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>Effect of alkali metal oxides on upconversion fluorescence properties of germanate-tellurite glasses
Effect of alkali metal oxides on upconversion fluorescence properties of germanate-tellurite glasses
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摘要
Upconversion emissions of Yb3+/Er3+-codoped germanate-tellurite glasses have been investigated upon the excitation of 980 nm laser diode (LD). It is found that up- conversion luminescence intensities significantly increase with the increasing size of alkali metal ions. Raman spectra show that the maximum phonon energies (MPE) of glass hosts are unchanged with the replacement of alkali metal oxides, indicating that MPE is not the reason for the increase of upconversion fluorescence intensities. The analysis of the non-radiative transition of Er3+ demonstrates that the de- crease of the maximum energy phonon density is the main reason for the enhanced fluorescence intensities.
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机译：High-resolution structural studies of ultra-thin magnetic, transition metal overlayers and two-dimensional transition metal oxides using synchrotron radiation
