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Chirality of CsPbBr3 Nanocrystals with Varying Dimensions in the Presence of Chiral Molecules
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2024-07-25 , DOI: 10.1021/acs.jpclett.4c01837
Antika Das 1 , Supriya Ghosal 2 , Kritiman Marjit 1 , Swapan K Pati 2 , Amitava Patra 1, 3
Affiliation  

Chiral lead halide perovskite (LHP) nanocrystals (NCs) have been attracting considerable interest for circularly polarized luminescence (CPL)-based optoelectronic applications. This study combined experimental and computational analyses to investigate how the dimensionality of 3D (cubic) to 0D (quantum dots) influences the tunable chiral emission of CsPbBr3 LHP NCs. The circular dichroism (CD) spectra have a significant blue shift from 508 to 406 nm. The dissymmetry factors for CD (gCD) change from ±2.5 × 10–3 to ±7.5 × 10–3 as dimensionality varies from 3D to 0D in the presence of the chiral molecule (cyclohexylethylamine, CHEA). A significant luminescence dissymmetry factor (glum) of ±5.6 × 10–4 is observed in the 0D CsPbBr3 NCs. Theoretical calculations using structural distortion parameters, the extent of charge transfer, and electrostatic potential profiles have revealed that the most significant enhancement of the chirality transfer occurs from the CHEA molecules to 0D NCs, and the order of chirality transfer from CHEA to CsPbBr3 NCs is 0D (quantum dots) > 2D (nanoplatelet) > 3D (cubic).

中文翻译:


手性分子存在下不同尺寸 CsPbBr3 纳米晶体的手性



手性卤化铅钙钛矿(LHP)纳米晶体(NC)在基于圆偏振发光(CPL)的光电应用中引起了极大的兴趣。本研究结合实验和计算分析,研究 3D(立方)到 0D(量子点)的维度如何影响 CsPbBr 3 LHP NC 的可调手性发射。圆二色性 (CD) 光谱在 508 至 406 nm 之间有显着的蓝移。当存在手性分子(环己基乙胺,CHEA)时,维数从 3D 变为 0D,CD ( g CD ) 的不对称因子从 ±2.5 × 10 –3变为 ±7.5 × 10 –3 。在 0D CsPbBr 3 NC 中观察到显着的发光不对称因子 ( g lum ) ±5.6 × 10 –4 。使用结构畸变参数、电荷转移程度和静电势分布的理论计算表明,手性转移最显着的增强发生在从CHEA分子到0D NCs的过程中,并且从CHEA分子到CsPbBr 3 NCs的手性转移顺序为0D(量子点)> 2D(纳米片)> 3D(立方)。
更新日期:2024-07-25
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