Tb3+/Yb3+ co-activated Silica-Hafnia glass ceramic waveguides

Effect of Dy3+ ions concentration on optical properties of lead borosilicate glasses for white light emission

“…Rare earth (RE) doped glasses, due to their high emission efficiencies have been studied by several researchers for the fundamental and technological applications in the fields of laser materials, sensors, scintillators, display devices, fiber amplifiers and waveguides [1][2][3][4]. Rare earth ions emit intense radiations in the ultraviolet (UV)-visible (VIS) and near infrared (NIR) regions due to the 4f → 4f and 4f → 5d transitions under different excitation wavelengths.…”

Red photonic glasses and confined structures

“…The amorphous and glass ceramic waveguides were prepared by sol-gel route using the dip-coating technique and a specific annealing procedure as reported in [23,29]. We demonstrated that glass ceramic increases the energy transfer efficiency compared to the parent glass as clearly shown in Table 2 [30]. This effect is a consequence of the reduction of non-radiative relaxation channels due to the low cut off frequency of HfO 2 nanocrystals that plays a capital role in the energy transfer efficiency between Tb 3+ and Yb 3+ ions.…”

“…During the last years several work has been performed in order to develop energy transfer based systems for photoluminescence application. In this scientific area we have upand down-converters planar waveguides for integrated optics [29], visible laser light sources and solar cells efficiency enhancement [21,30,31], specific nanostructured system used as sensitizers of rare earth luminescence [32]. Figure 4a- Figure 4a discusses a simple example where, starting from a visible photon, we can obtain two photons at 980 nm thanks to the Tb 3+ → Yb 3+ energy transfer.…”

Energy transfer mechanisms of quantum cutting near infrared luminescence in Ho3+/Yb3+ co-doped Y2O3 transparent ceramics

“…As for the acceptor, Yb 3+ is often selected for its high emission quantum efficiency at~1 μm, which falls well in the strongest spectrum response of the crystalline silicon solar cells. [10,11] Generally, there are mainly two kinds of mechanisms for the energy transfer process: 1) via the cooperative down-conversion emission, such as in the Tb 3+ /Yb 3+ co-doped and the Ce 3+ /Yb 3+ co-doped materials [12][13][14][15]; 2) via the multi-step photon emission which has been demonstrated in the Nd 3+ /Yb 3+ [16], the Er 3+ /Yb 3+ [17] and the Ho 3+ /Yb 3+ [10,18,19] co-doped materials.…”