Fig. 1. (a)-(b) TEM images of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots and their physical images irradiated by ultraviolet lamps; (c)-(d) Particle size distribution of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots; (e) Schematic diagram of the Zn ion doping principle of CsPbI₃ quantum dots; (f) XRD spectra of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots; (g) Elemental mapping of Cs, Pb, Zn, I elements in Zn:CsPbI₃ quantum dots

Fig. 2. (a) XPS spectra of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots; (b)-(d) High-resolution XPS spectra of Pb 4f, Zn 2p, I 3d of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots

Fig. 3. (a) Normalized absorption spectra and PL spectra of CsPbI₃ quantum dots with different ZnI₂/PbI₂ molar ratios; (b) PLQY of CsPbI₃ quantum dots with different ZnI₂/PbI₂ molar ratios; (c) Comparison of PL spectra of Initial CsPbI₃ and Zn:CsPbI₃ quantum dot; (d) PLQY of the Initial CsPbI₃ and Zn:CsPbI₃ quantum dots solution over time; (e) TRPL decay curves of Initial CsPbI₃ and Zn:CsPbI₃ quantum dots

Fig. 4. (a) Schematic diagram of a backlight LED device composed of Zn: CsPbI₃/PDMS, CsPbBr₃/PDMS, CsPbCl₃/PDMS color conversion film and UV LED chip; (b)-(d) Spectrum of red, green and blue LEDs and working photos; (e) Comparison of CIE chromaticity of LED devices with NTSC standards