Efficient and tunable broadband mid-infrared luminescence through energy transfer in CsPb1-x(Er/Yb/Ho)xBr3 perovskite fluoride glasses for CO2 monitoring in H2 energy

Inorganic CsPbBr3 perovskites have garnered significant attention for their excellent optoelectronic properties, particularly in the visible region. However, their great potential for mid-infrared applications has rarely been reported. In this study, we successfully synthesized CsPb1-x(Er/Yb/Ho)xBr3-ZBLAN perovskite fluoride glasses, which exhibit efficient and tunable broadband mid-infrared luminescence. We utilized this perovskite material to fabricate a detection device for measuring carbon dioxide impurity concentrations in hydrogen energy systems. By substituting the Pb2+ ions with rare earth ions Er3+/Yb3+/Ho3+, we achieved continuous tunability within the wavelength range of 2.6-3 mu m. Absorption and emission cross sections (sigma abs and sigma em) of 0. 25CsPb1-x(Er/Yb/ Ho)xBr3-ZBLAN are 3.14x10- 20 cm2 and 3.45x10- 20 cm2. These findings highlight the potential of CsPb1-x(Er/ Yb/Ho)xBr3 perovskite fluoride glasses for future applications in broadly tunable mid-infrared light emitting and laser technologies. Overall, our results demonstrate the broad utility of CsPb1-x(Er/Yb/Ho)xBr3 perovskite fluoride glass for tunable mid-infrared luminescence and laser applications.