Excitation and photoluminescence spectra of single- and non-single-phased phosphors based on LaInO3 doped with Dy3+, Ho3+ activators and Sb3+ probable sensitizer

Single-phased La0.95Ln0.05InO3 (Ln - Dy, Ho), La0.90Dy0.05Ho0.05InO3, LaInO3 ceramic samples as well as the La0.95Ln0.05In0.98Sb0.02O3 (Ln - Dy, Ho), La0.90Dy0.05Ho0.05In0.98Sb0.02O3, LaIn0.98Sb0.02O3 samples with additional impurity LaSbO3 phase were prepared by solid-state reactions method. Their excitation and photoluminescence (PL) spectra were measured at room temperature. It was established that PL bands intensity of spectra obtained for samples of nominal composition La0.95Dy0.05In0.98Sb0.02O3, La0.95Ho0.05In0.98Sb0.02O3, La0.90Dy0.05Ho0.05In0.98Sb0.02O3 is much higher than that of single-phase La0.95Dy0.05InO3, La0.95Ho0.05InO3, La0.90Dy0.05Ho0.05InO3 solid solutions. It may be probably explained by sensitizing effect of Sb3+ ions on Dy3+, Ho3+ ions photoluminescence. Although it can't be excluded that the reason could be higher PL of Dy3+ and Ho3+ ions in impurity matrix than in LaInO3-based matrix. It was observed in the PL spectrum of La0.90Dy0.05Ho0.05In0.98Sb0.02O3 sample that under the excitation by λex = 320 nm an intense simultaneous emission of blue, green and yellow light took place.