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Sol–Gel Synthesis of Silica‐Based Oxyfluoride Glass‐Ceramic Thin Films: Incorporation of Eu 3+ Activators into Crystallites
Author(s) -
Fujihara Shinobu,
Kato Takayoshi,
Kimura Toshio
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01080.x
Subject(s) - sol gel , materials science , crystallite , ceramic , luminescence , glass ceramic , thin film , alkoxide , chemical engineering , borosilicate glass , silicon , analytical chemistry (journal) , mineralogy , composite material , nanotechnology , metallurgy , chemistry , optoelectronics , catalysis , organic chemistry , engineering
Transparent oxyfluoride glass‐ceramic thin films were prepared using a sol–gel method starting from rare‐earth trifluoroacetate/silicon alkoxide solutions. SiO 2 –LaF 3 and SiO 2 –LaOF glass‐ceramics were formed by heating at temperatures of 300°–500°C and 600°–900°C, respectively. Eu 3+ activators were successfully incorporated into oxyfluoride crystals, as evidenced by their luminescent properties, such as capability of a charge‐transfer (O 2– –Eu 3+ ) excitation, suppression of a multiphonon relaxation, and occurrence of a cross‐relaxation at low Eu 3+ 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.