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首页> 外文会议>Conference on Optical Components and Materials; 20040126-20040127; San Jose,CA; US >Local precipitation of upconversion nanocrystals in rare-earth doped oxyfluoride glasses by laser irradiation
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Local precipitation of upconversion nanocrystals in rare-earth doped oxyfluoride glasses by laser irradiation

机译：激光辐照稀土掺杂氟氧化玻璃中上转换纳米晶体的局部沉淀

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摘要

Rare earth-doped oxyfluoride glass of the 50SiO_2 ·50PbF_2 ·5ErF_3 composition in molar ratio was developed. When the oxyfluoride glass is heat-treated at the first crystallization 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 transparent 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 CO_2 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.
机译：研制了摩尔比为50SiO_2·50PbF_2·5ErF_3的稀土掺杂氟氧化物玻璃。当在第一结晶温度下对氟氧化物玻璃进行热处理时，该玻璃产生玻璃陶瓷，其中直径约20nm的含稀土的萤石型纳米晶体均匀地沉淀在玻璃基质中。该玻璃陶瓷像没有经过热处理的氟氧化物玻璃一样，对肉眼是透明的。该玻璃陶瓷在800和/或980nm激光激发下表现出高效的上转换发光。另一方面，通过各种激光的光吸收产生的热能，氟氧化物玻璃可以以点，线，面，字母等形式局部改变为玻璃陶瓷。在CO_2激光照射的情况下，这种玻璃-陶瓷的形成发生在玻璃表面附近。另一方面，在用钛蓝宝石激光器或激光二极管照射800或980nm的情况下，这种玻璃陶瓷的形成发生在玻璃的表面和/或内部附近。通过在激光激发下的上转换发光，可以轻松读取玻璃陶瓷零件。因此，当前开发的掺杂稀土的氟氧化物玻璃可以用作写和读存储器的光学装置，其可以用作用于安全信息的特定装置。

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