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0D Cs3 Cu2 X5 (X = I, Br, and Cl) Nanocrystals: Colloidal Syntheses and Optical Properties.
Small ( IF 13.0 ) Pub Date : 2019-12-13 , DOI: 10.1002/smll.201905226
Zhishan Luo 1, 2 , Qian Li 1, 2 , Liming Zhang 1 , Xiaotong Wu 1 , Li Tan 1 , Chao Zou 1 , Yejing Liu 1 , Zewei Quan 1
Affiliation  

0D lead-free metal halide nanocrystals (NCs) are an emerging class of materials with intriguing optical properties. Herein, colloidal synthetic routes are presented for the production of 0D Cs3 Cu2 X5 (X = I, Br, and Cl) NCs with orthorhombic structure and well-defined morphologies. All these Cs3 Cu2 X5 NCs exhibit broadband blue-green photoluminescence (PL) emissions in the range of 445-527 nm with large Stokes shifts, which are attributed to their intrinsic self-trapped exciton (STE) emission characteristics. The high PL quantum yield of 48.7% is obtained from Cs3 Cu2 Cl5 NCs, while Cs3 Cu2 I5 NCs exhibit considerable air stability over 45 days. Intriguingly, as X is changed from I to Br and Cl, Cs3 Cu2 X5 NCs exhibit a continuous redshift of emission peaks, which is contrary to the blueshift in CsPbX3 perovskite NCs.

中文翻译:

0D Cs3 Cu2 X5(X = I,Br和Cl)纳米晶体:胶体合成和光学性质。

0D无铅金属卤化物纳米晶体(NCs)是一类新兴的具有吸引人的光学性能的材料。在此,提出了胶体合成路线,用于生产正交晶结构和形态明确的0D Cs3 Cu2 X5(X = I,Br和Cl)NC。所有这些Cs3 Cu2 X5 NC均在445-527 nm范围内显示宽带蓝绿色光致发光(PL)发射,并具有较大的斯托克斯位移,这归因于其固有的自陷激激子(STE)发射特性。从Cs3 Cu2 Cl5 NCs获得48.7%的高PL量子产率,而Cs3 Cu2 I5 NCs在45天内表现出相当高的空气稳定性。有趣的是,随着X从I变为Br和Cl,Cs3 Cu2 X5 NCs呈现出连续的发射峰红移,这与CsPbX3钙钛矿NCs中的蓝移相反。
更新日期:2020-01-23
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