Palestrante
Descrição
In recent years, rare-earth ions doped glasses have been widely studied for their luminescence properties, such as the near-infrared to visible light emission via up-conversion, which occurs when two or more low-energy photons generate the emission of photon energies higher than the initial light due to its non-linear dependence on incident light intensity. (1) Particularly, glass oxides (e.g., TeO$_2$ , SiO$_2$ and B$_2$O$_3$) are optically transparent for UV to NIR spectral range and their capability to incorporate high concentrations of rare-earth ions (2) and obtain coloured light emission, however, high efficiency has not been achieved. In this research, tellurite glasses doped with Er$^{3+}$, Tm$^{3+}$ and Yb$^{3+}$ were fabricated by conventional melt-quenching method and characterized by absorption spectroscopy, refractive index and up-conversion luminescence. Tuneable up-conversion emission was obtained by adjusting the laser excitation power at 976 nm and white light emission based on the colour mixing of red, green and blue light was observed. The balancing of the relative intensity of each colour is provided by the energy transfer process between the rare-earth ions.
Referências
1 POLLNAU, M. et al. Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems. Physical Review B, v. 61, n. 5, p. 3337-3346, Feb. 2000.
2 PISARSKI, W. A. et al. Erbium-doped lead silicate glass for near-infrared emission and temperature-dependent up-conversion applications. Opto-Electronics Review, v. 25, n. 3, p. 238-241, 2017.
| Apresentação do trabalho acadêmico para o público geral | Não |
|---|---|
| Subárea | Óptica e Lasers |
