Incorporation of Cesium ions in FAPbBr3 quantum dots: Spectroscopic characterization for light-emitting application

Abstract

BackgroundHybrid perovskite quantum dots (PQDs) are the good light harvesters due to their outstanding optical and electrical properties, which, aroused great interest of scientists in perovskite materials now a day. But FAPbBr3 PQDs still suffering due to lower stability, complicated synthesis process and lower color gamut of devices. MethodsFA1-xCsxPbBr3 PQDs were fabricated via the rapid ligand-assisted reprecipitation processes thru the variation in the concentrations of cesium (Cs+) ions from 0 to 100 mol%. Significant findingsTo overcome the stability issues, Cs+ was incorporated into FAPbBr3 PQDs that demonstrated distinctive PL emission peak shifting towards the blue region. FA1-xCsxPbBr3 PQDs doped with 80 mol% of Cs+ ions showed a high color purity of 88% as well as a photoluminescence quantum yield (PLQY) of 85%. Moreover, FA1-xCsxPbBr3 PQDs doped with 80 mol% of Cs+ ions exhibited good environmental stability in the ambient conditions. The color gamut of the synthesized white light-emitting devices fabricated with FA1-xCsxPbBr3 PQDs at cesium concentrations of 80 mol% was 118% of the NTSC. The present research indicated that the incorporation of cesium ions in FAPbBr3 PQDs was an effective method to prepare PQDs with a high PLQY, color gamut, narrow bandwidth emission, good environmental stability.