Spectroscopic properties of tetragonal LiYbF_4 nanocrystals under high dense NIR excitation at vacuum condition were investigated. White, broad band emission covering whole visible part of the spectrum from LiYbF_4 na...Spectroscopic properties of tetragonal LiYbF_4 nanocrystals under high dense NIR excitation at vacuum condition were investigated. White, broad band emission covering whole visible part of the spectrum from LiYbF_4 nanocrystals was observed. Its intensity strongly depended on the excitation power, excitation wavelength and ambient pressure. Temperature of the nanocrystals under 975 nm excitation was determined as a function of excitation power. Strong photo-induced current was observed from LiYbF_4 pallet. The emission kinetic was analyzed. The mechanism of the anti-Stokes white emission was discussed in terms of the laser-induced charge transfer emission from Yb^(2+) states.展开更多
Near-infrared emission of Yb3+ and Bi3+-co-doped GdVO4 vanadate phosphors obtained via the modified Pechini's method was reported. The phase purity and structure of samples were characterized by X-ray powder diN'a...Near-infrared emission of Yb3+ and Bi3+-co-doped GdVO4 vanadate phosphors obtained via the modified Pechini's method was reported. The phase purity and structure of samples were characterized by X-ray powder diN'action (XRD), X-ray energy disper- sion spectroscopy (EDS), scanning electron microscopy (SEM), Raman and infrared (IR) spectroscopy. Photoluminescence emission (PL) and excitation (PLE) spectra were recorded and investigated in details. Results indicated that upon near-UV excitation (340 nm) in the (Bi3+-V5+) charge transfer state this phosphor had a strong broad band yellow-green emission (3Pi--ISo) of Bi3+ ions and also NIR emission (2Fs/2-2Fv/2) of Yb3+ ions in the range of 950-1050 nm, which matched well with the spectral response of the sili- con-based solar cells. The decreasing Bi3+ emission with increasing Yb3+ concentration proved the occurrence of energy transfer from Bi3+ to Yb3+ ions. Results demonstrated that Yb3+ and Bi3+-co-doped GdVO4 vanadate phosphors might act as a NIR down-conversion (DC) solar spectral converter to enhance the efficiency of the silicon-based solar cells.展开更多
基金supported by National Centre of Science(NCS)Project(Poland)(NCN-2012/06/A/ST5/00212)
文摘Spectroscopic properties of tetragonal LiYbF_4 nanocrystals under high dense NIR excitation at vacuum condition were investigated. White, broad band emission covering whole visible part of the spectrum from LiYbF_4 nanocrystals was observed. Its intensity strongly depended on the excitation power, excitation wavelength and ambient pressure. Temperature of the nanocrystals under 975 nm excitation was determined as a function of excitation power. Strong photo-induced current was observed from LiYbF_4 pallet. The emission kinetic was analyzed. The mechanism of the anti-Stokes white emission was discussed in terms of the laser-induced charge transfer emission from Yb^(2+) states.
文摘Near-infrared emission of Yb3+ and Bi3+-co-doped GdVO4 vanadate phosphors obtained via the modified Pechini's method was reported. The phase purity and structure of samples were characterized by X-ray powder diN'action (XRD), X-ray energy disper- sion spectroscopy (EDS), scanning electron microscopy (SEM), Raman and infrared (IR) spectroscopy. Photoluminescence emission (PL) and excitation (PLE) spectra were recorded and investigated in details. Results indicated that upon near-UV excitation (340 nm) in the (Bi3+-V5+) charge transfer state this phosphor had a strong broad band yellow-green emission (3Pi--ISo) of Bi3+ ions and also NIR emission (2Fs/2-2Fv/2) of Yb3+ ions in the range of 950-1050 nm, which matched well with the spectral response of the sili- con-based solar cells. The decreasing Bi3+ emission with increasing Yb3+ concentration proved the occurrence of energy transfer from Bi3+ to Yb3+ ions. Results demonstrated that Yb3+ and Bi3+-co-doped GdVO4 vanadate phosphors might act as a NIR down-conversion (DC) solar spectral converter to enhance the efficiency of the silicon-based solar cells.