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Research Article

Highly bright and low turn-on voltage CsPbBr3 quantum dot LEDs via conjugation molecular ligand exchange

Guopeng Li1, Jingsheng Huang2, Yanqing Li2, Jianxin Tang2( ), Yang Jiang1( )
School of Materials Science and Engineering,Hefei University of Technology,Hefei,230009,China;
Institute of Functional Nano & Soft Materials (FUNSOM),Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University,Suzhou,215123,China;
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Abstract

All-inorganic CsPbBr3 perovskite quantum dots (QDs) hold great promise as candidate materials for next-generation electroluminescent displays owing to their excellent optoelectronic properties. However, the long insulating ligands on the surface of CsPbBr3 QDs originating from the synthesis process hinder the fabrication of high-performance optoelectronic devices. Herein, an efficient ligand-exchange route is proposed with the use of perovskite-precursor-based halide ligands, including a series of phenalkylammonium bromides with a π-conjugation benzene ring and different branch lengths. Based on the ligand-exchange method, the conductivity of the CsPbBr3 QD layer is significantly improved owing to ligand shortening and the insertion of the π-conjugation benzene ring. As a result, high brightness (up to 12, 650 cd/m2) and low turn-on voltage (as low as 2.66 V) can be realized in CsPbBr3 QD light-emitting diodes (QLEDs), leading to dramatic improvements in device performance with a current efficiency of 13.43 cd/A, power efficiency of 12.05 lm/W, and external quantum efficiency of 4.33%.

Keywords

CsPbBr3 quantum dotsperovskitelight-emitting diodesligand exchangeπ-conjugation

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Nano Research
Volume 12 Issue 1,
January 2019
Pages 109-114
DOI: 10.1007/s12274-018-2187-5
Cite this article:
Li G, Huang J, Li Y, et al. Highly bright and low turn-on voltage CsPbBr3 quantum dot LEDs via conjugation molecular ligand exchange. Nano Research, 2019, 12(1): 109-114. https://doi.org/10.1007/s12274-018-2187-5
Topics:
Bromine compoundsLead compoundsLigands Light emitting diodes NanocrystalsOptoelectronic devicesOrganic light emitting diodes (OLED) PerovskiteSemiconductor quantum dots

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Received: 16 May 2018
Revised: 23 August 2018
Accepted: 25 August 2018
Published: 11 September 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018
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