Nd3+ doped new oxyfluoro tellurite glasses and glass ceramics containing NaYF4 nano crystals: 1.06 µm emission analysis.
RAJESH, Dagupati; DE CAMARGO, Andrea Simone Stucchi.
RAJESH, Dagupati; DE CAMARGO, Andrea Simone Stucchi.
 Abstract: Oxyfluoro tellurite glasses with chemical composition TeO2-ZnO-YF3-NaF(TZYN), doped with Nd3+ in different concentrations were prepared by the melt-quenching technique. Judd-Ofelt analyses of Nd3+ ions in the precursor glasses were performed to evaluate the phenomenological intensity parameters O2,4,6. From the NIR emission spectra, characteristic parameters such as effective band with (??eff) and stimulated emission cross section (sP) were calculated for the three observed transitions, 4F3/2 ? 4I9/2, 4I11/2 and 4I13/2 and compared to other reported glasses. Based on the luminescence decay times of 4F3/2 excited state, the quantum efficiency was evaluated and it is highest for a 0.2 mol% Nd3+ doped glass (G-Nd2). Glass ceramics were obtained by controlled heat treatment of the glasses at 390 °C for 5h (as determined by DSC), which is greater than the glass transition temperature Tg. Moreover, DSC results revealed that precipitation of the NdYF4 nanocrystalline phase (TC1) decreased with increasing Nd3+ concentration. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) investigations reveal that spherical NaYF4 nano-crystals are distributed homogeneously across the glassy matrix. The emission intensity of the 4F3/2?4I11/2 transition at 1.60 µm was enhanced in glass ceramics as compared to glasses because of the occupancy of the Nd3+ in NaYF4 nanocrystlline phase. The experimental lifetime value of 4F3/2 also enhanced from 124 to 187 µs from G-Nd2 glass to GC-Nd2 glass ceramic and decreased with increasing Nd3+ concentration. | |
| Journal of Luminescence |
| v. 207, p. 469-476 - Ano: 2019 |
| Fator de Impacto: 2,732 |
| http://dx.doi.org/10.1016/j.jlumin.2018.11.058 |  @article={002916834,author = {RAJESH, Dagupati; DE CAMARGO, Andrea Simone Stucchi.},title={Nd3+ doped new oxyfluoro tellurite glasses and glass ceramics containing NaYF4 nano crystals: 1.06 µm emission analysis},journal={Journal of Luminescence},note={v. 207, p. 469-476},year={2019}} |