Measurement of up-conversion energy-transfer probabilities in Ho:Y3Al5

Efficient oxide phosphors for light upconversion; green emission from Yb3+and Ho3+co-doped Ln2BaZnO5(Ln = Y, Gd)

“…It has a relatively long-lived 5 I 7 level that can act as a population reservoir for upconversion processes. Upconversion of Ho 3+ has been widely reported under 650 nm, [19][20][21] 750 nm [22][23][24][25] and 875 nm 26,27 excitations, but often with poor efficiency. Higher upconversion efficiencies have been achieved in materials co-doped with Yb 3+ and Ho 3+ , where Yb 3+ acts as a sensitizer for Ho 3+ owing to its strong absorption around 980 nm.…”

Energy transfer up-conversion in Tm3+-doped silica fiber

“…Extensive studies have been carried out on the cross relaxation process ( This process has been observed in thulium doped crystals [8][9][10]. However, in some cases, the sharp spectral lines associated with these materials results in a lack of spectral overlap between the …”

Optical spectroscopy and frequency upconversion properties of Tm3+ doped tungstate fluorophosphate glasses

“…[1][2][3] Frequency upconversion in a variety of Tm 3ϩ doped materials was also investigated in the past. [6][7][8][9][10][11][12][13] Of particular interest is the possibility of obtaining strong blue emission from Tm 3ϩ doped materials pumped in the red and in the infrared. Upconversion laser emission and amplified spontaneous emission studies have been reported for Tm 3ϩ doped optical fibers and channel waveguides.…”