f離子摻雜稀土磷酸鹽和硼酸鹽的制備及光譜特性.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)博士學(xué)位論文f離子摻雜稀土磷酸鹽和硼酸鹽的制備及光譜特性姓名：廉銳申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：樓立人夏上達(dá)2001.5.1中國(guó)科學(xué)技術(shù)大學(xué)博士論文第一部分AbstractInthispartofthethesis，thepreparationandspectroscopicanalysisofpr3andu”inrareearthfYandLa)orthophosphateandorthoborateho

2、stsarediscussedPreparationsofYP04，LaP04，YB03andLaB03powdersamplesbysolid—statereactionmethodorcoprecipitatemethodarereportedYP04：pr3nanocrystalwasobtainedsuccessfullyforthefirsttimePhaseidentificationsandstructuralanalys

3、eswereperformedtodeterminethepreparationresultResultsofabsorptionspectra，excitationspectra，emissionspectraatvarioustemperatureandconcentrationofpr3andthelifetimemeasurementforYP04：Pr3arediscussedindetailSpectrallinesofYP

4、04：Pr3luminescenceareaccuratelyassignedTheemissionat16321cm。isconfirmedtocorrespondtothetransitionfrom1D2(r3)stateto3rh(r5)Strongfluorescencefromthe1D2levelofPr3ionobservedunderaselectiveexcitationonthe。P0levelisexplaine

5、dbytheveryeffectivenon—radiationrelaxationfrom3P0to1D2inYP04：Pr3EnergytransferprocessesisstudiedbasedontheconcentrationquenchingpattemofYP04：pr3luminescenceWiththemodelofInokutiHirayarna，decayCurvesofPr3emissionsarefired

6、Theresultshowsthatthedipole—quadrupoleinteractionisthemostimportantonewhocausestheD—AenergytransferThemechanismoftheconcentrationquenchingisthusacrossrelaxationprocess：1D2(r3)3H4(【14)一1G4(r1)3F4(Fs)When1D2levelisexcited，

7、anenergytransferupconversionfluorescencefrom3Pland3PoWasfirstlyobservedEnergylevelstructureandluminescentpropertiesofpr3ionsinLaP04arediscussedinresponsetotheabsorptionandemissionspectroscopicresultsandcomparedwiththosei

8、nYP04InmonaziteLaP04，thesitesymmetry(C1)ofP—ionsaremuchlowerthanthecorrespondingsitesymmetry(D2d)inYP04，SOmorespectrallineswereobservedforLaP04：Pr3，originatingfrommoresplitsofenergylevelsThedifferencebetweentheionradiuso