| 희토류 원소 첨가 비정질 찰코지나이드 : 형광 수명과 유리 구조 변화의 관계 |
| 최용규 |
| 한국항공대학교 항공재료공학과 |
| Amorphous Chalcogenide Solids Doped with Rare-Earth Element : Fluorescence Lifetimes and the Glass Structural Changes |
| Choi Yong Gyu |
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| ABSTRACT |
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Lifetime of excited electronic states inside the 4f configuration of rare-earth elements embedded in chalcogenide glasses is very sensitive to medium-range structural changes of the host glasses. We have measured lifetimes of the 1.6$mutextrm{m}$ emission originating from Pr$^$3+/ : ($^3$F$_3$, $^3$F$_4$)longrightarrow$^3$H$_4$ transition in amorphous chalcogenide samples consisting of Ge, Sb, and Se elements. The measured lifetimes fumed out to have their maximum at the mean coordination number of -2.67, which arises accordingly from structural changes of the host glasses from 2 dimensional layers to 3 dimensional networks. This new finding supports that the so-called topological structure model together with chemically ordered network model is adequate to explain relationship between the emission properties of rare-earth elements and the medium-range structures of amorphous chalcogenide hosts with a large covalent bond nature. Thus, it is validated to predict site distribution and lifetime of rare-earth elements doped in chalcogenide glasses simply based on their mean coordination number. |
| Key words:
Rare-earth elements, Chalcogenide glasses, Class structure, Lasers and amplifiers |
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