Powerful visible upconversion fluorescence of Er3+ in novel bismuth gallate glasses compared with in common tellurite glasses

Synthesis and up-conversion luminescence properties of Er3+/Yb3+ co-doped Sr2CeO4 phosphors

“…However, its relatively low absorption cross-section of 1.7 × 10 −21 cm 2 makes its ground state absorption (GSA) at 975 nm very weaken weak, leading to a the reduction in the emission intensity and pump efficiency [10]. To overcome these drawbacks and enhance the UC emission efficiency, Yb 3+ ions are generally used as co-doped ions because they have a due to their large absorption cross-section of 11.7 × 10 −21 cm 2 around 980 nm and can efficiently transfer the excitation energy to other activators [11][12][13][14][15]. Therefore, the Yb 3+ -Er 3+ couple is also used to produce visible green or red UC emission [16].…”

Pure red upconversion emission from Yb3Al5O12 phase doped with high Er3+ concentration

“…Energy transfer from Yb 3+ ions to Er 3+ ions enhances the efficiency of the upconversion emission drastically [20,21]. Although fluoride [22] and tellurite [23] with low phonon energy attracted more attention, compared to them, alumina as a host is of better thermal stability, durability and anti-chemical-corrosion [24]. The alumina would serve in worse environment, and at the same time, it was the main raw materials to prepare the garnet compositions such as YAG and Yb 3 Al 5 O 12 (YbAG) [25,26] which possess excellent optical property, so the alumina would be a nice host material for upconversion.…”

Studies of the spectroscopic properties of lead–gallium oxyfluoride (LGOF) glasses and glass–ceramics activated by Pr 3+ ions

“…Thus, improvement of the luminescence properties can be achieved only if the optically active ions are incorporated into the low phonon phase which is formed during crystallization. Glass doped with rare earth elements are widely used in laser technology and optoelectronics [8][9][10][11][12][13][14]. Heavy metal oxides doped with selected rare earth elements were the subject of interest for a couple of decades.…”