Highly efficient upconversion emission and luminescence switching from Yb3+/Tm3+ co-doped water-free low silica calcium aluminosilicate glass |
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| Authors: | WF Silva FG Rego-Filho MT de Araujo EA Gouveia MVD Vermelho PT Udo NGC Astrath ML Baesso C Jacinto |
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| Institution: | 1. Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, AL, Brazil;2. Departamento de Física, Universidade Estadual de Maringá, 87020-900 Maringá, PR, Brazil;1. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain;2. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, 28049 Madrid, Spain;3. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain |
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| Abstract: | We present highly efficient 480 and 800 nm upconversion emissions in Tm3+/Yb3+ co-doped water-free low silica calcium aluminosilicate glass under excitation at 976 nm. As a result of this efficient upconversion process, a luminescent switching with the excitation intensity has been observed. The switching is explained and discussed using rate equations analysis and saturation effects. By means of fitting of the experimental data point, it was possible to obtain the value of the energy transfer parameter related to the transition 2F5/2, 3H4→2F7/2, 1G4. The value of this parameter is higher than that of materials like YLF. This switching mechanism could be used in the development of sensors and networks for optical processing and optical communications. |
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