Effect of Yb3+ concentration on the optical properties and trap creation in CsPbCl3 perovskite powder

Inorganic halide perovskites are interesting materials that are characterized by a small energy gap and tunable exciton luminescence achieved by exchanging the halide ion in the structure. They are mainly obtained in the form of colloids or thin films, resulting in small grain sizes with narrow distribution. The unique physicochemical properties of perovskites give them great application potential, which is additionally increased by doping with optically active ions. In this paper, the structural and spectroscopic properties of the CsPbCl3:x%Yb3+ (x = 1, 5, 10, 15, 20%) concentration series prepared by the solid state method are investigated. Besides the measurements of X-ray diffraction, Raman spectroscopy, diffuse reflectance, excitation, emission and decay curves, a thermoluminescence analysis was also performed for the first time for CsPbCl3:Yb3+. It was found that the dopant content strongly influences the obtained results. The introduction of more than 10% of Yb3+ ions into the host lattice leads to a deterioration of the optical properties.