Fig. 1. Schematic diagram of the synthesis process for CsPbBr₃ quantum dot solution

Fig. 2. XRD and XPS spectra of Al∶CsPbBr₃ quantum dots and CsPbBr₃ quantum dots. (a) XRD spectrum; (b) XPS diagram; (c) Cs 3d; (d) Pb 4f; (e) Br 3d; (f) Al 2p

Fig. 3. TEM images of Al∶CsPbBr₃ quantum dots and CsPbBr₃ quantum dots. (a) Al∶CsPbBr₃ quantum dots; (b) CsPbBr₃ quantum dots; (c) size distribution plot of Al∶CsPbBr₃ quantum dots; (d) size distribution plot of CsPbBr₃ quantum dots

Fig. 4. HRTEM image and EDS maps of Al∶CsPbBr₃ quantum dots. (a) HRTEM image; (b) Al element map; (c) Pb element map; (d) Cs element map; (e) Br element map

Fig. 5. Fluorescence (PL) and absorption spectra of CsPbBr₃ quantum dots and Al∶CsPbBr₃ quantum dots. (a) PL spectra at different Al/Pb molar ratios; (b) absorption spectra at different Al/Pb molar ratios; (c) emission linewidth of CsPbBr₃ quantum dots; (d) emission linewidth of Al∶CsPbBr₃ quantum dots; (e) PL spectra of Al∶CsPbBr₃ quantum dots compared to CsPbBr₃ quantum dots; (f) PL evolution of CsPbBr₃ quantum dots at different storage time

Fig. 6. Fluorescence intensity plots and the second-order correlation function statistical histograms of CsPbBr₃ quantum dots and Al∶CsPbBr₃ quantum dots. (a) Real-time fluorescence intensity plot of CsPbBr₃ quantum dots; (b) single-photon statistics histogram of CsPbBr₃ quantum dots under 439 nm light excitation; (c) real-time fluorescence intensity plot of Al∶CsPbBr₃ quantum dots; (d) single-photon statistical histogram of Al∶CsPbBr₃ quantum dots under 439 nm light excitation