1：Experimental Design and Method Selection:

The study involved growing undoped and Eu-doped BaBrI crystals using Bridgman and Czochralski techniques to control F-center types. Optical absorption, thermally stimulated luminescence (TSL), and photostimulated luminescence (PSL) measurements were conducted over a temperature range of 7-300 K. Ab initio calculations using Gaussian 03 with embedded cluster approach and TD DFT method were performed to model F-center absorption spectra.

2：Sample Selection and Data Sources:

Crystals were grown with different concentrations of Eu ions (e.g., 0.05 mol.% and 1 mol.%) and undoped samples. Some crystals were grown with an imbalance in bromine/iodine ratio to favor F(I) centers. Samples were irradiated using x-rays from a Pd tube or 185 nm light from a Hg-lamp.

3：05 mol.% and 1 mol.%) and undoped samples. Some crystals were grown with an imbalance in bromine/iodine ratio to favor F(I) centers. Samples were irradiated using x-rays from a Pd tube or 185 nm light from a Hg-lamp. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment includes Perkin Elmer Lambda 950 spectrophotometer for absorption spectra, x-ray source (Pd tube at 40 kV, 40 mA), low-pressure Hg-lamp (30 W) for photo-coloring, vacuum cold-finger cryostat for TSL and PSL measurements, SDL-1 grating monochromator with Hamamatsu photomodule H10721-04 for PSL detection, MDR2 grating monochromator for PSL excitation, 150 W halogen lamp, Janis Research CCS-100/204N cryocooler for TSL with linear heating at 1 K/min, and Gaussian 03 software for calculations. Materials include BaBrI crystals, Eu dopant, argon atmosphere, glassy carbon crucible.

4：Experimental Procedures and Operational Workflow:

Crystals were grown, irradiated at specific temperatures (e.g., 77 K for PSL, 7 K for TSL), and measured. Absorption spectra were recorded after irradiation. TSL glow curves were measured during heating. PSL was excited and detected with monochromators. Calculations were done to simulate F-center spectra.

5：Data Analysis Methods:

Data analysis included fitting TSL peaks with kinetic models, estimating trap depths, calculating energy transfer radii using dipole-dipole theory, and comparing experimental and calculated absorption spectra.