Valence state of europium doping ions during pulsed laser deposition

A. Pillonnet (1) , A. Pereira (1) , O. Marty , Corinne Champeaux (2)

1 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents
2 Axe 2 : procédés de traitements de surface

The evolution of europium as a doping ion during the pulsed-laser deposition process of Eu : Al2O3 films has been studied. A decrease in oxygen pressure in the deposition chamber generated the growth of γ-Al2O3 crystallites and a conversion of the 3+ to a 2+ valence state of europium ions. Excitation-selective emission of Eu2+ and fluorescence line narrowing of Eu3+ revealed that two kinds of europium site families were created in the alumina matrix. Time-of-flight emission spectroscopy shows that oxygen came preferentially from the target for the studied range of pressure

Mots clés: phase transformations; fluorescence properties; combustion synthesis; photoluminescence; alumina; Sol gel methods; thin films; optical properties

Domaines: Sciences de l'ingénieur [physics]

A. Pillonnet, A. Pereira, O. Marty, Corinne Champeaux. Valence state of europium doping ions during pulsed laser deposition. Journal of Physics D: Applied Physics, 2011, 44 (37), pp.375402. ⟨10.1088/0022-3727/44/37/375402⟩. ⟨hal-00674932⟩