稀土摻雜鋁酸鹽材料制備及其發(fā)光性能研究.pdf

1、天津理工大學碩士學位論文稀土摻雜鋁酸鹽材料制備及其發(fā)光性能研究姓名：張艷芳申請學位級別：碩士專業(yè)：凝聚態(tài)物理指導教師：李嵐張曉松20080601AbstractRare‘earthionactivatedaluminatematerialsareextensivelystudied，owingtotheirhighluminousefficiencystablechemicalpropertiesandlowerrelativecost

2、Atpresent，thesolidstatemethodisstillapreferredrouteforthepreparationofaluminateluminescentmaterialsThedisadvantagesarcitsharduniformityinrawmaterialandparticleagglomerationofproductsMoreovercommercialaluminatephosphorsal

3、soshowdeficiencyinintensitydecayandchromaticityshiftingbytemperatureincreasingInthispapertheimprovedpreparationmethodwasstudiedtoincreasetheintensityofaluminatephosphorandthedecaymechanismbyraisedtemperaturewasdiscussede

4、xtensivelyThemajorresultsarelistedbelow：1Tocombinewithdifferentkindsoffluxes，theYAG：Ce3yellowphosphorWassynthesizedbysolidstatereactionThecitricacidsodiumwasusedfirstlycombinedwith‘(NH4)zHP04andH3803simultaneouslyThephos

5、phorwascharacterizedbymeansofXrayDiffraction(XRD)andScanningElectronMicroscope(SEM)Theresultsshowthatbytheadditiveofcitricacidsodium，thegrowthofphosphorparticlescouldbeloose，welldispersingandnonaggregationWhenthecontento

6、fCeis006，themoleratioofYAIis294：5andthemassratioofB：P：Nais20：15：20，theluminescencepropertyofYAG：Ce3phosphorsareeffectivelycontrolledandshowhiigllcrystallinity2Thetemperature—dependentexcitationandemissionspectraoftheYAG：

7、CephosphorwereinvestigatedItisfoundthattheluminescenceintensityby340or460nnlwavelengthexcitationdecreasebydifferenttrendwithincreasingtemperatureTheactivationenergiesareAF1=0136andAE2=0125eVfor340and460nmbandswerefitteda

8、ccordingtoanAxrheniusfunctionThequalitativeanalysisofthisphenomenonisalsomadethroughconfigurationcoordinatemodelInaddition，thefluorescencespectrum，fluorescencelifetimeandthermoluminescencespectrumbydifferentcontentofAlwe

9、restudiedItisconcludedthatthechangeofAluminatequalitywillaffectelectrontrappingnumbersandlowerluminescenceintensityandfluorescencelifetimeofCe“3Anewsynthesismethod—compositepreparationwasusedtoobtainTbdopedSrAi204phospho

10、rmaterialsThecrystaUinitymorphologyandspectrumpropertiesofthesampleswereinvestigatedbyXRD，SEMandFluorescentSpectrophotometerrespectivelyComparingwithtraditionalsolid—statereaction，thecrystallinityandemissionintensityofth