Dy3+ ions doped oxy-fluoro boro tellurite glasses for the prospective optoelectronic device applications

Abstract

Dysprosium (Dy3+) ions doped oxy-fluoro boro tellurite glasses were prepared by using melt quenching technique to study their structural and optical properties using XRD, Raman, absorption, photoluminescence (PL) and PL decay spectral measurements. The XRD and Raman spectral patterns were used to confirm the glassy nature and various functional groups present in the prepared glasses respectively. The oscillator strengths measured from the absorption spectral features were used to evaluate the Judd-Ofelt (J-O) intensity parameters. The PL spectra recorded under 386 nm excitation wavelength show two intense peaks; one in blue (485 nm) and the other one in yellow (576 nm) region corresponding to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions respectively. By correlating the J-O parameters with PL spectral data, various radiative properties like radiative transition probability (AR), stimulated emission cross section (σse) and branching ratios (βR) were evaluated for 4F9/2 → 6H13/2 and 6H15/2 transitions. Using the PL decay spectral data the experimental lifetimes have been measured and in turn used to measure the quantum efficiency of the prepared glasses. The yellow to blue intensity ratio (Y/B) has been evaluated to understand the white light emission capacity of the host glass by changing the concentration of Dy3+ ions. In order to understand white light emission capacity of the prepared glasses, the CIE color co-ordinates have also been evaluated. From all the aforementioned studies, it is concluded that 1.0 mol% of Dy3+ ions doped oxy-fluoro boro tellurite glass is aptly suitable for optoelectronic device applications.