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Research Article

Stability enhancement of PbS quantum dots by site-selective surface passivation for near-infrared LED application

Xinsu Zhang1,§, Yujuan Chen1,§, Linyuan Lian2, Zizhen Zhang1, Yixuan Liu1, Li Song1, Chong Geng1( ), Jianbing Zhang2, Shu Xu1( )
Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

§ Xinsu Zhang and Yujuan Chen contributed equally to this work.

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Abstract

Infrared lead chalcogenide quantum dots (QDs) suffer fast degradation due to the easy oxidation of surface chalcogen atoms. Here, we report a trioctylphosphine-mediated surface passivation method to improve the air stability of PbS QDs. Surface mechanism study reveals an in situ surface reaction, which leads to site-selective passivation of surface S atoms with lead mono-carboxylate. The surface capping motif sufficiently protects PbS QDs from oxygen and improves their stability as well as quantum efficiency regardless of the QD size and original ligands on surface cations. The modified PbS QDs display no obvious fluorescence quenching and surface oxidization after 30 days of air exposure. The robust surface capping also provides high compatibility of PbS QDs with polymers for optoelectronic device fabrication. The near-infrared LEDs based on the modified PbS QDs display a slight degradation of only 1.47% from the maximum intensity after continuous operation in air for 250 hours (lifetime > 10,000 h) at 0.5 W/cm2 power density, indicating the surface passivation route is promising strategy for promoting practical optoelectronic application of PbS QDs

Keywords

PbSquantum dotsurface modificationstabilitylight-emitting diode

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Nano Research
Volume 14 Issue 3,
March 2021
Pages 628-634
DOI: 10.1007/s12274-020-3081-5
Cite this article:
Zhang X, Chen Y, Lian L, et al. Stability enhancement of PbS quantum dots by site-selective surface passivation for near-infrared LED application. Nano Research, 2021, 14(3): 628-634. https://doi.org/10.1007/s12274-020-3081-5
Topics:
Infrared devices IVLigands NanocrystalsOptoelectronic devicesOrganic light emitting diodes (OLED) Semiconductor quantum dotsVI semiconductors

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Received: 16 June 2020
Revised: 28 August 2020
Accepted: 29 August 2020
Published: 01 March 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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