Upconversion luminescence in Er3+-doped germanate-oxyfluoride and tellurium-germanate-oxyfluoride transparent glass-ceramics

Full color photoluminescence of Tb3+/Sm3+ codoped oxyfluoride aluminosilicate glasses and glass ceramics for white light emitting diodes

“…The low PE in turn leaded to low non-radiative loss and thus obtained high quantum efficiency of fluorescence. This explanation is in excellent agreement with previous studies on germanium glasses [8,17,18]. :…”

“…REI doped oxyfluoride glasses have been widely investigated in the past few decades, because they combine the advantages of the high mechanical strength of oxide glasses and the low phonon energy of fluoride glasses [5][6][7][8][9]. Nowadays, some researches have been focused on the possible applications of these glasses in the fabrication of W-LEDs.…”

Green and red fluorescence upconversion in neodymium-doped low phonon antimony glasses

“…The energy gap of 2 D 5/2 → 4 G 11/2 and 4 F 3/2 → 4 F 7/2 levels are well matched with a small (about 210 cm −1 ) red shift. According to the Frank-Condon principle and lattice relaxation theory, a small red shift between the above two transitions is favorable to this kind of ET [45]. Other possible CET schemes responsible for population of the metastable radiative 4 G 7/2 level are:…”

Structure and thermal behaviour of Sr-doped (NH4)2TeBr6 material

“…Most compounds in this family crystallize at room temperature in the cubic antifluorite K 2 PtCl 6 structure with Fm3m (O 5 h ) space group. The K 2 TeCl 6 compound [1] is the only exception. It has the same structure but at higher temperature, because of the small size of K + cations.…”

“…This is partly due to the lone pairs of tellurium atoms which are generally stereochemically active and which confer good non-linear optical properties on the materials. Tellurium A 2 TeX 6 salts (A being an alkali metal and X an halogen) and tellurium dopped compounds are promising for glass and rubber applications since they exhibit interesting physical and magnetic properties like luminescence, piezoelectric and ferroelectric [1][2][3][4][5][6]. Most compounds in this family crystallize at room temperature in the cubic antifluorite K 2 PtCl 6 structure with Fm3m (O 5 h ) space group.…”