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- Title
Study on Upconversion and Thermal Properties of Tm3+/Yb3+ Co-Doped La2O3-Nb2O5-Ta2O5 Glasses.
- Authors
Zhang, Minghui; Wen, Haiqin; Pan, Xiuhong; Yu, Jianding; Shao, Hui; Ai, Fei; Yu, Huimei; Tang, Meibo; Gai, Lijun
- Abstract
The effect of Yb3+ ions on upconversion luminescence and thermal properties of Tm3+/Yb3+ co-doped La2O3-Nb2O5-Ta2O5 glasses has been studied. Glass transition temperature is around 740 °C, indicating high thermal stability. The effect of Yb3+ ions on the thermal stability is not obvious. Both the glass forming ability and the upconversion luminescence first increase and then decrease with the increase of Yb3+ ions. The glasses perform low glass forming ability with ΔT around 55 °C. Blue and red emissions centered around 477, 651, and 706 nm are obtained at the excitation of 976 nm laser. The upconversion luminescence mechanism is energy transfer from Yb3+ to Tm3+ mixed with two- and three- photon processes. The thermal kinetic Differential Thermal Analysis (DTA)-analysis indicates that the average activation energy first increases and then decreases with the increase of Yb3+ ions. This result can be introduced in order to improve upconversion luminescence of glasses by crystallization in the future. Tm3+/Yb3+ co-doped La2O3-Nb2O5-Ta2O5 glasses with good upconversion and thermal properties show promising applications in solid-state laser, optical temperature sensing.
- Subjects
PHOTON upconversion; THERMAL properties of metals; GLASS transition temperature; DIFFERENTIAL thermal analysis; ACTIVATION energy; ENERGY transfer
- Publication
Materials (1996-1944), 2018, Vol 11, Issue 8, p1352
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma11081352