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Óxido misto de ítrio-alumínio dopado com Eu(III)

2005; Brazilian Chemical Society; Volume: 28; Issue: 2 Linguagem: Inglês

10.1590/s0100-40422005000200014

1678-7064

Eduardo J. Nassar, Lilian R. Ávila, Paula F. S. Pereira, Omar José de Lima, Lucas A. Rocha, César Mello, Kátia J. Ciuffi, Luís D. Carlos,

Luminescence Properties of Advanced Materials

05Eu(III)-DOPED ALUMINIUM YTTRIUM OXIDE.In this work, we report the synthesis and the photoluminescence features of Eu(III)-doped yttrium-aluminium oxide obtained by non-hydrolytic sol-gel routes.After heating the powders above 600 o C the XRD patterns show the presence of the Y 4 Al 2 O 9 (YAM) and Y 3 Al 5 O 12 (YAG) phases.At 800 and at 1500 o C the PL spectra display the Eu(III) lines characteristic of the YAM monoclinic phase.The 5 D 0 → 7 F 2 transition is favored relatively to the 5 D 0 → 7 F 1 lines.However, at 1100 o C the cubic YAG is the preferential phase and the 5 D 0 → 7 F 1 transition dominates the spectrum.The Eu(III) ions lie in a centrosymmetrical site.The different solvents used in the sol-gel synthesis also change the relative proportion between these two phases.This is monitored analyzing the modifications in the relative intensity between the 5 D 0 → 7 F 2 and the 5 D 0 → 7 F 1 transitions.