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. CsPbBr 3 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 CsPbBr 3 PQDs embedded in tellurite glass matrix can overcome existing instability limitation and provide full potential of PQDs in practical photonic and opto-electronic applications. [Display omitted] • Cubic CsPbBr 3 PQDs are successfully precipitated in tungsten tellurite glass matrix. • Emission color is the result of band gap regulation by controlled heat treatment. • Glass rigid structure protects PQDs from the environment for long-term durability. • CsPbBr 3 PQDs exhibit impressive fluorescence after 120 days of water immersion. • PQDs embedded GNCs are promising materials for opto-electronic applications. [ABSTRACT FROM AUTHOR]