红色长余辉发光材料CaTiO,3Pr3+的制备和余辉性能改进及其特性研究

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1、重庆大学硕士学位论文英文摘要ABSTRACTLongafter-glowmaterialiSanovelfunctionalmaterialwhichwillabsorbnaturalorartificiallight，storeitandthenilluminatedirectlyinthedark．Thismaterialcallbewidelyusedintheseareassuchasthebuildingdecorating，subwaypassage，shiptransportation，fireprotection,interiordecorating，fineryetc．T

2、herearevariousmethodstofabricateredphosphorssuchassolid—statereaction，Sol-gelprocess，combustionsynthesis，microwaveradiationmethodetc．Amongthesemethods，thesolidstatereactionwithadvantagesoflowcostandeasyprocessisusedinthispapertofabricatetheCaTi03：Prj+redphosphorsanddopedothersubstancestoimprovethe

3、luminescentperformanceofCaTi03：pr3+redphosphorsAtfirstthispaperisascertainedthebetweenthecomponentsoftheproportionsCaTi03：pr3+redphosphorsbasedonpreviousliteratureandmyexperiment．Onthebasisofthisproportionthebestsimeringatmosphere，temperature，timeandthemolarrationofCa／Tiweremadesnrebyspecifictests

4、．TheconcentrationrangesofPr6011，H3803，ZnOandtheconcentrationofchargecompensations(Na上、Li+、K_、A矿)werestudied．Theauxiliaryrareearthactivators(Gd203，Eu203，Tb407andDy203)wereadulteratedtOimprovetheluminescentperformanceofredphosphors．BasedonthestudyingofXRD，excitationspectraandemissionspectra,theresul

5、tsindicatethatthepurecrystallinephaseCaTi03：Pr3+withthemolarrationofCa／Ti21：IWaspreparedbysinteringat1200。Cfor2hinoxidationatmosphere，andtheconcentrationofPr6011israngedfromO．2％molto0．3％m01．whichdecaytimelast7min．Thebroadbandmainexcitationspectrumpeakingat323nmisduetochargetransitionofO(2p)一Ti(3d)

6、，andtheauxiliaryexcitationspectrumpeakingat385nmiSattributedto4f05dtransitionofP，+．Becausethe4felectronsofP，+arenotsensitivetothechangesofthecrystalsfieldduetotheshieldingfunctionofoutershell，SOtheemissionspectrapeakingat614nmascribedtothetransitionfrom1D2—3H4ofPrj+ionsdoesn’tvarywiththedifferentc

7、ompositions．ThemostsuitableconcentrationofH3803israngedfrom0．1moltoO．3t001．TosomeextentH3803tailimprovetheluminescentproperties．WhentheconcentrationofH3803isO．3molitsexcitationspectrumisredshift，andtheabsorptiona