1：Experimental Design and Method Selection:

The study involved the synthesis of Bi-doped Cs2SnCl6 and Mn-doped CsPbCl3 QDs using hydrothermal reaction and hot injection methods, respectively. The WLED was fabricated by coating these materials onto a UV-LED chip.

2：Sample Selection and Data Sources:

Materials included cesium carbonate, lead (II) chloride, cesium chloride, oleic acid, 1-octadecene, manganese chloride tetrahydrate, oleylamine, tin chloride, bismuth chloride, and polymethyl methacrylate.

3：List of Experimental Equipment and Materials:

Equipment included a three-neck flask, Teflon-lined autoclave, Ocean Optics spectrometer, Shimadzu UV-2550 spectrophotometer, Edinburgh FLS920 spectrometer, FEI Tecnai G2 Spirit TWIN transmission electron microscope, Quanta 450 FEG scanning electron microscope, and Bruker D8 Advance X-ray diffractometer.

4：Experimental Procedures and Operational Workflow:

The synthesis processes involved preparation of Cs-oleate, synthesis of Mn-doped CsPbCl3 QDs, synthesis of Bi-doped Cs2SnCl6, and fabrication of LED devices. Measurements included fluorescence emission spectra, absorbance spectra, and time-resolved PL spectroscopy.

5：Data Analysis Methods:

Data were analyzed using fluorescence spectrometer equipped with an integrating sphere and electroluminescence measurement system.