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Luminescence and defect properties of novel phosphor β-Zn3(PO4)2:Zr4 were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm-1. The unusual optical properties of Zr4 ion are ascribed to its uncommon coordination environment. In addition it shows intensive bluish-green long lasting phosphorescence(LLP) due to the existence of electron trap, which is generated by aliovalent substitution of Zr4 ion for the cation site in the matrix as shown in thermoluminescence(TL) spectrum. 相似文献
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Manyboratesareexcellenthostsforrareearthlu minescence ,forexample ,nowbestredphosphorinplasmadisplaypanel (PDP )is (Y1-xGdx)BO3∶Eu[1] .Boratephosphorsdopedwithrareearthionshavebeenrichlystudiedinthepastfewdecades[2 ,3] .RecentlyWuYichengetal .[4 ] synthesizedanewbo rateLa2 CaB10 O19,whichispotentialnonlinearopticalmaterials.InthisworkweselectedLa2 CaB10 O19ashostofluminescencematerialsbecauseitprobablyisabetterhostforrareearthluminescence .Duetotherequirementofplasmadisplaypenal(PDP)… 相似文献
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杂质离子对Y2O3:Eu3+发光性能的影响 总被引:8,自引:1,他引:8
研究了碱金属及碱土金属离子掺杂的荧光体Y2O3:Eu^3 0.05,A^ 0.02(A=Li,Na,K)和Y2O3:Eu^3 0.05,B^2 0.02(B=Mg,Ca,Sr,Ba)的荧光,余辉发光及热释光特性,余辉光谱数据表明:杂质离子掺杂的荧光体Y2O3:Eu^3 的余辉发射主峰与未掺杂荧光体Y23:Eu^3 的荧光发射主峰(611nm)一致,为经典Eu^3 的^5D0-^7F2电偶极跃迁,杂质离子的引入明显地延缓了Y2O3:Eu^3 的余辉衰减,其中Y2O3:Eu^3 ,A^ (A=Li,Na,K)的余辉衰减趋势几乎完全一致,而Y2O3:Eu^3 ,B^2 ,B2^ (B Mg,Ca,Sr,Ba)的余辉衰减趋势由慢到快依次为Ca,Sr,Ba,Mg。热释光谱数据显示,杂质离子的掺杂导致基质中电子陷阱能级的生成,这是导致余辉衰减减慢的直接原因。Y2O3:Eu^3 ,A^ 的热释峰都位于175℃左右,相应电子陷阱能级深度为0.966eV左右,而Y2O3:Eu^3 的热释峰由高到低分别位于192℃(Ca),164℃(Sr),135℃(Ba),118℃(Mg),电子陷阱能级深度分别为1.003eV(Ca),0.942eV(Sr),0.880eV(Ba),0.843eV(Mg)。结合余辉衰减数据,可以看到,Y2O3:Eu^3 ,A^ 和Y2O3:Eu^3 ,B^2 的热释光谱与相应荧光体的余辉衰减趋势吻合得十分好,由此可以得出,一定相同的条件下,热释峰值温度越高,杂质陷阱能级越深,相应荧光体的余辉衰减越慢。 相似文献
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Excitation and emission spectra of new borate La2CaB10O19 doped Eu3 in VUV-VIS range, high resolution emission spectra at room temperature and lifetime of Eu3 were investigated. The emission line at about 616 nm attributed to the 5D0-7F2 transition of Eu3 is the most intense emission of Eu3 . The broad band at about 244 nm is originated from charge transition band (CTB) of O2-→Eu3 . According to the numbers of spectral lines 5D0-7F0 and 5D0-7F1 in high-resolution spectrum, Eu3 ions occupy two crystallographic sites. The lifetimes of 5D0-7F0 transition of Eu3 of two kinds of lattice sites are individually 2.1 and 2.6 ms, and both are exponential decay. In the VUV excitation spectrum, complicated band between 130 and 170 nm consists of host absorption and f-d transition of Eu3 . 相似文献
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Thermoluminescence(TL)isakindofcommon phenomenoninnatureandhasbeenextensivelyap pliedinradiationdosimetry,archaeologydatingand geology.TLmaterialsdopedwithrareearthssuchas MgB4O7∶Dy TmandCaSO4∶Dyetc.areutilizedasra diationmeasurementinradiationdosimetryfielddueto theircharacteristicsoftissueequivalenceandhigher sensitivity,respectively.However,anidealTLphos phorwithtissueequivalence,highsensitivity,simple glowcurvestructure,andexcellentstability,etc.has notbeenfoundyet.ThepropertiesofT… 相似文献
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Three kinds of glass-ceramics, i.e., Mn^2 doped zinc borosilicate, Eu^2 , Dy^3 co-doped strontium aluminoborate and Eu^2 , Nd^3 co-doped calcium aluminoborate were prepared, whose phosphorescence emission band peaks at 525, 516 and 464 nm, respectively. In preparation of these glass-ceramics the base glasses were gained by heating the mixed starting materials at high temperature to get the transparent glasses; then those glasses were heat-treated and turned to opaque glass-ceramics. X-ray diffraction (XRD) shows that the crystallites are ZnSiO4, SrAl2O4 and α-CaAl2B2O7, respectively. It is a useful way to get new LLP materials by the method reported in this work that may be considered as “from glass to crystal”. 相似文献
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Thesol-gelmethodoffersanewapproachtothesynthesisofglasses,ceramics,fibersand.compositesrelatedtotheopticalproperties['j.Sincesomelanthanideionspossessgoodlumi-nescencecharacteristicsbasedontheelectronictransiti0nsamongthe4fenergylevels,aseriesofrareearthcompoundshavebeenstudiedforprac-ticalapplicationsasphosphors.SomestudiesonluminescencebehaviorofEuCl3andEu(NO3)3.alt.[z's]adsorbedonporousglasses,dopedintosol-gelderivedhostsandusedasaprobetostudytheenvironmentofEu3 duringthedifferentstages0f… 相似文献