Structural and photoluminescence properties of Eu3+-doped (Y2.99-xGdx)Al5O12 phosphors under vacuum ultraviolet and ultraviolet excitation
| Autor: | Patresio A.M. Nascimento, Ariosvaldo J.S. Silva, Danilo O. Junot, Marcos V. dos S. Rezende, D.V. Sampaio, Lílian M. Jesus, T.R. Cunha, Ronaldo Santos da Silva, Iure da S. Carvalho, Amanda I. dos S. Barbosa, Adriano B. Andrade |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science Doping Analytical chemistry Phosphor 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease_cause 01 natural sciences 0104 chemical sciences symbols.namesake Lattice constant medicine symbols General Materials Science 0210 nano-technology Raman spectroscopy Luminescence Ultraviolet |
| Zdroj: | Materials Chemistry and Physics. 228:9-14 |
| ISSN: | 0254-0584 |
| Popis: | Eu-doped (Y2.99-xGdx)Al5O12 phosphors (with x = 0, 0.5, 1, 1.5, 2, 2.5, and 2.99) were prepared by a sol-gel method using polyvinylalcohol (PVA) as gel agent. The crystal structures were characterized through X-ray diffraction and the resulting data were refined by the Rietveld method, which shows a linear increase of the lattice parameter with the Gd content. Further structural characterization was carried out via Raman spectroscopy. The effect of substituting Y3+ by Gd3+ on the Eu-doped Y3Al5O12 (YAG) photoluminescence properties was investigated using vacuum ultraviolet (VUV) and ultraviolet (UV) excitation. The excitation and emission spectra of the produced (Y2.99-xGdx)Al5O12 phosphors indicate that their luminescence properties are strongly dependent on the Gd3+ substitution. Our results also reveal a nonlinear decrease in the band-gap of these materials by increasing the Gd concentration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect