Spectroscopies of photoluminescence and excitation of MgGa2O4 samples doped with Mn2+. / Espectroscopia de fotoluminescência e excitação de amostras MgGa2O4 dopadas com Mn2+
AUTOR(ES)
Greice Kelly Bezerra da Costa
DATA DE PUBLICAÇÃO
2009
RESUMO
This work presents the room temperature photoluminescence and excitation spectroscopes data of MgGa2O4 samples doped with 0.5% and 10.0% Mn2+. The polycrystalline samples were produced by solid-state reaction at high temperature and characterized with X ray Diffraction and SEM. The photoluminescence spectra showed emission at green and red spectral regions, for both doping levels and were analyzed based on the Tanabe-Sugano Theory. The emissions were attributed to 4T1(4G) → 6A1(6S) spin-forbidden electronic transition of Mn2+ impurity ions in tetrahedral (green emission) and octahedral (red emission) oxygen coordinated sites. From excitation spectra, we identified the energy transitions and from Tanabe-Sugano matrices we calculated the crystal field and Racah parameters.
ASSUNTO(S)
ceramics, mn2+ excitação cerâmica fotoluminescência excitation. fisica da materia condensada photoluminescence mn2+
ACESSO AO ARTIGO
http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1084Documentos Relacionados
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