Composition dependence of the optical and structural properties of Eu-doped oxyfluoride glasses

摘要: Abstract Europium doped oxyfluoride glasses were prepared by the melt quenching method for light emitting diodes applications. The optical and structural properties of these studied means photoluminescence spectra, Commission Internationale de L’Eclairage chromaticity coordinates, X-ray diffraction, Fourier transform infrared spectra. We find that spontaneous reduction Eu 3+ to 2+ is realized ions occupying sites Ca in air atmosphere. conversion efficiency, performances structure strongly depend on base glass compositions. For certain compositions, CaF 2 crystals can form during cooling process, thereby enhance from . formation be suppressed adding CaO, Al O 3 B , but enhanced Na K Finally, we propose a mechanism explain how affects as well glasses.