Samarium doped calcium sulfate ultra-phosphate glasses: Structural, physical and luminescence investigations

Abstract Luminescence mechanism of RE doped glasses is significant in optical devices, the glasses of compositions (80- x ) P 2 O 5 -20CaSO 4 -( x ) Sm 2 O 3 with 0.3 ≤ x ≤ 1.5 mol% have been prepared by melt-quench method. The result of XRD patterns affirmed the amorphous nature of the samples. The structure was investigated successfully using FTIR, NMR and Raman in order to examine the molecular vibrational modes and to verify the de-polymerization process. Absorption and photoluminescence spectra of Sm 2 O 3 doped calcium ultra-phosphate glasses have been reported. Three emission band of Sm 3+ centered at 4 G 5/2 → 6 H 9/2 (642 nm), 4 G 5/2 → 6 H 7/2 (597 nm) and 4 G 5/2 → 6 H 5/2 (559 nm) have been observed at λ exc  = 402 nm. The spectroscopic research reveals the de-polymerization pattern in P 2 O 5 glass structure by conversion of Q 3 →Q 2 →Q 1 and to Q o units. Physical and optical properties were investigated, doped ions were successfully position at interstice spaces in CSP, the physical properties such as, density, Polarizability, Molar refractivity, and refractive index etc, have been estimated. The absorption spectra in the wavelength range 900–1700 nm were determined, the spectra consist of seven absorption peaks corresponds to transitions from 6 H 5/2 ground state to excited state. From the absorption edge spectra, the band gap (direct and indirect) and the Urbach energy (ΔE) values were evaluated. The conventional JO (Judd-Ofelt) intensity parameters (Ω 2 , Ω 4 and Ω 6 ) and root mean square (δ rms ) deviation have been evaluated and discussed with respect to Sm 3+ concentration. Obtained result goes along with the Sm 3+ doped magnesium zinc sulfo-phosphate glasses for advancement of many functional glasses.