Synthesis And Research On The Upconversion Luminescent Properties Of Rare-Earth Doped Compound Fluoride Nanoparticles

Rare earth luminescent materials are widely used in color display and medical equipment etc. Rare earth up-conversion luminescent materials in are widely used in the fields of military night vision, infrared detection, biological probes and forward the rapid development of other emerging fields.In this paper, a series of nanoparticles which have regularly morphology about BaZnF4: Yby, Er0.04(y = 0.1, 0.2, 0.3, 0.4, 0.6 and 0.8), BaZnF4: Yb0.2 Erx(x = 0.02, 0.03, 0.04, 0.05, 0.06 and 0.08); CaZnF4: Yb0.2 Erx(x = 0.01, 0.02, 0.03, 0.04, 0.06 and 0.08), CaZnF4: Yby(y = 0.1, 0.2, 0.3, 0.4, 0.6 and 0.8) Er0. 02 and Sr ZnF4: Yb0.2 Erx(x = 0.01, 0.02, 0.03, 0.04, 0.06 and 0.08), SrZnF4: Yby(y = 0.1, 0.2, 0.3, 0.4, 0.6 and 0.8) Er0.02 were synthesized by thermal decomposition. The samples’ phase were analyzed by X- ray powder diffraction(XRD) produced by Rigaku. The samples’ morphology was observed and its sizes were measured by transmission electron microscope(TEM) produced and the samples’ composition was analyzed by electron spectroscopy(EDS). The samples’ emission spectras were tested by fluorescence spectrometer produced by the samples’ light-emitting properties were studied.(1) Rare earth doped nanoparticles BaZnF4: Yb3+, Er3+ are synthesized by thermal decomposition method. The average particle size is about 8 nm,which can be seen from XRD spectrogram. The TEM images showed that the morphology of the samples is spherical and the average particle size is about 8 nm corresponding to the tested results, and the lattice spacing is 0.3165 nm, which is corresponding to tetragonal BaZnF4(224) nanoparticles’ plane lattice space. Dependence of the upconversion emission spectrogram, 20%(mol) of sensitizer Yb3+ and 4%(mol) of activator Er3+ was the best doping concentration of samples. From the excitation power of nanoparticles BaZnF4: Yb0.2Er0.04 and the relationship images of red and green emission intensity can be seen, the slope of the line of green and red emission band with double logarithmic fitting all belong to the two-photon energy absorption process.(2) Rare earth doped nanoparticles CaZnF4: Yb3+, Er3+ are synthesized by thermal decomposition method. The average particle size is about 17 nm,which can be seen from XRD spectrogram. The morphology of the sample is square and the average particle size is about 17 nm, which can be known from TEM images coincide with the lattice space of 0.3969 nm, tetragonal CaZnF4(332) nanoparticles’ plane lattice space. Dependence of the upconversion emission spectrogram, 20%(mol) of sensitizer Yb3+ and 2%(mol) of activator Er3+ was the best doping concentration of samples. From the excitation power of nanoparticles CaZnF4:Yb0.2Er0.02 and the relationship images of red and green emission intensity can be seen, the slope of the line of green and red emission band with double logarithmic fitting all belong to the two-photon energy absorption process.(3) Rare earth doped nanoparticles SrZnF4: Yb3+, Er3+ are synthesized by thermal decomposition method. The average particle size is about 18 nm,which can be seen from XRD spectrogram. The morphology of the sample is square and the average particle size is about 18 nm, which can be known from TEM images coincide with the lattice space of 0.3580 nm, tetragonal SrZnF4(136) nanoparticles’ plane lattice space. Dependence of the the up-conversion emission spectrogram, 20%(mol) of sensitizer Yb3+ and 2%(mol) of activator Er3+ was the best doping concentration of samples. From the excitation power of nanoparticles SrZnF4:Yb0.2Er0.02 and the relationship images of red and green emission intensity can be seen, the slope of the line of green and red emission band with double logarithmic fitting all belong to the two-photon energy absorption process.