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Sensors and Materials, Volume 38, Number 2(1) (2026)
Copyright(C) MYU K.K.

pp. 673-678
S&M4336 Research paper
https://doi.org/10.18494/SAM6091
Published: February 6, 2026

Synthesis of Composite Films in Tb2O3–Al2O3 Eutectic System by CVD method and Their Tb3+-centered Luminescence [PDF]

Natsumi Imai and Akihiko Ito

(Received October 31, 2025; Accepted December 22, 2025)

Keywords: Tb2O3–Al2O3 eutectic system, composite, chemical vapor deposition, luminescence

Composite films in the Tb2O3–Al2O3 eutectic system were synthesized on sapphire substrates by the laser-assisted chemical vapor deposition method. On a c-cut sapphire substrate, TbAlO3 (TAP)–α-Al2O3 and Tb3Al5O12 (TAG)–α-Al2O3 composite films were obtained at 6.4–39.6 mol%Tb2O3 in precursor vapor. At compositions close to the eutectic point of 22.0 mol%Tb2O3, a lamellar structure formed, whereas at compositions far from the eutectic point, a rod-like structure formed. Both TAP–α-Al2O3 and TAG–α-Al2O3 composite films exhibited green luminescence originating from the 5D4–7Fn (n = 3–6) transitions of Tb3+ centers with decay time constants of 0.67 and 1.46 ms for the TAP–α-Al2O3 composite film and 0.75 and 1.31 ms for the TAG–α-Al2O3 composite film.

Corresponding author: Akihiko Ito

This work is licensed under a Creative Commons Attribution 4.0 International License.

Cite this article
Natsumi Imai and Akihiko Ito, Synthesis of Composite Films in Tb2O3–Al2O3 Eutectic System by CVD method and Their Tb3+-centered Luminescence, Sens. Mater., Vol. 38, No. 2, 2026, p. 673-678.