Optical properties of CsPbX₃ (X = Br, i) quantum dots

In order to investigate the photoluminescence (PL) and the X-ray excited luminescence (XEL) characteristics of CsPbBr3 and CsPbI3 quantum dots with high effective mass (Z_eff), we synthesized CsPbBr3 and CsPbI3 quantum dots with a cubic phase by using the wet chemical method. The CsPbBr3 quantum dots had a PL peak at 522 nm and an XEL peak at 537 nm. The CsPbI3 quantum dots had a PL peak at 690 nm and an XEL peak at 711 nm. The high XEL peaks could be attributed to the high Z_eff of the CsPbBr3 and the CsPbI3 quantum dots (62.24 and 64.04, respectively). The high Z_eff might have led to the high stopping power for X-ray detection. These results show the potential of CsPbBr3 and CsPbI3 quantum dots for applications in the field of optical and X-ray detection.