@article{Kosyanov2026, 
author = {Denis Yu. Kosyanov and Anastasia A. Vornovskikh and Alexey P. Zavjalov and Zlata E. Priimak and Andrei A. Leonov and Andrei A. Obraztsov and Yanbin Wang and Ziqiu Chen and Zhenzhen Zhou and Jiang Li},
title = {Ce:GAGG and Al2O3−Ce:GAGG phosphor ceramics for laser-driven lighting: Effects of Ga3+ substitution},
year = {2026},
journal = {Journal of Advanced Ceramics},
volume = {15},
number = {4},
pages = {9221267},
keywords = {Ce:Gd3Al5−xGaxO12 (Ce:GAGG), ceramic phosphors, oxygen sintering, phase formation, microstructure, luminescence performance, laser-driven lighting.},
url = {https://www.sciopen.com/article/10.26599/JAC.2026.9221267},
doi = {10.26599/JAC.2026.9221267},
abstract = {Monophase Ce:Gd3Al5−xGaxO12 (Ce:GAGG) with x = 0.5–3.0 and 50 vol% Al2O3−containing composite phosphor ceramics (PCs) were prepared in a pure oxygen atmosphere. The effects of Ga3+ substitution on their phase formation, microstructure, and luminescence properties were systematically investigated. For Ce:GAGG series samples, no additional phases were identified, and the distribution of Ga between the octahedral (Al/Ga)2 (0, 0, 0) and tetrahedral (Al/Ga)3 (0.375, 0, 0.25) sites of the garnet phase was clarified. For Al2O3−Ce:GAGG composites, the exchange of Al and Ga elements between the phases of garnet Ga(Al,Ga)G and oxide (Al,Ga)2O3 was revealed, and the transformation of (Al,Ga)2O3 from the α- to κ-phase (x ≥ 2.0) with the formation of elongated grains and their partial melting (x = 3) is shown. This was also reflected in a less pronounced shift of the photoluminescence peak (PL) toward shorter wavelengths for the composite series in comparison with the monophase series: with an increase in x to 3.0, the shift in the position of the PL peak of intensity by 18 nm for Al2O3−Ce:GAGG was equivalent to that for Ce:GAGG at x = 1.5. A phosphorescence phenomenon was found at x = 2.5 and 3.0 for monophasic Ce:GAGG compositions. Under the excitation of 1 W 450 nm LDs in reflection mode, 0.4 mm-thick Al2O3−Ce:GAGG with x = 0.5–1.5 had an optimum correlated color temperature of 5400–6300 K, a luminous efficiency of 123–145 lm∙W−1, and a color rendering index (Ra = 69–64). The obtained PCs showed high application potential in solid-state laser lighting.}
}