• K. Vijaya Babu

Sm2O3-doped Sodium lead alumino borosilicate (NPABS) glasses are prepared by the melt quenching technique and are characterized through various spectroscopic techniques such as X-ray diffraction spectra, FT-IR, Optical absorption, excitation, emission and decay to derive various spectroscopic properties. The glassy nature of the present glass matrices are confirmed by XRD analysis. The presence of fundamental vibrational groups such as BO3, BO4, B-O-B, Si-O-Si and SiO4 are explored through the FT-IR spectral measurements. The Optical band gap and Urbach energies have been evaluated from the absorption edges of the absorption spectra of Sm2O3 doped prepared glasses. The Judd-Ofelt (JO) analysis has been applied to evaluate the intensity parameters, Ωλ (λ=2, 4 and 6), experimental and theoretical oscillator strengths are also determined and reported. These JO parameters have been used to evaluate radiative properties such as radiative transition probabilities, branching ratios, radiative life time and stimulated emission cross-sections for the luminescent levels of Sm3+ ion. From the photoluminescence spectra the glasses shows the strongest emission at 601 nm when they are excited by 402 nm. The optimum concentration of Sm2O3 in titled glass is 1.0 mol% which exhibit the highest intensity of emission. The CIE color chromaticity coordinates have also been calculated to characterize the emission of the prepared glasses. The color purity and the correlated color temperature are also calculated and the results were discussed in the present work. The lifetime corresponding to the 4G5/2 level of the title glasses has been found to decrease with the increase in Sm3+ion concentration which may be causes luminescence quenching, energy transfer through cross-relaxation. The results indicate that the present glasses could be useful for photonics applications. Among the prepared glasses, NPABSSm10 glass exhibits higher βR, σ_P^E, σ_P^E x τR, σ_P^E x Δλeff values corresponding to the 4G5/2 → 6H7/2 emission band and these are in turn specifies its suitability for LEDs and visible laser applications.

"Studies on Spectral and Photo luminescence properties of Sm3+ ions in sodium lead alumino borosilicate glasses ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.36-48, November-2018, Available :http://www.jetir.org/papers/JETIR1811096.pdf

"Studies on Spectral and Photo luminescence properties of Sm3+ ions in sodium lead alumino borosilicate glasses ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp36-48, November-2018, Available at : http://www.jetir.org/papers/JETIR1811096.pdf