Fig. 1. XRD patterns of CsPbBr₃ and Sn-doped CsPbBr₃ QDs

Fig. 2. Absorption spectra and photoluminescence spectroscopy of CsPbBr₃ and Sn-doped CsPbBr₃ QDs. (a) Absorption spectra; (b) photoluminescence spectroscopy

Fig. 3. Photoluminescence decay curves of CsPbBr₃ and Sn-doped CsPbBr₃ QDs

Fig. 4. TEM images and particle size distributions. (a) TEM image of CsPbBr₃ QDs; (b) TEM image of CsPb_0.9Sn_0.1Br₃ QDs; (c) particle size distribution of CsPbBr₃ QDs; (d) particle size distribution of CsPb_0.9Sn_0.1Br₃ QDs

Fig. 5. Photofluorogram of CsPb_0.9Sn_0.1Br₃ and CsPbBr₃ QDs under UV light irradiation (365 nm)

Fig. 6. Schematic of Al/LiF/TPBi/QDs/PVK/PEDOT∶PSS/ITO quantum dot light emitting diodes vertical stack structure

Fig. 7. Electroluminescence performance of QLED.(a) Electroluminescence spectra of Al/LiF/TPBi/CsPbBr₃/PVK/PEDOT∶PSS/ITO device at different voltages; (b) electroluminescence spectra of Al/LiF/TPBi/CsPb_0.9Sn_0.1Br₃/PVK/PEDOT∶PSS/ITO device at different voltages; (c) current density-voltage curves; (d) luminance-voltage curves

Fig. 8. CIE coordinates of CsPbBr₃ QLED and Sn-doped CsPb_0.9Sn_0.1Br₃ QLED

Table 1. Fitting results fitted by photoluminescence decay curves and PLQY of CsPbBr₃ and Sn-doped CsPbBr₃ QDs