Eu(III)-doped aluminium yttrium oxide.

authors	Nassar, EJ; Avila, LR; Pereira, PFS; de Lima, OJ; Rocha, LA; Mello, C; Ciuffi, KJ; Carlos, LD
nationality	International
journal	QUIMICA NOVA
author keywords	YAG; EuIII; sol-gel
keywords	SOL-GEL METHOD; SPECTRA; HYBRIDS; MATRIX; ROUTE
abstract	Eu(Ill)-DOPED ALUMINIUM YTTRIUM OXIDE. In this work, we report the synthesis and the photoluminescence features of Eu(Ill)-doped yttriurn-aluminium oxide obtained by non-hydrolytic sol-gel routes. After heating the powders above 600 degrees C the XRD patterns show the presence of the Y4Al2O9 (YAM) and Y3Al5O12 (YAG) phases. At 800 and at 1500 degrees C the PL spectra display the Eu(III) lines characteristic of the YAM monoclinic phase. The D-5(0)->F-7(2) transition is favored relatively to the D-5(0)->F-7(1) lines. However, at 1100 degrees C the cubic YAG is the preferential phase and the D-5(0)->F-7(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 D-5(0)->F-7(2) and the D-5(0)->F-7(1) transitions.
publisher	SOC BRASILEIRA QUIMICA
issn	0100-4042
year published	2005
volume	28
issue	2
beginning page	238
ending page	243
digital object identifier (doi)	10.1590/S0100-40422005000200014
web of science category	Chemistry, Multidisciplinary
subject category	Chemistry
unique article identifier	WOS:000228184500014