The UV-phosphor strontium fluorooxoborate Sr[B5O7F3]:Eu

摘要

The fluorooxoborates Sr[B5O7F3] (Ccm21 (no. 36), Z?=?4, a?=?864.777(3) pm, b?=?1001.037(4) pm, c?=?810.110(5) pm, 630 refl., 68 param., RF?=?0.061, RBragg?=?0.051) and Sr[B5O7F3]:Eu2+ were synthesized via solid-state reactions from Sr(BF4)2 and B2O3. Doping was achieved by adding EuF3, which was reduced to its divalent state during the synthesis. Sr[B5O7F3] was investigated by infrared spectroscopy. Photoluminescence spectra of the doped compound revealed an Eu2+ 5d-4f emission in the UV regime peaking at 371 nm with a full width at half maximum (FWHM) of 21 nm upon excitation at 239 nm, which proves a weak coordination of europium by the anionic fluorooxoborate network.