Akademik Veri Yönetim Sistemi
Journal of Alloys and Compounds, cilt.583, ss.91-95, 2014 (SCI-Expanded)
The authors report here the luminescence properties of strontium aluminate doped with dysprosium and manganese. The dysprosium, manganese co-doped powders were prepared by a solid state reaction at temperatures at 1600 C under H 2 (15%)-Ar (85%) atmosphere. The dysprosium, manganese co-doped strontium aluminate phosphors have the monoclinic structure with lattice parameters a ≈ 8.440 Å, b ≈ 8.821 Å, c ≈ 5.157 Å and β ≈ 93.4. The characteristic 4F9/2 → 6H15/2 (blue), 4F9/2 → 6H13/2 (yellow), 4F9/2 → 6H11/2 (red) and 4F9/2 → 6H9/2 (NIR) transitions of Dy3+ for different luminescence techniques (radioluminescence, photoluminescence and cathodoluminescence) were detected in the emission spectra at the room temperature. The luminescence of Mn2+ co-doped SrAl2O 4:Dy3+ exhibits a broad green-orange emission band ( 4T1 → 6A1 transition) from the synthesized phosphor particles under different excitation sources. This corresponds to the spin-forbidden transition of the d-orbital electron associated with the Mn2+ ion. Multiple emission lines observed at each of these techniques are due to the crystal field splitting of the ground state of the emitting ions. The nature of the emission lines is discussed. © 2013 Elsevier B.V. All rights reserved.