Fig. 2.

Synthesis and characterization of CsPbX₃ perovskite quantum dots (PeQDs). a Transmission electron microscopy (TEM) and b high-resolution TEM images of the as-synthesized CsPbBr₃ PeQDs. The scale bars in (a) and (b) represent 100 nm and 5 nm, respectively. c Optical absorption spectra, d photoluminescence (PL) photograph (λ = 365 nm), e PL spectra (λ = 360 nm) and f PL decays of the as-synthesized CsPbX₃ PeQDs with varying halide compositions