Morphological and Luminescent Characteristics of ZnO Nanopowders Doped with Europium
Zinc oxide was obtained by combustion reaction synthesis method using microwaves energy to provide ignition to the mixture of zinc nitrate, europium and urea. The influence of the europium concentration on the structure, morphology and luminescence characteristics of the ZnO powders was investigated. The proportion of each reagent and fuel was calculated based on the propellants chemistry concepts. The solutions were mixed in a vitreous silica basin and submitted of external heating in a microwaves oven until self-ignition occurred. The resulting powders were characterized by X-ray diffractometer (XRD), granulometric distribution, scanning electronic microscopy (SEM) and emission spectroscopy. The XRD results showed the formation of ZnO:Eu3+ as main phase and Eu2O3 as secondary phase. The powder presented morphology constituted of fine particles agglomerates (<100nm) and red luminescence characteristic from Eu3+ ion.
Lucio Salgado and Francisco Ambrozio Filho
T.S. Barros et al., "Morphological and Luminescent Characteristics of ZnO Nanopowders Doped with Europium", Materials Science Forum, Vols. 591-593, pp. 745-749, 2008