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Transparent red-emitting ceramics have attracted considerable attention for advanced optical technologies, yet their practical applications remain limited. In the search for new optical materials, there is increasing interest in achieving transparency in non-cubic systems; here, we explored the fabrication of red-emitting ceramics using fluorapatite, a non-cubic host. Eu³⁺-doped calcium and strontium fluorapatite (Eu³⁺:FAP and Eu³⁺:S-FAP, respectively) ceramics were synthesized via a wet-chemical route and spark plasma sintering. The ceramics sintered at 950 °C exhibited the highest transparency, achieving in-line transmittances of 81.2% and 72.9% at the red wavelength of 619 nm, and grain sizes of 98 and 153 nm, respectively. High-resolution transmission electron microscopy confirmed that the grain boundaries and triple junctions were free of melts and other inclusions that could cause light scattering. Optical characterization revealed strong excitation around 460 nm and sharp red emissions corresponding to the ⁵D₀ → ⁷F₁ (∼580 nm) and ⁵D₀ → ⁷F₂ (∼620 nm) transitions of Eu³⁺. The fluorescence lifetimes of Eu³⁺:FAP and Eu³⁺:S-FAP were 0.5 and 0.87 ms, respectively. These results demonstrate the potential of transparent red-emitting Eu³⁺-doped fluorapatite ceramics for solid-state lighting and biophotonics.

権利情報:

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  This is the peer reviewed version of the following article: Koizumi S, Yousuf A, Mochizuki Y, Ohno T, Morita K, Suzuki TS. et al., Red-emitting transparent Eu3⁺-doped fluorapatite ceramics. J Am Ceram Soc. 2026; 109:e70275, which has been published in final form at https://doi.org/10.1111/jace.70275. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

キーワード: Transparent ceramics, apatite, phosphors, spark plasma sintering, optical materials/properties

刊行年月日: 2025-10-05

出版者: Wiley

掲載誌:

• Journal of the American Ceramic Society (ISSN: 00027820) vol. 109 issue. 1 e70275

研究助成金:

• JST 科学技術振興機構(JST)　 JPMJFR203S (革新的異方性透明多結晶セラミック材料の創出)
• 日本学術振興会（JSPS） 21H01611 (異方性多結晶レーザーセラミックスの創製：ナノ組織化と配向制御)
• 日本学術振興会（JSPS） 23K21035 (異方性多結晶レーザーセラミックスの創製：ナノ組織化と配向制御)

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6041

公開URL: https://doi.org/10.1111/jace.70275

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更新時刻: 2025-12-19 11:02:37 +0900

MDRでの公開時刻: 2026-10-05 08:28:15 +0900