Rapid synthesis and theoretical analysis of CH3NH3Pb1-xCdxBr3 perovskite quantum dots for backlight LEDs: A step towards enhanced stability

Colloidal CH3NH3Pb1-xCdxBr3 perovskite quantum dots (PQDs) have shown potential for the development of new solar cell and light-emitting diodes due to their enhanced optoelectronic properties. Here, we have reported a potential ligand-assisted room temperature rapid synthesis method for partial cati...

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Bibliographic Details
Published in:Organic electronics 2022-03, Vol.102, p.106444, Article 106444
Main Authors: Lu, Chung-Hsin, Singh, Rajan Kumar, Chen, Ting- Yu, Som, Sudipta, Kumar, Rajesh, Lu, Shao An, Meena, Mohan Lal
Format: Article
Language:English
Subjects:
Backlight
Color purity
LEDs
Perovskite Quantum Dots
Stability
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Summary:Colloidal CH3NH3Pb1-xCdxBr3 perovskite quantum dots (PQDs) have shown potential for the development of new solar cell and light-emitting diodes due to their enhanced optoelectronic properties. Here, we have reported a potential ligand-assisted room temperature rapid synthesis method for partial cation exchange in colloidal CH3NH3Pb1-xCdxBr3 PQDs, where exchange of Pb2+ takes place for various similar cations, which result in doped CH3NH3Pb1-xCdxBr3 maintaining its original PQDs shape and structure. There was lattice contraction was observed into the Cd doped perovskite. A blue shift in optical spectra was observed due to partial Pb2+ exchange in place of Cd2+, however high photoluminescence quantum yields, sharp absorption features, and narrow emission of the original CH3NH3Pb1-xCdxBr3 PQDs remained the nearly same. XPS study confirmed the incorporation of Cd2+ ions in the place of Pb2+. Theoretical analysis was also performed to study the different structural and optical aspects of the doped perovskite samples. Furthermore, a prototype perovskite QDs based white LEDs was fabricated that have a higher color gamut. The current work presents a new possibility to develop stable PQDs with enhancing optoelectronic properties. [Display omitted] •Rapid perovskite quantum dot synthesis within 30 min.•Cd incorporation enhanced the stability and performance of PQDs.•Theoretical and experimental investigation of Cd: MAPbBr3 PQDs.•High color purity, PLQY, and intense PQDs enhanced thin films.•Backlight LEDs with high color gamut.
ISSN:1566-1199
1878-5530
DOI:10.1016/j.orgel.2022.106444