Author/Authors :
Lacanilao، نويسنده , , Arnold and Wallez، نويسنده , , Gilles and Mazerolles، نويسنده , , Léo and Buissette، نويسنده , , Valérie and Le Mercier، نويسنده , , Thierry and Aurissergues، نويسنده , , Franck and Trichet، نويسنده , , Marie-France and Dupré، نويسنده , , Nicolas and Pavageau، نويسنده , , Bertrand and Servant، نويسنده , , Laurent and Viana، نويسنده , , Bruno، نويسنده ,
Abstract :
In the aim of understanding the relations between the spectroscopic properties of blue phosphor BaMgAl10O17:Eu2+ and its crystal structure, microstructure and chemical composition, three fluoride fluxes (LiF, MgF2 and NH4F) have been added before final thermal treatment and their effect analyzed. LiF changes the polycrystalline and spherical grains into hexagonal platelets without significant cations exchange and improves the luminescence. NH4F and MgF2 only have a limited effect, the former because of its low point of decomposition, the latter because of the formation of spurious MgAl2O4 that reduces the luminescence. In a general way, re-crystallization results in variations of the dopant distribution between the three host sites of the structure. Chromaticity is only faintly affected, but important variations of the absorption and excitation spectra are observed, allowing a strong increase of photoluminescence intensity under near-UV excitation.
Keywords :
A. Oxides , D. Crystal structure , A. Optical materials , C. X-ray diffraction , D. Luminescence
