The Synthesis and Luminescent Properties of Rare Earth Doped in Aluminoborate Phosphors

The Synthesis and Luminescent Properties of Rare Earth Doped in Aluminoborate Phosphors
　　Aluminoborate phosphors have not only the very strong absorption in the VUVscope, but also the good bearing to the vacuum ultraviolet ray exposure and theanti-ion bombardment. Moreover it has many characteristic for good thermostability,low synthesis temperature and high efficient luminescence.This paper made up by two kind of aluminoborate matrix of SrAl2B2O7 and YAl3(BO3) 4 synthesized by sol-gel method.And it obtains highly efficient red and greenaluminoborate luminescent materials. It makes a consideration on the best synthesiscondition, like the rare earth ionic radius, the concentration quenching, the synthesistemperature, time, atmosphere and matrix composition effects on the luminousperformance. In this paper, Mn2+ doped ZnS nanoparticles were also synthesized by ahydrothermal method.
　　All the work and summary induction as follows:1.Cylinder neodymium magnet  The synthesis and luminescent properties of rare earth doped in SrAl2B2O7 hosts.The hosts SrAl2B2O7 single-cubic phase were fabricated by the sol-gel method. Itmakes a discussion on the concentration quenching, the synthesis temperature, time,atmosphere and matrix composition effects on the luminous performance when therare earth Eu3+, Tb3+ and non-rare earth Ba2+,Ca2+,Gd3+,Li+ doped in SrAl2B2O7 hosts.①The structures of the phosphors were characterized by XRD. The dopingcontent of Eu3+ ions in SrAl2B2O7: Eu3+ phosphors are 1%, 4%, 6%, 8%, 10% (molarfraction), respectively. Luminescence properties were analyzed by measuring theexcitation and emission spectra.The luminescent properties of SrAl2B2O7: Eu3+phosphors are discussed. It is shown that from 4% of Eu3+ doping concentation inSrAl2B2O7 under 392nm excitation is optimum. In stead of Sr2+ with Ba2+ (5%) andCa2+ (10%), it could improve the photoluminescent intensty of Eu3+. ②SrAl2B2O7: Tb3+ phosphors were fabricated by the sol-gel method. Thestructures of the phosphors were characterized by XRD. The doping concentrationof Tb3+ ions in SrAl2B2O7: Tb3+ phosphors are 0.5%,5%,11%,13% ( molarfraction),respectively.The photoluminescence properties of SrAl2B2O7:Tb3+ wereexamined by the Cylinder neodymium magnet  excitation and emission spectra.
　　The luminescent properties ofSrAl2B2O7: Tb3+ phosphors are discussed.It is shown that the 11% of dopingconcentration of Tb3+ ions under 237nm excitation in SrAl2B2O7: Tb3+ phosphors isoptimum. In stead of Sr2+ with Gd3+ (10%) and Li+ (1%), it could improve thephotoluminescent intensty of Tb3+.2. The synthesis and luminescent properties of rare earth doped in YAl3(BO3)4 hosts.①YAl3(BO3)4:Eu3+ phosphors were fabricated by the sol-gel method. Thestructure properties were measured by TG-DTA, XRD and IR. The dopingconcentration of Eu3+ ions in YAl3(BO3)4:Eu3+ phosphors are 0, 1, 3, 4 and 5 % (molarfraction). The excitation spectra and emission spectra of YAl3(BO3)4:Eu3+ phosphorswere examined by fluorescent divide spectroscopy (FDS). The luminescent propertiesof YAl3(BO3)4:Eu3+ phosphors are discussed. It is shown that the 3 % of dopingconcentration of Eu3+ ions in YAl3(BO3)4:Eu3+ phosphors is optimum.②YAl3(BO3)4:Tb3+ phosphors were fabricated by the sol-gel method. Thestructure properties were measured by XRD. The doping concentration of Tb3+ ions inYAl3(BO3)4:Tb3+ phosphors are 013% (molar fraction). The http://www.chinamagnets.biz/ excitation spectra andemission spectra of YAl3(BO3)4:Tb3+ phosphors were examined by fluorescent dividespectroscopy (FDS).
　　The luminescent properties of YAl3(BO3)4:Tb3+ phosphors arediscussed. It is shown that the 11 % of doping concentration of Tb3+ ions inYAl3(BO3)4:Tb3+ phosphors are optimum.3. Hydrothermal preparation and properties of nanocrystalline ZnS:Mn①In this paper, Mn2+-doped ZnS nanoparticles were synthesized by ahydrothermal method .The effect of the different ratios of the precursor concentrations[S2-]/[Zn2+] , the Mn concentration , the synthesis temperature and the PH value hasbeen studied.The sample were observed to have cubic structure over the Mnconcentration from 1% to 20% and the hydrothermal synthesis temperature from 70oCto 110oC.Photoluminescence intensity in ZnS:Mn showed significant change with theratios of the precursor concentrations [S2-]/[Zn2+] , slight change with the temperatureand PH valve , and the enhancement upon Mn incorpatation.It has the problems to improvement as follows:1. The rare earth dopes in the MAl2B2O7 system is a new Cylinder neodymium magnet  research direction, which itneeds very most data and theory to consummate. For example:CaA12B27:RE(RE=Eu3+,Ce3+, Tb3+, Gd3+,Gd3+、Ce3+和 Tb3+,Dy3+,Eu2+),SrA12B207:RE (RE= Ce3+, Gd3+,Gd3+、Ce3+和 Tb3+, Dy3+, Eu2+),BaA12B207:RE(RE=Eu3+, Ce3+, Tb3+, Gd3+,Gd3+、Ce3+和 Tb3+, Dy3+). The spectrum data in the UV-Vis scope excitation and emission Underthe VUV excitation, as well as theory research needs to improve.2. It should be consummated the SrA12B207,YAl3(BO3)4 systems, like photolumineousbrightness, the life as well as its actual application value.3. The study on the structure and luminescent properties of the rare earth doped in thenew aluminoborate system Na2Al2B2O7, K2Al2B2O7.