Eu(III)-doped aluminium yttrium oxide

摘要

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 ?oC the XRD patterns show the presence of the Y4Al2O9 (YAM) and Y3Al5O12 (YAG) phases. At 800 and at 1500 ?oC the PL spectra display the Eu(III) lines characteristic of the YAM monoclinic phase. The 5D0®7F2 transition is favored relatively to the 5D0®7F1 lines. However, at 1100 ?oC the cubic YAG is the preferential phase and the 5D0®7F1 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 5D0®7F2 and the 5D0®7F1 transitions.