Photoluminescent properties of Dy3+-activated REAl3(BO3)4 (RE=Y, La, Gd) polycrystalline phosphors from hybrid precursors
2007; Elsevier BV; Volume: 462; Issue: 1-2 Linguagem: Inglês
10.1016/j.jallcom.2007.07.109
ISSN1873-4669
Autores Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoDysprosium-activated REAl3(BO3)4 (RE = Y, La, Gd) polycrystalline phosphors were synthesized via in situ sol–gel process using urea as fuel and metal nitrates as precursors. The uniformity phase of the phosphors was checked by X-ray diffraction (XRD) technique. Scanning electron microscopy (SEM) investigations were carried out to study the surface morphological features and the particle size of the phosphor after heat treatment at 1000 °C. The excitation spectra show strong spectral bands in region of 220–450 nm. The characteristic transitions of Dy3+ due to 4F9/2 → 6H15/2 (blue) and 4F9/2 → 6H13/2 (yellow) were observed in the emission spectra and the yellow-to-blue intensity ratio changed with the variety of the doped concentration of Dy3+. The results can be benefit for the white-color luminescent materials.
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