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

Química Nova

Eduardo J. Nassar²  Lilian R. Avila²  Paula F. S. Pereira²  Omar J. De Lima²  Lucas A. Rocha²  Cesar Mello²  Katia J. Ciuffi²  Luis D. Carlos¹ 

[1] ,Universidade de FrancaFranca SP

关键词: YAG;    Eu III;    sol-gel;   

DOI  :  10.1590/S0100-40422005000200014

来源: SciELO

【 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.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License