Physical and spectroscopic studies of Sm3+ ions doped Alumino Tungsten Borate glasses for photonic applications

Trivalent samarium ion doped glasses with molar composition 10MgO-10WO(3)-10Al(2)O(3)-BaF2-(60-X) B2O3-XSm2O3 (where X = 0.5, 1.0, 1.5, 2.0, 2.5 mol %) are prepared by melt quenching method. These glasses are characterized by various spectroscopic techniques such as optical absorption, excitation, emission and decay spectral studies. The amorphous nature is confirmed by XRD studies. From the absorption spectra, oscillator strengths and the Judd-Ofelt (J-O) intensity parameters (Omega(2), Omega(4), Omega(6)) are calculated. The measured emission spectra exhibit four transitions (4)G(5/2) -> H-6(5/2), H-6(7/2), H-6(9/2) and H-6(11/2) at 565 nm, 602 nm, 650 nm and 709 nm. Various radiative parameters such as branch ratio (beta(R)), transition probability (A(R)), radiative lifetime (tau(R)), effective bandwidth (Delta lambda(p)) and stimulated emission cross-section (sigma(se)) have been calculated. The photoluminescence decay measurements are carried out at (4)G(5/2) fluorescent level of Sm3+ ion doped AlWB glasses under 402 nm excitation wavelength. From decay curve analysis, quantum efficiencies of the as prepared glasses are calculated. The CIE Chromaticity coordinates are evaluated from the emission spectra which establishes the reddish orange emission from the prepared glasses. From the above luminescent properties, it is understood that the prepared glasses are suitable for reddish orange laser applications especially in opto-electronic devices.