Dominant non-radiative recombination in perovskite CsPbBr3-xIx quantum dots

•CsPbBr3-xIx quantum dots were synthesized with a simple method.•The time-resolved photoluminescence (TRPL) technique were used to measure the lifetime for different samples (CsPbBr3-xIx).•The incorporation of PbI2 contributes to the presence of defects in the CsPbBr3-xIx structure. Colloidal perovskite (cesium lead bromide-iodide) quantum dots (PQDs) with different iodine concentration were prepared. These PQDs show excellent optical properties with high light absorption and high photoluminescence. Light absorption is in the range between 500 and 550 nm and extending into the ultraviolet. The photoluminescence spectra show peaks from 490 to 675 nm. Charge carrier lifetime measurements, obtained with the time-resolved photoluminescence technique, indicate that the dominant mechanisms for recombination are the non-radiative recombination processes. Finally, increasing the iodine content, increases defect concentration in the PQDs.