1：Experimental Design and Method Selection:

Eu3+-doped CsPbBr3 glass ceramic (EGC) samples were synthesized by a melting-quenching route and subsequent crystallization (heat-treatment). The glass matrix and perovskite-related components were designed with molar compositions of 35B2O3‐35SiO2‐15ZnO-9Cs2CO3-3PbBr2-3NaBr-xEu2O3 (0.1-4.0 mol%).

2：1-0 mol%). Sample Selection and Data Sources:

2. Sample Selection and Data Sources: The raw materials of B2O3(99.9%), SiO2(99.99%), ZnO(99.9%), Cs2CO3(99.99%), PbBr2(99.9%), NaBr(99.99 %), and high purity Eu2O3(99.99 %) were well mixed and grounded into powders with an agate mortar and pestle.

3：9%), SiO2(99%), ZnO(9%), Cs2CO3(99%), PbBr2(9%), NaBr(99 %), and high purity Eu2O3(99 %) were well mixed and grounded into powders with an agate mortar and pestle. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Alumina crucible, stainless steel plate, brass plate, muffle furnace, X-ray diffractometer (D8ADVANCE/Germany Bruker), transmission electron microscopy (TEM) and high-resolution field transmission electron microscopy (HRTEM) using U.S. FEI TecnaiG2 F20 operating at 200 kV, fluorescence spectrophotometer (HITACHI F-7000), spectrophotometer (FLAME-S-XR1-ES), UV-Vis spectrophotometer (Model HITACHI U-4100), time-resolved fluorescence spectrophotometer (FLS920, Edinburgh Instrument Ltd), thermogravimetric analyzer (TGA, Pyris 1 TGA, Per-kin-Elmer).

4：Experimental Procedures and Operational Workflow:

The well-ground stoichiometric compounds were put into an alumina crucible and melted at 1200 °C for 15 min in air atmosphere. After that, the melt was poured into a 400 °C preheated stainless steel plate and then pressed by another brass plate to form precursor glass. Subsequently, the glasses were annealed in a muffle furnace at 400 °C for 3 hours to release the thermal stress, precursor glasses (labeled as PG) were formed. Moreover, the pre-obtained PG was heat-treated for 22 h at 500 °C to form a transparent glass ceramic (labeled as GC). Finally, samples were optical polished or grounded into powders for further characterization and usage.

5：Data Analysis Methods:

The phase of obtained samples were identified via XRD measurement. The microstructures of GCs were analyzed by TEM and HRTEM. The photo-luminescence excitation (PLE) and photo-luminescence (PL) spectra were measured with a fluorescence spectrophotometer. The UV-Vis transmittance spectra and absorption spectra were recorded in the wavelength range from 200 to 800 nm. The decay curves of EGC were recorded by a time-resolved fluorescence spectrophotometer. Thermostability was investigated by thermogravimetric analyzer.