Spectroscopic properties and energy transfers in Tb3+/Ho3+/Yb3+ tri-doped oxyfluoride silicate glasses

Spectral properties and self-reduction of Eu3+ to Eu2+ in aluminosilicate oxyfluoride glass

“…10,11,14 Aluminosilicate oxyuoride glasses and glass-ceramics containing two kinds of anions (O 2− and F − ) with different valence electrons and different degrees of polarization is another kind of promising host for RE ions because they combine the advantages of the high mechanical strength of oxide glass and the low phonon energy of uoride glass. [14][15][16] Still, instead of the high-performance narrow-band emissions in Eu 2+ -activated phosphors for some special applications (e.g., uorescent illumination and X-ray intensifying panels), 17,18 divalent europium ions generally emit only a broad band blue emission in vitreous hosts. 19,20 In other words, the amorphous structure of glass, which resulting in a higher phonon energy, enhances the overlap of electronic orbit among energy levels in 4f 6 5d conguration, i.e., the broad blue emission originates in the minor splitting energy of Eu 5d-band.…”

Different dominant transitions in holmium and ytterbium codoped oxyfluoride glass and glass ceramics originating from varying phonon energy environments

“…However, large maximum phonon energies of silicate glasses set an upper limit on the emission wavelength and induce multiphonon assisted non-radiative decay, which is mainly responsible for unsatisfied emission efficiency 16 . Even oxyfluoride silicate glass, which is a kind of silicate glass with the incorporation fluoride, could not solve this problem effectively 19 . Fortunately, transparent oxyfluoride silicate glass ceramics are capable of well solving this intrinsic difficulty attributed to embedded fluoride nanocrystals, which have superb fluorescent emission efficiency in mid-infrared region owing to its low phonon energies 20,21 .…”