1：Experimental Design and Method Selection:

The phosphor was synthesized by the high-temperature solid-state technique. The phase, crystal structure, photoluminescence properties, thermal stability, and decay curves were studied.

2：Sample Selection and Data Sources:

Samples of Sr2Lu1?xTaO6:xSm3+ (x = 0.008, 0.01, 0.03, 0.05, 0.07, 0.09 and 0.12) phosphors were prepared using SrCO3, Ta2O5, Lu2O3, Sm2O3, and H3BO3 as raw materials.

3：008, 01, 03, 05, 07, 09 and 12) phosphors were prepared using SrCO3, Ta2O5, Lu2O3, Sm2O3, and H3BO3 as raw materials. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: X-ray diffraction (XRD) patterns were checked on a D2 PHASER (Bruker, Karlsruhe, Germany). The morphology was detected by a field emission scanning electron microscope (SEM, Hitachi, S-4800, Japan). The excitation and emission spectra were carried out by Hitachi F-7000 spectrophotometer. The luminescence decay curves were measured by a spectro-fluorometer (HORIBA, JOBIN-YVON FL3-21).

4：1). Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The starting materials were weighed, ground, calcined in air at 1300 °C for 6 h, and then cooled to room temperature.

5：Data Analysis Methods:

The crystal structure was analyzed using XRD. The luminescence properties were analyzed using spectrophotometry. The thermal stability was evaluated by temperature-dependent luminescence properties.