Optical properties of CsPbCl₃ nanocrystals in phosphate glass

CsPbCl₃ nanocrystals embedded glasses have potential to incorporate transition metal ions and lead to efficient spectral conversion for applications as solar concentrator materials in building. Here, CsPbCl₃ nanocrystals were precipitated through heat-treatment in phosphate glasses with potential application in building. X-ray diffraction patterns confirm that CsPbCl₃ nanocrystals were formed in glasses. By changing the heat-treatment conditions, absorption peaks of the CsPbCl₃ nanocrystals can be tuned from 3.06 eV (405 nm) to 3.25 eV (381 nm). Upon 255–325 nm UV light excitation, photoluminescence in the range of 350–530 nm was observed. Upon 325–375 nm UV light excitation, CsPbCl₃ nanocrystals exhibited narrow band photoluminescence centering at 405–410 nm with Stokes shift almost linearly dependent on the band gap energy of CsPbCl₃ nanocrystals.