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RESEARCH PRODUCT

Excitation and emission spectra of LaInO3-based solid solutions doped with Sm3+, Sb3+

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Abstract X-ray analysis showed that all the ceramic samples of La 1- x Sm x InO 3 (0.010≤ x ≤0.025) solid solutions were single-phased but the samples of nominal composition of LaIn 0.98 Sb 0.02 O 3 , La 0.98 Sm 0.02 In 0.98 Sb 0.02 O 3 contained a small amount of impurity phase of LaSbO 3 -based solid solutions. It was established that La 0.98 Sm 0.02 InO 3 solid solution under the excitation of 275 nm and 320 nm exhibits the strongest photoluminescence among La 1- x Sm x InO 3 solid solutions with 0.010≤ x ≤0.025. Photoluminescence bands located in wavelength ranges of 550–580 nm, 585–625 nm and 630–680 nm exhibit 2–3 clear maxima each. According to the locations of these maxima we calculated the magnitudes of Stark splitting of 6 H 5/2 , 6 H 7/2 , 6 H 9/2 multiplets of the main 6 H term of Sm 3+ ion by crystal field of La 1- x Sm x InO 3 solid solutions with orthorhombically distorted perovskite structure. It was established that the intensity of PL spectra obtained at λ ex =320, 405 and 470 nm is significantly higher for sample of La 0.98 Sm 0.02 In 0.98 Sb 0.02 O 3 nominal composition than that of La 0.98 Sm 0.02 InO 3 solid solution. It could be explained by sensitizing effect of Sb 3+ ions on Sm 3+ ions photoluminescence or by higher PL intensity of Sm 3+ ions of impurity phase than of LaInO 3 matrix.