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Nano Research 2023, 16(5): 7593-7599 https://doi.org/10.1007/s12274-023-5380-0
Research Article | Issue | Published: 21 January 2023

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

Show Author's Information 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.

Keywords:
colloidal quantum dots, circularly polarized luminescence, chiral induced spin selectivity, two-dimensional (2D) chiral perovskites, grazing incident wide angle X-ray scattering (GIWAXS)
Topics:
LightLight emission Light emitting diodes Light sourcesLuminescenceOptoelectronic devicesPerovskitePhotons
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
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Abstract Full text Electronic supplementary material About this article

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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Electronic supplementary material
About this article

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

Show Author's information 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.

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: colloidal quantum dots, circularly polarized luminescence, chiral induced spin selectivity, two-dimensional (2D) chiral perovskites, grazing incident wide angle X-ray scattering (GIWAXS)

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Publication history
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Acknowledgements

Publication history

Received: 18 September 2022
Revised: 15 November 2022
Accepted: 04 December 2022
Published: 21 January 2023
Issue date: May 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by Guangdong Basic and Applied Basic Research Foundation (Nos. 2022A1515011071, 2019A1515111093, and 2022A1515011614), the National Natural Science Foundation of China (Nos. 62122034, 61875082, 61905107, 62204107, and 62205138), Innovation Project of Department of Education of Guangdong Province (No. 2019KTSCX157), and Shenzhen Innovation Project (Nos. JCYJ20210324104413036 and JCYJ20190809152411655). Q. Q. W. and H. M. Z. acknowledge the support from China Postdoctoral Science Foundation (Nos. 2021M691397 and 2021M691411). The authors acknowledge Shanghai Synchrotron Radiation Facility for the GIWAXS measurements. The authors acknowledge Shiyanjia Lab (www.shiyanjia.com) for the UPS and TAS experiments.

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