1：Experimental Design and Method Selection:

The Pr(BO2)3 crystal was grown by a flux method using 3Li2CO3-2H3BO3 flux. The absorption spectrum, emission spectrum, and luminescence lifetime were measured.

2：Sample Selection and Data Sources:

Polycrystalline Pr(BO2)3 was synthesized by the high-temperature solid-state reaction.

3：List of Experimental Equipment and Materials:

Bruker AXS D8 Advance X-ray diffractometer, Field Emission Scanning Electron Microscopy (FESEM, Hitachi S-4800), Perkin Elmer Diamond TG/DTA simultaneous thermal analyzer, Raman spectrometer (JY, LabRAM HR 800), Hitachi U-3500 UV–vis–NIR spectrometer, TRIAX550 spectrophotometer, Edinburgh Instruments FLS920 spectrophotometer.

4：Experimental Procedures and Operational Workflow:

The crystal growth involved melting and superheating raw materials in a platinum crucible, followed by slow cooling. Physical and optical properties were characterized.

5：Data Analysis Methods:

Judd–Ofelt theory was used to calculate spectrum parameters. First-principles calculations were performed to investigate the electronic structure and optical properties.