A structural approach of the flux effect on blue phosphor BAM:Eu (BaMgAl10O17:Eu2+)

Arnold Lacanilao (1) , Gilles Wallez (1) , Leo Mazerolles (2) , Valerie Buissette (3) , Thierry Le Mercier (3) , Franck Aurissergues (3) , Marie-France Trichet (2) , Nicolas Dupre (4) , Bertrand Pavageau (5) , Laurent Servant (6) , Bruno Viana (1)

1 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)
2 UMR GESTE - Gestion Territoriale de l'Eau et de l'environnement
3 Centre de Recherches d'Aubervilliers
4 IMN - Institut des Matériaux Jean Rouxel
5 LOF - Laboratoire du Futur
6 ISM - Institut des Sciences Moléculaires

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.

Mots clés: Oxides; Luminescence; X-ray diffraction; Crystal structure; Optical Materials

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Arnold Lacanilao, Gilles Wallez, Leo Mazerolles, Valerie Buissette, Thierry Le Mercier, et al.. A structural approach of the flux effect on blue phosphor BAM:Eu (BaMgAl10O17:Eu2+). Materials Research Bulletin, 2013, 48 (8), pp.2960. ⟨10.1016/j.materresbull.2013.04.044⟩. ⟨hal-00950579⟩