Local precipitation of upconversion nanocrystals in rare-earth-doped oxyfluoride glasses by laser irradiation

Hidekazu Hashima; Akio Konishi; Yoshinori Tanigami; Daisuke Shibata; Yoji Kawamoto

doi:10.1117/12.526202

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14 June 2004 Local precipitation of upconversion nanocrystals in rare-earth-doped oxyfluoride glasses by laser irradiation

Hidekazu Hashima, Akio Konishi, Yoshinori Tanigami, Daisuke Shibata, Yoji Kawamoto

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Proceedings Volume 5350, Optical Components and Materials; (2004) https://doi.org/10.1117/12.526202
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

Rare earth-doped oxyfluoride glass of the 50SiO₂ -50PbF₂ -5ErF₃ composition in molar ratio was developed. When the oxyfluoride glass is heat-treated at the first cystallization temperature, the glass gives the glass-ceramic in which rare earth-containing fluorite-type nanocrystals of about 20 nm in diameter uniformly precipitate in the glass matrices. The glass-ceramic is trasnparent to the naked eye like no heat-treated oxyfluoride glass. The glass-ceramic exhibits highly efficient upconversion luminescence under 800 and/or 980 nm laser light excitation. On the other hand, the oxyfluoride glass can be locally changed to glass-ceramic in the forms of dot, line, plane, letter, etc. by thermal energies generated from light absorption of various lasers. In the case of CO₂ laser irradiation the formation of such glass-ceramic occurs near the surface of glass. In the case of 800 or 980 nm irradiation by Ti:sapphire laser or laser diodes, on the other hand, the formation of such glass-ceramic occurs near the surface and/or inside of glass. The glass-ceramic parts can be easily read by upconversion luminescence under laser excitation. Therefore, the presently developed rare earth-doped oxyfluoride glass can be utilized as optical devices of the writing and reading memory, which can be utilized as specific devices for security information.

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Hidekazu Hashima, Akio Konishi, Yoshinori Tanigami, Daisuke Shibata, and Yoji Kawamoto "Local precipitation of upconversion nanocrystals in rare-earth-doped oxyfluoride glasses by laser irradiation", Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); https://doi.org/10.1117/12.526202

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