Abstract
Novel blue emitting thulium doped La2(MoO4)3 nanophosphors were synthesized by facile co-precipitation method and the spectroscopic features were systematically studied on the basis of Judd-Ofelt analysis. The tetragonal phase formation of Tm3+ doped La2(MoO4)3 with space group I41/a is confirmed from the XRD analysis and the growth mechanism by oriented attachment is revealed by TEM analysis. The 1D2→3F4 transition at 453 nm is the dominant emission peak of Tm3+ in the photoluminescence emission spectra and offers major contribution towards the intense blue emission of the phosphor material. The Judd-Ofelt intensity parameters exhibit the trend Ω2>Ω4>Ω6, which point out the asymmetric site occupancy of Tm3+ ions in the host matrix. The estimated higher branching ratio for 1D2→3F4 blue emission of Tm3+ signifies it as a potential laser emission transition. The CIE chromaticity co-ordinates of optimized La1.94Tm0.06(MoO4)3 nanophosphors falls in the blue region of the chromaticity diagram with co-ordinates (0.214,0.097).
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