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Abstract
AbstractThe glass structure and photoluminescence of new oxyfluoride glasses with the composition ofxMgF2–(66.7−2x/3)BaO–(33.3−x/3)B2O3(x = 10‐50 mol%) were investigated in this work. The structure of the glasses was investigated by magic‐angle spinningNMR,XAS, and Raman scattering spectroscopies. It was revealed that the glasses are mainly composed ofBO3units with a disconnected borate network consisting mainly of ortho‐ and pyro‐borate units, and ortho‐borate increases with the addition of MgF2. The fluorine atoms are surrounded by Mg2+and Ba2+ions. The photoluminescence of Eu3+‐doped samples were investigated. It was indicated that asymmetry of the Eu3+site increased with the addition of MgF2. The photoluminescence quantum yield (η) of the glasses are very high and increased with MgF2addition; red photoluminescence is observed withη = 82% for 10MgF2andη = 98% for 50MgF2for excitation at 393 nm.
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