Doping concentration dependence on VUV luminescence of Tm:CaF2

Concentration Dependence Study of VUV-UV-Visible Luminescence of Ndand Gd in LuLiF4

An overview of absorption and luminescence characteristics of Nd and Gd centers in a LiLuF4 single crystal host is provided. Single crystals doped with the above rare earth ions were prepared by micro-pulling-down technique in the form of rods a few cm long with a diameter of about 2 mm. Excitation and emission spectra and fast decay kinetics in VUV and UV spectral regions were measured at room...

Gallium concentration dependence of room-temperature near-band-edge luminescence in n-type ZnO:Ga

Doping concentration dependence of microstructure and magnetic behaviours in Co-doped TiO2 nanorods

Co-doped titanium dioxide (TiO2) nanorods with different doping concentrations were fabricated by a molten salt method. It is found that the morphology of TiO2 changes from nanorods to nanoparticles with increasing doping concentration. The mechanism for the structure and phase evolution is investigated in detail. Undoped TiO2 nanorods show strong ferromagnetism at room temperature, whereas inc...

Fluorine-doping concentration and fictive temperature dependence of self-trapped holes in Si O 2 glasses

Fictive temperature Tf and fluorine F -doping concentration dependences of self-trapped holes STHs in silica glasses created by UV irradiation at low temperatures have been studied by the electron-paramagnetic-resonance method. It was found that the yield of STH decreases with decreasing Tf and increasing F-doping concentration. In combination with infrared spectra measurements, the correlation...

Dependence of Upconversion Luminescence and Morphology on the Host Materials

Crystal structure, morphology, and optical properties of Tm, Er, and Yb ions doped four types of host materials [NaLnF4, Ln=Y, Lu, Gd, La] have been investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were used to characterize the samples. For La-based fluoride, the as synthesized microcrystals are assigned to LaF3 crystal phase. For the...