Yttrium Oxide-Deficient Melts Control Secondary-Phase Distribution in Cerium-Doped Terbium-Yttrium Aluminum Garnet Crystals for White-Light Conversion and X‑ray Imaging.

Authors

Karol Bartosiewicz, Justyna Zeler, Marcin E Witkowski, Masao Yoshino, Robert Tomala, Om Prakash, Damian Szymanski, Maksym Buryi, Aleksandra Owczarek, Andrey Prokhorov, Vítězslav Jarý, Kei Kamada, Pietro Galinetto, Winicjusz Drozdowski, Eugeniusz Zych, Akira Yoshikawa, Gongxun Bai

Published in

Chemistry of materials : a publication of the American Chemical Society. Volume 38. Issue 17. Pages 8987-9003. Sep 08, 2026. Epub Aug 26, 2026.

Abstract

Controlled melt nonstoichiometry was investigated as a processing parameter governing secondary-phase formation and functional properties of Ce³⁺-doped (Tb,Y)₃Al₅O₁₂ single crystals grown by micropulling-down. Crystals were grown from melts with 0, 3, 6, 9, and 11 mol % Y₂O₃ deficiency. X-ray diffraction, electron probe microanalysis, and Raman spectroscopy revealed phase-pure garnet up to 3 mol % deficiency, rim-localized α-Al₂O₃ inclusions at 6 and 9 mol %, and core-localized perovskite-type inclusions at 11 mol %. Secondary-phase formation modified Tb/Y partitioning in the garnet matrix, affecting Ce³⁺ emission kinetics, Tb³⁺↔Ce³⁺ energy transfer, trap depth, and scintillation properties. The 11 mol % deficient crystal showed the highest thermal stability, with the Ce³⁺ thermal-quenching onset shifting from 375 to 425 K. The 9 mol % deficient crystal reached a luminous efficacy of 158 lm/W and a scintillation light yield of 33,600 photons/MeV. X-ray radiography using the 9 mol % Y₂O₃-deficient crystal showed clear images of an SD card. These results indicate that melt nonstoichiometry can tune the balance between photoconversion and scintillation performance in rare-earth garnets.

PMID:
42724735
Bibliographic data and abstract were imported from PubMed on 11 Sep 2026.

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