Excitation and photoluminescence spectra of solid solutions based on lanthanum indate LaInO₃ of a perovskite structure doped with Nd³⁺ and Cr³⁺ ions

Using a solid-phase method, single-phase solid solutions of La_1–xNd_xInO₃ (x = 0.007, 0.02, 0.05), LaIn0.99Cr0.01O3, and La_0.95Nd_0.05In_0.995Cr_0.005O₃ have been obtained and their excitation and photoluminescence (PL) spectra have been studied at room temperature. It is found that the intensity of excitation and PL bands for La_1–xNd_xInO₃ solid solutions depends on the degree of the substitution of La³⁺ ions by Nd³⁺ ions. A solid solution with 0.02 < x < 0.05 possesses the largest intensity of the PL bands in IR wavelength range of 850–950, 1040–1100, and 1350–1370 nm. It is found that replacing 0.5% of In³⁺ ions in a solid solution of La^0.95Nd^0.05InO₃ by Cr³⁺ ions leads to a substantial increase in the intensity of all the PL bands by exciting with light of the wavelength of λ_exc = 490 nm and a decrease in the intensity of all the PL bands by an excitation with light of the wavelengths of λ_exc = 358, 532, and 585 nm.