Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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S.Chenu, E.Veron, C.Genevois, A.Garcia, G.Matzen, M.Allix, 'Long-lasting luminescent ZnGa2O4:Cr3+ transparent glass-ceramics', J. Mater. Chem. C 2 10002-10010 (2014) doi:10.1039/c4tc02081b

Highly transparent ZnGa2O4 glass-ceramic materials are elaborated via a simple heat treatment of a 55SiO2 - 5Na2O - 17ZnO - 23Ga2O3 parent glass composition which presents nanoscale spinodal phase separation. This optimized glass-ceramic exhibits 50 wt% of ZnGa2O4 nanocrystals showing an homogeneous and tuneable size. To describe the crystallization process, the glass and glass-ceramic nanostructures are studied by high resolution scanning transmission electron microscopy analysis coupled to in situ high temperature X-ray diffraction and optical measurements. From these results, an original mechanism is proposed to explain the crystallization process occurring in a spinodal phase separated glass. Remarkably, red long-lasting luminescence arising from the whole sample volume is observed in the Cr3+ doped transparent glass-ceramics, opening the route to a wider range of performing applications for this famous zinc gallate persistent phosphor.