1：Experimental Design and Method Selection:

A solvothermal method was used to coat SiO2 on CdSe/CdS/ZnS:Al QDs by thermally forcing the decomposition of tetraethyl orthosilicate (TEOS) in toluene. Oleylamine (OAm) was used as a surfactant to prevent QDs from aggregating and to accelerate the reaction rate.

2：Sample Selection and Data Sources:

CdSe/CdS/ZnS:Al QDs were chosen as a model system for coating due to their better thermal stability compared to undoped CdSe/CdS/ZnS QDs.

3：List of Experimental Equipment and Materials:

Chemicals included cadmium oxide (CdO), zinc acetate (Zn(Ac)2), aluminum isopropoxide, 1-dodecanethiol (DDT), oleic acid (OA), oleylamine (OAm), 1-octadecene (ODE), selenium (Se), trioctylphosphine (TOP), tetraethyl orthosilicate (TEOS), and toluene. Equipment included a Tecnai G2 SpiritBiotwin TEM, FEI Talos F200X TEM, Cary-60 UV-Vis spectrophotometer, Hitachi F-380 fluorescence spectrophotometer, Bruker D8 ADVANCE X-ray diffractometer, Thermo Nicolet 6700 spectrometer, and Kratos Axis Ultra-DLD XPS.

4：Experimental Procedures and Operational Workflow:

The CdSe/CdS/ZnS:Al QDs were synthesized and then coated with SiO2 by adding TEOS and OAm to the QDs toluene solution, degassing with N2, and sealing in a Teflon lined stainless steel autoclave. The autoclave was heated to 100-150 °C for 0.5-2.5 h to force the decomposition of TEOS.

5：5-5 h to force the decomposition of TEOS. Data Analysis Methods:

5. Data Analysis Methods: The PLQY was measured using a fluorescence spectrometer with an integrated sphere. Photostability was tested under continuous illumination with a 450 nm LED light, and thermal stability was recorded by an ocean optical spectrometer.