Ag-CsPbBr3 quantum dots/PMMA composite film for tunable white light emitting diodes

Abstract We demonstrated a colloidal perovskite Ag-CsPbBr3 quantum dots /PMMA (Ag-CsPbBr3 CPQDs/PMMA) composite film. Compared to the traditional CsPbBr3 CPQDs, the Ag-CsPbBr3 CPQDs exhibits two advantages: i) enhanced photoluminescence (PL) emission intensity approaching 40%; ii) up to 94% of photoluminescence quantum yield (PLQY). More importantly, the polymethylmethacrylate (PMMA) film makes the Ag-CsPbBr3 CPQDs/PMMA film still have a 56% of PLQY and high PL emission intensity at a storage time of 5 months. And through changing the ratio of CsPbI3 CPQDs in the Ag-CsPbBr3 CPQDs, the Ag-CsPbBr3 CPQDs/PMMA film can easily tune the correlated color temperature (CCT) from cold to warm light.