Strong circularly polarized luminescence from quantum dots/2D chiral perovskites composites

手性(物理) 发光 光致发光 钙钛矿(结构) 材料科学 圆极化 自旋(空气动力学) 量子点 异质结 化学物理 光电子学 凝聚态物理 结晶学 化学 光学 物理 对称性破坏 手征对称破缺 量子力学 微带线 热力学 Nambu–Jona Lasinio模型
作者
Qingqian Wang,Hongmei Zhu,Wei Chen,Junjie Hao,Zhaojin Wang,Jun Tang,Yingguo Yang,Xiao Wei Sun,Dan Wu,Kai Wang
出处
期刊:Nano Research [Springer Science+Business Media]
卷期号:16 (5): 7593-7599 被引量:25
标识
DOI:10.1007/s12274-023-5380-0
摘要

Chiral perovskites (CPs) have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence (CPL) application and of great importance for future spin-optoelectronics. However, there is a key contradiction that in chiral perovskites chirality distorts the crystal structure, leading to poor photoluminescence (PL) properties. Achieving the balance between chirality and PL is a major challenge for strong CPL from chiral perovskites. Differently, two-dimensional (2D) chiral perovskite has shown fascinating chiral induced spin selectivity (CISS) effect which can act as spin injector under ambient conditions. Here, we propose an effective strategy to achieve high CPL activity generated from quantum dots (QDs) by introducing 2D chiral perovskite as a chiral source, providing spin polarized carriers through the CISS effect. The as-synthesized QDs/CP composites exhibit dissymmetry factors (glum) up to 9.06 × 10−3. For the first time, we performed grazing incident wide angle X-ray scattering (GIWAXS) measurements, showing the chirality originates from the distorted lattices caused by the large chiral organic cations. Besides, time-resolved PL (TR-PL) measurements verify the enhanced CPL activity should be attributed to the charge transport between two components. These findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spin-optoelectronics application.
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