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Research Article

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

Qingqian Wang1,§, Hongmei Zhu1,§, Wei Chen2, Junjie Hao1, Zhaojin Wang1, Jun Tang3, Yingguo Yang4, Xiao Wei Sun1, Dan Wu3( ), Kai Wang1( )
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China
College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201210, China

§ Qingqian Wang and Hongmei Zhu contributed equally to this work.

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Graphical Abstract

Chiral perovskite (CP) is acting as spin electron source in the quantum dots (QDs)/CP composite. When excited by ultraviolet (UV) light, the spin-polarized electrons transport from chiral perovskite to QDs and recombine in QDs. As a result, strong circularly polarized light is emitted from the composite.

Abstract

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.

Keywords

circularly polarized luminescencecolloidal quantum dotstwo-dimensional (2D) chiral perovskitesgrazing incident wide angle X-ray scattering (GIWAXS)chiral induced spin selectivity

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7593-7599
DOI: 10.1007/s12274-023-5380-0
Cite this article:
Wang Q, Zhu H, Chen W, et al. Strong circularly polarized luminescence from quantum dots/2D chiral perovskites composites. Nano Research, 2023, 16(5): 7593-7599. https://doi.org/10.1007/s12274-023-5380-0
Topics:
LightLight emission Light emitting diodes Light sourcesLuminescenceOptoelectronic devicesPerovskitePhotons

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Received: 18 September 2022
Revised: 15 November 2022
Accepted: 04 December 2022
Published: 21 January 2023
© Tsinghua University Press 2023
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