Research Article

Nature of Radiative Recombination Processes in Layered Heterogeneous PbCdI2 Thick Films: Promising Scintillator Materials

Figure 4

Temperature dependence of PL spectrum of PbCdI2 thick films (a). Fitting the separate bands that form PL spectrum of PbCdI2 thick films at ā€‰K. PL bands that correspond to the radiative recombination of bound and free excitons (E), recombination of donor-acceptor pairs involving shallow acceptor centers (D1 + D2), recombination of self-trapped excitons (STE), and recombination of free electrons and the deep acceptor centers (G1 and G3) are observed (b). Curves 1ā€“5 correspond to E, D1 + D2, STE, G1, and G3 bands, respectively. The red dashed curve represents the results of the fitting of the experimental data by the sum of Gaussian functions.
(a)
(b)