Understanding the mechanism of enhanced stability of mixed-halide perovskite nanocrystals with dimethylammonium for pure-red light emitting diodes
CsPbI3-xBrx perovskite nanocrystals (NCs) are ideal emissive materials that can be tuned to emit pure-red colour (620-650 nm) used as the standard for ultrahigh definition displays. While these mixed-halide NCs can exhibit high photoluminescence quantum efficiency (approaching 90%), their photostability under ambient and elevated temperatures is inferior. In this study, we have demonstrated the beneficial impact of dimethylammonium (DMA) in extending the stability of these nanocrystals synthesized using the ligand-assisted re-precipitation (LARP) method in air. By conducting XPS measurements, we aim to obtain a chemical signature of possible DMA incorporation in the lattice of mixed-halide perovskite NCs, which will advance our understanding on the mechanism of improved stability in these systems. For eventual application in LEDs, we will also use UPS measurements for determining their work function and band edge energies for ensuring appropriate band alignment in the final device.
Status: Ongoing
Date of proposal: 31/05/2023
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