Speaker
Description
Lead halide perovskite quantum dots (QDs) have attracted much attention for an optoelectronic application. Size dependence properties of QDs have been extensively studeied Herein, formamidinium lead halide (FAPbBr3) QDs have been successfully synthesized at room temperature under an open-air atmosphere. A different particle sizes of FAPbBr3 were rapid separated by using a differential separation method. The particle sizes of perovskite QDs were achieved in the diameter range of 20 – 200 nm. As a result, a small particle size was obtained from a high centrifugal speed. Some aggregation of QDs can be observed from the precipitation with low centrifugal speed. Photoluminescence and absorbance of size-selected perovskite QDs have been investigated. The results of photoluminescence spectra shown that a slightly blue shift and narrow full width at half-maximum of 24 nm has been observed. Thus, there are the possibility to use a convenient differential separation method for size selection of perovskite QDs applications.
Keyword: Perovskites, Quantum dots, Differential centrifugation
