Size-controlled fluorescence of long-term durable CsPbBr₃ perovskite quantum dots in tungsten tellurite glasses

Inorganic perovskite quantum dots (PQDs) have been regarded as attractive materials in various optoelectronic fields due to their excellent optical properties, however, the high sensitivity to moisture, temperature and radiation has put a limit for their real long-term application, and a more stable host is indispensable. CsPbBr₃ PQDs with high stability and excellent luminescence properties are successfully embedded in tellurite-based glasses by one-step melting and subsequent heat treatment. Pure cubic structure PQDs with the radius of 2.5–5.5 nm are proved to disperse evenly in the glass matrix. Thermal and cold cycles, long-term radiation and humidity exposure have illustrated its stability and confirmed the effectiveness of the designed glass system. The high photoluminescence intensity, wide wavelength tunability of 470–508 nm and narrow band-width emission of 31.8–36.6 nm with the tunable optical band gap 2.44–2.51 eV have demonstrated its excellence as the optoelectronic materials. These results demonstrate that CsPbBr₃ PQDs embedded in tellurite glass matrix can overcome existing instability limitation and provide full potential of PQDs in practical photonic and opto-electronic applications.