Rapid synthesis and theoretical analysis of CH3NH3Pb1-xCdxBr3 perovskite quantum dots for backlight LEDs: A step towards enhanced stability
Journal
Organic Electronics
Journal Volume
102
Date Issued
2022
Author(s)
Abstract
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. ? 2022
Subjects
Backlight
Color purity
LEDs
Perovskite Quantum Dots
Stability
Chelation
Lead compounds
Nanocrystals
Perovskite
Perovskite solar cells
Positive ions
Sols
Enhanced stability
Lightemitting diode
Optoelectronics property
Partial cations
Perovskite quantum dot
Potential ligand
Rapid synthesis
Synthesis method
Semiconductor quantum dots
SDGs
Type
journal article