Abstract
The ionic transportation and dielectric properties of YF3:Eu3+ nanocrystals are investigated by AC impedance spectroscopy. The ion diffusion coefficient and conductivity increase along with the doping concentration and reach their highest values at 4% of Eu3+. The difference of ionic radius between Eu3+ and Y3+ leads to the structural disorder and lattice strain, which deduces the increase of the ion diffusion coefficient and conductivity before 4% Eu3+ doping; then the interaction of the neighboring doping ions is dominated, which results in the difficulty of ion migration and decreases of the ion diffusion coefficient and conductivity. The strong dispersion of the permittivity in the low frequency region indicates that the charge carrier transport mechanism is the ion hopping in the system. The low-frequency hopping dispersion is affected by an interfacial polarization, which exhibits a Maxwell-Wagner relaxation process, and its loss peak shifts to higher frequency with the ionic conductivity increasing.
Highlights
Rare-earth fluoride nanomaterials have attracted a great deal of interest due to their unique physical and chemical properties and potential applications in luminescence, optoelectronic, down/up conversion devices, etc. [1–6]
The structure, component and morphology of YF3:Eu3+ nanocrystals were measured by XRD, EDS and TEM
The ionic transportation and dielectric properties of YF3:Eu3+ nanocrystals are investigated by AC impedance spectroscopy
Summary
Rare-earth fluoride nanomaterials have attracted a great deal of interest due to their unique physical and chemical properties and potential applications in luminescence, optoelectronic, down/up conversion devices, etc. [1–6]. Rare-earth fluoride nanomaterials have attracted a great deal of interest due to their unique physical and chemical properties and potential applications in luminescence, optoelectronic, down/up conversion devices, etc. Among the rare earth fluorides, YF3 is an important material and has widespread potential applications in optical telecommunication, phosphors, down/up conversion luminescent devices, solid-state batteries, sensors [6–14], etc. YF3 is an attractive host material for lanthanide-doped phosphors. Due to its high ionic conduction, YF3 is a prospective material used as a solid electrolyte of solid-state electrochemical devices. As the phosphor host and solid electrolyte material, the ionic conductivity and dielectric properties of YF3 nanocrystals are important subjects. Many investigations have been focused on the structure, synthesis and optical properties of YF3 nanocrystals [8–11,19–21]. Few reports have been conducted on the electrical and dielectric properties of YF3. TbryanAspCoirmtaptieodnanancedsdpieecletrcotrsiccoppryo.pTehretiieosnoicf YdiFf3fu:Esuio3n+,nioannoicccryosntdaulscatirveitiynvaensdticgoamtepdlebxypAeCrmimittpiveidtaynacree sdpiesccutrsossecdopwyi.thTvhaeriioonuiscEdui3f+fudsoiponin,giocnoinccceonntrdauticotnivsi.ty and complex permittivity are discussed with various Eu3+ doping concentrations
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