Dy3+-doped tellurite based tungsten-zirconium glasses: Spectroscopic study

作者：Venkataiah G; Jayasankar C K^*

来源：Journal of Molecular Structure, 2015, 1084: 182-189.

DOI：10.1016/j.molstruc.2014.11.062

• Dysprosium
• Tellurite glasses
• Judd-Ofelt analysis
• Luminescence properties

Tellurite based tungsten zirconium glasses-doped with trivalent dysprosium (Dy3+) ions (TWZDy) have been prepared by conventional melt-quenching technique and characterized through thermal, structural and spectroscopic measurements. XRD pattern of the glass confirms its amorphous nature. The functional groups of the TeO3 and TeO4 units along with W-O- and Zr-O vibrations have been identified from Fourier transform infrared spectrum. The energy level analysis has been carried out by using the parametric free-ion Hamiltonian model. Judd-Ofelt theory has been used to explore the spectral intensities of Dy3+ ions in the present glass system. From the emission spectra, the emission intensities increases from 0.05 to 1.0 mol% of Dy3+ ion and then decreases for higher concentrations due to energy transfer between Dy3+ ions. The higher value of peak stimulated emission cross-section (40.46 x 10(-22) cm(2)), noticed for F-4(9/2) -> H-6(13/2) transition, is comparable with other reported Dy3+ systems. The TWZDy glasses emit intense yellowish-white color (x = 0.32; y = 0.44) which is nearer to standard white light zone. The decay curves exhibit single exponential nature at lower concentrations (<= 0.1 mol%) and turns into non-exponential (>= 0.5 mol%) due to energy transfer processes. In order to unravel the energy transfer process the non-exponential decay curves have been fitted to Inokuti-Hirayama (IH) model with S=6. The analyses of the results indicate that the present TWZDy glasses are suitable for luminescent display device applications as well as for white light generation.

• 出版日期2015-3-15