Abstract
Lanthanum orthophosphate (LaPO4) is a useful host for doping rare earth ions with high quantum efficiencies. In the present investigation the monoclinic LaPO4 and LaPO4:Sm3+ were synthesized via hydrothermal route. SEM, XRD, FTIR and Raman spectroscopy as well as the luminescence spectroscopy were utilized to character the samples of the Sm3+-doped LaPO4. The results indicated that the lattice parameters decreased linearly with Sm3+ concentration, and general linear hypsochromic shifts regarding Sm3+ concentration were observed in infrared spectroscopic wavenumbers and Raman band positions. The emission spectra showed that Sm3+ ions were in more non-centrosymmetric environment when Sm3+ concentration increased.
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