Green up-conversion in Yb3+–Tb3+ and Yb3+–Tm3+–Tb3+ doped fluoro-germanate bulk glass and fibre

Upconversion luminescence of Yb3+/Tb3+/Er3+-doped fluorosilicate glass ceramics containing SrF2 nanocrystals

“…Due to the nano-size of the precipitated crystalline phase and the enrichment of rare earth ions into the nanocrystals, such glass ceramics presented enhanced luminescence behaviors [7][8][9], especially intense ultraviolet upconversion [10][11][12], and had high transparency. Those demonstrate them as potential candidate hosts of various optoelectronic devices [7,[13][14][15][16][17][18]. In the present work, multi-color upconversion luminescence has been obtained by adjusting the Yb 3+ /Tb 3+ /Er 3+ doping ratio in the glass ceramic system of SiO 2 -Al 2 O 3 -ZnF 2 -SrF 2 .…”

Up-conversion luminescence in germanate glass and double-clad optical fibre co-doped with Yb3+/Eu3+ ions

“…4) remains nearly unchanged. In comparison to Yb 3+ /Ho 3+ or Yb 3+ /Tm 3+ co−doped optical fibres where reabsorption of ASE (amplified spontaneous emission) sig− nal affecting the shape of emission spectra takes place, in a produced Yb 3+ /Eu 3+ -co−doped DC fibre this phenomenon does not occur [22,24]. However, in a glass fibre (0.1m length) UC emission at 616 nm ( 5 D 0 ® 7 F 2 ) becomes domi− nant (I 616nm /I 591nm = 4.17).…”

“…Figure 2 shows the luminescence decays from the 2 than in a tellurite and fluoro−germanate optical fibre [21,22]. Due to helical modes of pump radiation offset of the core from the centre of the fibre enables to improve efficiency of optical pumping of the double−clad optical fibre [23].…”

Active optical fibres for application in laser and broadband ASE sources

“…Relying on the spectral measurements, a diagram illustrating energy states of the Yb 3+ /Tb 3+ configuration in the germanium glass was created where the key mechanisms of quantum transitions were presented (Fig. 14) pairs impose a limit on the concentration of dopants [47]. The relationship between luminescence intensity and pumping power in the analyzed germanium glass allows to investigate the mechanisms of up-conversion.…”