Photo-/electro-luminescence enhancement of CsPbX3 (X = Cl, Br, or I) perovskite quantum dots via thiocyanate surface modification
Journal
Journal of Materials Chemistry C
Journal Volume
8
Journal Issue
3
Pages
1065-1071
Date Issued
2020
Author(s)
Abstract
All-inorganic lead halide perovskite quantum dots (PQDs) are among the most highly applicable luminescent materials for wide-color-gamut displays. Since the development of all-inorganic PQDs, several methods have been implemented to enhance their photo-luminescence quantum yield (PLQY) and stability. However, most treatment procedures only focus on optimizing the green CsPbBr3 perovskite quantum dots. In this work, we extended the usage of SCN- ligands to modify the surface of blue, green, and red PQDs for improving their luminescence properties. The presence of SCN- on the surface of PQDs was confirmed via Fourier-transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. On the basis of the X-ray photoelectron spectra, the surface modification of PQDs enhanced the PL intensity and PLQY due to the removal of Pb2+ surface defects. The modified PQDs were applied to quantum dot light-emitting diodes (QLEDs), and the performance of the devices was satisfactory, thereby indicating their potential application in high-quality displays. ? 2020 The Royal Society of Chemistry.
Subjects
Bromine compounds; Cesium compounds; Display devices; Energy dispersive spectroscopy; Fourier transform infrared spectroscopy; Lead compounds; Luminescence; Nanocrystals; Organic light emitting diodes (OLED); Perovskite; Photoelectron spectroscopy; Semiconductor quantum dots; Surface defects; Energy dispersive X ray spectroscopy; Halide perovskites; High quality; Luminescence properties; Luminescent material; Quantum-dot light emitting diodes; Wide color gamut; X ray photoelectron spectra; Image enhancement
SDGs
Type
journal article