Abstract
Influence of the trivalent dysprosium ion on the structure and luminescent properties of Gd1-xSr2AlO5:xDy3+ (x = 1–6 mol %) phosphors were examined. Creation of structures, photoluminescence efficacy, optical characteristics and energy transfer were all carefully inspected. X-ray diffraction patterns endorse single phase formation of all fabricated samples with tetragonal structure having space-symmetry of I4/mcm (space group No. 140). SEM and TEM investigation validates the good morphology which having particle in nanorange. EDX analysis affirms the formation of material with proper stoichiometry. The excitation spectrum of the optimum sample contains absorption peaks corresponding to the Gd3+ as well as Dy3+ ions and sharp and intense peak of Gd3+ ion in comparison to the Dy3+ ion, confirms the occurrence of significant energy transfer between Gd3+ and Dy3+ ions. The Dy3+ ions transitions 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 were identified in the PL spectra at an excitation of 351 nm as bluish, yellowish and reddish bands at 488, 582 and 669 nm respectively. Due to charge transference from Gd3+ to Dy3+ ions, fabricated materials under Gd3+ excitation (272 nm) showed emission peaks owing to both the Gd3+ and Dy3+ transition. Concentration quenching with respect to the luminescence performance occurs due to the quadrupole-quadrupole interactions between nearest activator ions. Photometric characteristics were also evaluated in order to define whether the phosphors are appropriate for white light emitting diodes.
Published Version
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