Sol-Gel Synthesis of Silica-Based Oxyfluoride Glass-Ceramic Thin Films: Incorporation of Eu3+ Activators into Crystallites

Shinobu Fujihara, Takayoshi Kato, Toshio Kimura

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Abstract

Transparent oxyfluoride glass-ceramic thin films were prepared using a sol-gel method starting from rare-earth trifluoroacetate/silicon alkoxide solutions. SiO2-LaF3 and SiO2-LaOF glass-ceramics were formed by heating at temperatures of 300°-500°C and 600°-900°C, respectively. Eu3+ activators were successfully incorporated into oxyfluoride crystals, as evidenced by their luminescent properties, such as capability of a charge-transfer (O2--Eu3+) excitation, suppression of a multiphonon relaxation, and occurrence of a cross-relaxation at low Eu3+ concentrations. As a result, the films exhibited strong red emission by ultraviolet excitation. The incorporation supposedly originated from decomposition of the (La,Eu)-trifluoroacetates in the silica-gel matrix.

Original languageEnglish
Pages (from-to)2716-2718
Number of pages3
JournalJournal of the American Ceramic Society
Volume84
Issue number11
Publication statusPublished - 2001 Nov

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ASJC Scopus subject areas

  • Ceramics and Composites

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