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Enhancing the light-emitting performance and stability in CsPbBr3 perovskite quantum dots via simultaneous doping and surface passivation

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Abstract

Inorganic perovskite CsPbBr3 quantum dots (QDs) have emerged as a promising candidate for optoelectronic applications due to their narrow emission and color purity, among other things. However, it remains a challenge to produce QDs with the desired brightness and stability. Here, a one-step synthesis with a doping agent Co(AC)2 is demonstrated to produce CsPbBr3 QDs the photoluminescence quantum yield (PLQY) and stability of which improve to almost 90% and by over 65% to 50 days, respectively. It has been elucidated by microscopy and XRD results that the Co2+ doping optimizes the quantum dot octahedron structure, indicating more passivated QD defects. As a result, LED devices using doped CsPbBr3 QDs as the luminescent layer show about 47% improvement in luminance. We postulate that, owing to the weaker electronegativity of COO than that of Br, the electrovalent bond on Pb is stronger, resulting in the inhibition of defect formation.

Graphical abstract: Enhancing the light-emitting performance and stability in CsPbBr3 perovskite quantum dots via simultaneous doping and surface passivation

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Article information


Submitted
24 Jul 2020
Accepted
16 Sep 2020
First published
17 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Enhancing the light-emitting performance and stability in CsPbBr3 perovskite quantum dots via simultaneous doping and surface passivation

H. Yang, W. Yin, W. Dong, L. Gao, C. Tan, W. Li, X. Zhang and J. Zhang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC03510F

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