1：Experimental Design and Method Selection:

The study used a solid-state synthesis method to prepare Mn2+ doped Sr2MgAl22O36 powders, with characterization via XRD, SEM, EDS, FTIR, UV-vis spectroscopy, photoluminescence measurements, thermal stability tests, and LED device fabrication. Theoretical models included Kubelka-Munk equations for band gap calculation and Arrhenius equation for activation energy.

2：Sample Selection and Data Sources:

Samples were synthesized with varying Mn2+ concentrations (5% to 45%), using raw materials like SrCO3, Mg(OH)2·4MgCO3·5H2O, Al2O3, MnCO3, and BaF2 as flux. Data were collected from laboratory experiments.

3：List of Experimental Equipment and Materials:

Equipment included XRD (Bruker D8 Focus), SEM (SU8010, Hitachi), FTIR spectrometer (Thermal Scientific Nicolet 6700), UV-vis spectrophotometer (UV-2550 PC, Shimadzu), fluorescence spectrometer (Fluoromax-4P, Horiba Jobin Yvon), heating equipment (TAP-02), oscilloscope (Lecroy Wave Runner 6100), tunable laser (Continuum Sunlite OPO), and quantum yield measurement system (Hamamatsu Photonics C9920-02). Materials were analytical grade chemicals.

4：2). Materials were analytical grade chemicals. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Raw materials were ground, mixed, sintered at 1400°C under reducing atmosphere, and characterized. Photoluminescence properties were measured under excitation, thermal stability was tested from 298 to 500 K, and WLEDs were fabricated by mixing phosphors with epoxy resin on blue LED chips.

5：Data Analysis Methods:

Data were analyzed using Topas software for XRD refinement, and statistical methods for fitting decay curves and calculating parameters like FWHM, color purity, and quantum yields.