Spectral properties of CsPbX3 (X=Br, I) perovskite nanocrystals in borogermanate glass-ceramics

• Cubic CsPbI 3 perovskite nanocrystals are synthesized in borogermanate glass. • Tunable emission in 490–530 nm range of CsPbBr 3 nanocrystals is obtained. • Comparison of CsPbI 3 nanocrystals and quantum dots properties is carried out. • The maximum quantum yield value is 19% for CsPbI 3 nanocrystals. • Borogermanate glass with CsPbX 3 nanocrystals passes the chemical resistance test. Pure CsPbBr 3 and CsPbI 3 perovskite nanocrystals are nucleated in the borogermanate glass. Nanocrystals precipitation in glass are controlled via isothermal treatment at temperatures above T g by adjusting the temperature and duration starting from 15 min. X-ray diffraction data and optical measurements have confirmed the formation of 5–8 nm sized CsPbBr 3 nanocrystals and 6–15 nm sized CsPbI 3 nanocrystals. Wherein, the photoluminescence of lead cesium bromide perovskite is tuned in the 490–530 nm range, and the luminescence of iodide perovskite is changed in the 640–740 nm range. The maximum luminescence quantum yield of pure CsPbI 3 perovskites is 19%. Water, climate and acid resistance tests show borogermanate glasses with perovskite nanocrystals are compatible with commercial dense crowns. .