Synthesis, Structural and Luminescence Properties of Mn4+-Activated Medium-Entropy Perovskites (La1/3Gd1/3Y1/3)1−xMxAlO3−δ (M = Ca, Sr)
- 1Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
- 2Lviv Polytechnic National University, S. Bandera Street 12, 79013 Lviv, Ukraine
Abstract
Medium-entropy aluminate perovskites of nominal composition (La1/3Gd1/3Y1/3)1−xMxAlO3−δ:0.1%Mn4+ (x = 0, 0.05, 0.1; M = Ca, Sr), were prepared by sol-gel and solid-state routes to examine the effects of synthesis, annealing temperature and A-site substitution on their luminescence. In the case of alkaline-earth-free (La1/3Gd1/3Y1/3)AlO3 system, single-phase materials are formed after heat treatment of sol-gel derived products at the temperature of 1000–1100 °C. Calcium-substituted samples prepared via the sol-gel method are single-phase over a wide annealing temperature range of 1000–1500 °C, whereas strontium-containing samples contain a minor amount of the secondary-phase RESrAl3O7. Solid-state products are multiphase materials, containing perovskite and garnet phase, with extra RECaAl3O7 phase in Ca-substituted samples. The unchanged emission position and spectral profile indicate that Mn4+ ions occupy the same octahedral coordination environment of the perovskite structure in all samples. Moreover, no additional spectral features associated with a garnet phase were detected. However, phase composition, microstructure, and defect chemistry affected PL intensity and trapping. For sol-gel samples, PL was strongest at 1450 °C, whereas TSL was strongest at 1100 °C. Ca2+ and Sr2+ substitution reduced both signals and modified the glow-band shape, with Ca causing the larger decrease, consistent with dopant partitioning and charge compensation. Broad TSL may reflect distributed trap environments from mixed La/Gd/Y occupation. Solid-state samples showed stronger PL, higher TSL, and measurable UV-excited afterglow.
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BibTeX
@article{padole2026synthesis,
title = {{Synthesis, Structural and Luminescence Properties of Mn4+-Activated Medium-Entropy Perovskites (La1/3Gd1/3Y1/3)1−xMxAlO3−δ (M = Ca, Sr)}},
author = {Akash S. Padole and Vasyl Hreb and Vitalii Stadnik and Yurii Hirskyi and Halyna Zhydachevska and Leonid Vasylechko and Yaroslav Zhydachevskyy},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31203744},
url = {https://www.mdpi.com/1420-3049/31/20/3744},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Synthesis, Structural and Luminescence Properties of Mn4+-Activated Medium-Entropy Perovskites (La1/3Gd1/3Y1/3)1−xMxAlO3−δ (M = Ca, Sr)
AU - Akash S. Padole
AU - Vasyl Hreb
AU - Vitalii Stadnik
AU - Yurii Hirskyi
AU - Halyna Zhydachevska
AU - Leonid Vasylechko
AU - Yaroslav Zhydachevskyy
PY - 2026
DA - 2026/10/01
JO - Molecules
DO - 10.3390/molecules31203744
UR - https://www.mdpi.com/1420-3049/31/20/3744
AB - Medium-entropy aluminate perovskites of nominal composition (La1/3Gd1/3Y1/3)1−xMxAlO3−δ:0.1%Mn4+ (x = 0, 0.05, 0.1; M = Ca, Sr), were prepared by sol-gel and solid-state routes to examine the effects of synthesis, annealing temperature and A-site substitution on their luminescence. In the case of alkaline-earth-free (La1/3Gd1/3Y1/3)AlO3 system, single-phase materials are formed after heat treatment of sol-gel derived products at the temperature of 1000–1100 °C. Calcium-substituted samples prepared via the sol-gel method are single-phase over a wide annealing temperature range of 1000–1500 °C, whereas strontium-containing samples contain a minor amount of the secondary-phase RESrAl3O7. Solid-state products are multiphase materials, containing perovskite and garnet phase, with extra RECaAl3O7 phase in Ca-substituted samples. The unchanged emission position and spectral profile indicate that Mn4+ ions occupy the same octahedral coordination environment of the perovskite structure in all samples. Moreover, no additional spectral features associated with a garnet phase were detected. However, phase composition, microstructure, and defect chemistry affected PL intensity and trapping. For sol-gel samples, PL was strongest at 1450 °C, whereas TSL was strongest at 1100 °C. Ca2+ and Sr2+ substitution reduced both signals and modified the glow-band shape, with Ca causing the larger decrease, consistent with dopant partitioning and charge compensation. Broad TSL may reflect distributed trap environments from mixed La/Gd/Y occupation. Solid-state samples showed stronger PL, higher TSL, and measurable UV-excited afterglow.
SN - 1420-3049
ER -