Wide range tuning of the size and emission color of CH3NH3PbBr3 quantum dots by surface ligands

Organic-inorganic halide perovskite CH3NH3PbX3 (X= I, Br, Cl) quantum dots (QDs) possess the characters of easy solution-process, high luminescence yield, and unique size-dependent optical properties. In this work, we have improved the nonaqueous emulsion method to synthesize halide perovskite CH3NH...

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Bibliographic Details
Published in:AIP advances 2017-08, Vol.7 (8), p.085217-085217-6
Main Authors: Fang, Xin, Zhai, Wenhao, Zhang, Kun, Wang, Yilun, Yao, Li, Tian, Cheng, Wan, Yi, Hou, Ruixiang, Li, Yanping, Chen, Weixi, Ran, Guangzhao
Format: Article
Language:English
Subjects:
Optical properties
Optoelectronic devices
Perovskites
Photoluminescence
Quantum dots
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Summary:Organic-inorganic halide perovskite CH3NH3PbX3 (X= I, Br, Cl) quantum dots (QDs) possess the characters of easy solution-process, high luminescence yield, and unique size-dependent optical properties. In this work, we have improved the nonaqueous emulsion method to synthesize halide perovskite CH3NH3PbBr3 QDs with tunable sizes. Their sizes have been tailored from 5.29 to 2.81 nm in diameter simply by varying the additive amount of surfactant, n-octylamine from 5 to 120 μL. Correspondingly, the photoluminescence (PL) peaks shift markedly from 520 nm to very deep blue, 436 nm due to quantum confinement effect. The PL quantum yields exceed 90% except for the smallest QDs. These high-quality QDs have potential to build high-performance optoelectronic devices.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4994995