Influence of silver nitrate (AgNO3) on structural and spectroscopic attributes of Dy3+ ions doped Borotelluro-phosphate glasses for WLED applications
摘要
An exclusive set of Dy3+ ions doped AgNO3-incited Borotelluro-phosphate glass samples with the configuration (29.5−x)B2O3+xAgNO3+20TeO2+20BaO+20BaF2+10P2O5+0.5Dy2O3 (x= 0 0.05, 0.075, 0.1, 0.5 and 0.75 in wt.%) were fabricated by the traditional melt-quenching approach. The structural behavior has been confirmed via the XRD profile, which exhibits an amorphous nature. The bending and stretching vibration of the host matrix was affirmed through FTIR spectral studies. The physical attributes of the synthesised samples were estimated, and the BTPBBDy: 0.75Ag glass sample has a higher density (3.811 g/cm3), higher refractive index (1.737) and a higher concentration of rare earth ions (1.698×020 ions/cm3), which reveals a more compact structure within the glass network among the other samples. From the optical absorption spectral analysis, the bonding parameters, oscillator strengths and JO intensity parameters of the fabricated glass samples were estimated and reported. For all the equipped samples, JO parameters exhibit the trend as Ω2>Ω4>Ω6. These results demonstrate that the BTPBBDy:xAg glasses reveal a higher asymmetry around the Dy3+ ions. From the emission spectra, three spectral transitions 4F9/2→6H11/2 (red), 4F9/2→6H13/2 (yellow), 4F9/2→6H15/2 (blue) were observed at the wavelengths of 664, 576 and 484 nm respectively. The radiative properties, lifetime and efficiency were estimated through emission, JO parameters and decay analysis. For all the glasses, decay from the 4F9/2 excited state is obtained to be non-exponential in nature. The color chromaticity coordinates are estimated and plotted in the 2D-color CIE diagram; all the samples exhibit emission in the bluish white region.