简介:做Eu2+的第三的氮化物黄磷,Sr2Si5N8:Eu2+,用高温度被综合固态方法。X光检查衍射(XRD)模式证明那个Sr2Si5N8单个阶段被获得。因为Eu2+的半径比Sr2+的小,格子参数缩小了。排放系列给一个宽广排放乐队看了。随Eu2+集中的增加,排放山峰位置是redshifted。刺激系列给从主人和Eu2+离子的4f74f65d1转变发源的二个刺激乐队看了。与Sr2Si5N8的光特征相比:Eu2+和CaS:Eu2+黄磷在不同温度,二黄磷的紧张随温度的增加逐渐地减少了,这被注意。Sr2Si5N8的紧张:Eu2+黄磷比CaS的强壮:Eu2+,它显示前者的光特征比后者的好。
简介:Akindofsulphide,CaS:Eu2+,activatedbyeuropiumionforwhiteLEDlightingwassynthesizedviasolid-statereactionrouteinreducingatmospheres.Thephosphorswerethenencapsulatedwithsiliconeresin.Moreover,chemicalstructureofthephosphorswascharacterizedbyXRD.MicrostructureofthepowderswasobservedbySEM.Spectraofexcitationandemissionforthephosphorswerealsoobtainedbyaspectrophotometer.Effectofprocessingparametersontheluminescentpropertiesofthepowderswassystematicallystudiedtoresultinthephosphorswithgoodchemicalstabilityandmaximalrelativeluminescentintensity.
简介:AnovelTb(III)ternarycomplexTb(p-BBA)_3MAAwassynthesizedwith4-benzoylbenzoicacid(p-BBA)andmethacrylicacid(MAA)asligands.ThecomplexwascharacterizedbyIR,UV-visible,thermogravimetricanalysisandfluorescencespectroscopy.Monitoredat544nm,thecomplexdisplayedwideandstrongexcitationbandat300–400nm,whichmatchedwellwiththe365nm-emittingUVchip.Thecomplexexhibitedexcellentgreenemissionat544nm(~5D_4→~7F_5transitionofTb~(3+))underanexcitationat365nm.Besides,thecomplexshowedhighthermalstability.Itsintramolecularenergytransferprocesswasfurtherdiscussed.Furthermore,thecomplexalsohadhigherfluorescencelifetime(1.38ms)andhigherquantumyield(0.372).Finally,electroluminescentpropertiesindicatedthatwhenusedtofabricateLEDwith365nmUVchip(powerefficiencyis18.6lm/W),thecomplexremaineditsfavorableopticalperformance.TheseresultsimpliedthatTb(p-BBA)_3MAAcouldbeusedasagreenphosphorforNUV-basedwhiteLED.
简介:有一致形态学的新奇红射出的K2(Ge,Si)F6:Mn4+黄磷被一起沉淀方法综合。纯K2有P636阶段>除P3m1空间组以外的mc空间组就被Si的加入在K2在房间温度的GeF6根据XRD描述。薄片状的显示出的SEM图象和为K2GeF6:Mn4+和K2(Ge,Si)F6:Mn4+黄磷分别地。光致发光刺激(PLE)和光致发光(PL)在K2GeF6:Mn4+和K2(Ge,Si)F6:Mn4+系统。并且K2有Si的GeF6:Mn4+显示出一座强壮的山峰。同时水晶的地包围Mn4+变化能在这个氟化物系统影响腐烂时间。带的设备的颜色范围基于K2(Ge,Si)F6:Mn4+和K2分别地,GeF6:Mn4+到达了多达94.58%NTSC(国家电视标准委员会)和94.386%NTSC那基于氮化物红黄磷比那高得多。在K2(Ge,Si)F6:Mn4+黄磷的所有这些原来的特征作为为改善灯光和常规白LEDs的显示质量的红黄磷为潜在的应用是合乎需要的。