Abstract
Samarium doped zinc phosphate glasses of the form 40ZnO-(60-x) P2O5-xSm2O3, with 1.0 ≤ x ≤ 5.0 mol% were prepared using the melt quenching method. The XRD patterns confirmed the amorphous nature of the glass. The Archimedes method was used to measure the density, which was used to calculate the molar volumes. The density was found to vary in the range of 2.839 to 3.138 gm/cm3 while the molar volume varied between 40.80 and 42.21cm3/mol. The effect of samarium on the optical absorption and emission characteristics were examined. The absorption spectra exhibit two dominant absorption peaks corresponding to the transitions from 6H5/2 ground state to 4I11/2 and 4F7/2 excited states, respectively. Photoluminescence emission consisting of 4G5/2 à 6H5/2, 6H7/2, 6H9/2 and 6H11/2 transitions display significant enhancement with the increase of Sm3+ concentration up to 3.0 mol% followed by a rapid quenching beyond this concentration which is ascribed to the nonradiative energy transfer and multi-phonon relaxation processes.
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