稳定性,可以承受长达 10 次循环的重复纯化。基于稳定的 CsPbCl 3纳米晶体,我们实现了具有极窄电致发光光谱(半高全宽≈ 10.6 nm)的紫光 LED。
更新日期:2021-10-08
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