Emission analysis of Pr3+ & Dy3+ ions doped Li2O-LiF-B2O3-ZnO glasses (original) (raw)

The present paper reports on the optical and spectral results of (0.5 mol %) Pr3+ or (0.5 mol %) Dy3+ ions containing Li2O-LiF- B2O3-ZnO (LBZ) glasses were prepared by a melt quenching technique. These glasses have shown strong absorption bands in visible and near infrared (NIR) regions. Pr3+: LBZ glass has exhibited six emission bands in the visible region at 3P0 3H4 (490 nm), 3P1 3H5 (532 nm), 1D23H4 (608 nm), 3P03F2 (652 nm), 3P03F3 (690 nm) and 3P03F4 (723 nm) on exciting at 446 nm (3H4  3P2) and a broad emission band 1D21G4 (1.46 μm) in the NIR region upon exciting with Ar+ laser (514.5 nm). In the case of Dy3+: LBZ glass, three emission bands are observed attributed to the transitions 4F9/26H15/2 (486 nm), 4F9/26H13/2 (577 nm) and 4F9/26H11/2 (662 nm) with an excitation 385 nm (6H15/26I13/2). The emission process has been explained from their energy level diagrams. Besides these, emission decay curves have been plotted for these prominent emission bands, in order to evaluate their emission lifetimes (τ).

Analysis of energy transfer based emission spectra of (Sm3+, Dy3+): Li2O–LiF–B2O3–CdO glasses

The present paper brings out the results concerning the preparation and optical properties of Sm3+ and Dy3+ each ion separately in four different concentrations (0.1, 0.5, 1.0 and 1.5 mol%) and also together doped (1 mol% Dy3+ + x mol% Sm3+): Li2O–LiF–B2O3–CdO (where x = 0.1, 0.5, 1.0 and 1.5 mol%) glasses by a melt quenching method. Sm3+ doped base glasses have displayed an intense orange emission at 602 nm (4G5/2-6H7/2) with an excitation at 403 nm and Dy3+ doped glasses have shown two emissions located at 486 nm (4F9/2-6H15/2; blue) and 577 nm (4F9/2-6H13/2; yellow) with λexci = 387 nm. The co-doped (Dy3+ + Sm3+) lithium fluoro-boro cadmium glasses have been excited with an excitation at 387 nm of Dy3+ which has resulted in with a significant reduction in Dy3+ emission, at the same time there exists an increase in the reddish-orange emission of Sm3+ due to an energy transfer from Dy3+ to Sm3+. The non-radiative energy transfer from Dy3+ to Sm3+ is governed by dipole–quadrupole interactions as is explained in terms of their emission spectra, donor lifetime, energy level diagram and energy transfer characteristic factors.

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