| Autor: |
Álvarez-Ramos, Mario Enrique, Carrillo-Torres, Roberto Carlos |
| Zdroj: |
Indian Journal of Physics; Nov2023, Vol. 97 Issue 13, p4031-4037, 7p |
| Abstrakt: |
Tb3+-doped sodium silica germanate glasses were fabricated by conventional melt quenching technique with dopant concentrations of 0.3%mol and 0.9%mol. Their structural characteristics were analyzed through X-ray diffraction and Raman spectroscopy. The study of their optical properties was carried out through steady-state and time-resolved fluorescence spectroscopies. The emission spectra of both glasses are dominated by 5D4 → 7FJ manifold transitions. The most intense band, associated with the 5D4 → 7F5 transition, shows a clear split into two peaks (541 nm 550 nm) due to crystal field splitting. The decay of Tb3+ emission at 458 nm exhibits a non-exponential evolution accompanied by a shortening of its lifetime as the concentration of Tb3+ increases, due to a non-radiative Tb3+-Tb3+ energy transfer through the cross-relaxation mechanism [5D3, 7F6] → [5D4, 7F0] between two terbium ions. The color coordinates at different excitation wavelengths lie in the yellow-green region of the Commission International de l'Eclairage chromaticity diagram. The results indicate that the studied glasses can be used in applications such as solid-state lighting and display devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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