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

Authors :
Yang, Hengxiang
Yin, Wenxu
Dong, Wei
Gao, Long
Tan, Ching-Hong
Li, Wubo
Zhang, Xiaoyu
Zhang, Jiaqi
Source :
Journal of Materials Chemistry C; 11/7/2020, Vol. 8 Issue 41, p14439-14445, 7p
Publication Year :
2020

Abstract

Inorganic perovskite CsPbBr<subscript>3</subscript> 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)<subscript>2</subscript> is demonstrated to produce CsPbBr<subscript>3</subscript> 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 Co<superscript>2+</superscript> doping optimizes the quantum dot octahedron structure, indicating more passivated QD defects. As a result, LED devices using doped CsPbBr<subscript>3</subscript> QDs as the luminescent layer show about 47% improvement in luminance. We postulate that, owing to the weaker electronegativity of COO<superscript>−</superscript> than that of Br<superscript>−</superscript>, the electrovalent bond on Pb is stronger, resulting in the inhibition of defect formation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507526
Volume :
8
Issue :
41
Database :
Complementary Index
Journal :
Journal of Materials Chemistry C
Publication Type :
Academic Journal
Accession number :
146704234
Full Text :
https://doi.org/10.1039/d0tc03510f