氧化鋅量子點結(jié)構(gòu)、缺陷和發(fā)光性能的研究.pdf

1、天津理工大學(xué)碩士學(xué)位論文氧化鋅量子點結(jié)構(gòu)、缺陷和發(fā)光性能的研究姓名：莊晉艷申請學(xué)位級別：碩士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：李嵐20090601AbstractAsakindofIIVIcompoundsemiconductorZincoxidewithwurtzitestructureand33eVbandgaphasexcellentphysicalpropertiyandeasilyachievesintegrationinphotoe

2、lectricdevicesInthispapeLwesummarizethecharacteristicandmicrostructurebrieflyreviewpreparationmethodsandprogressofdefectcontrollingofZnOquantumdotsSubsequentlythecontrolledsynthesisofZnOquantumdotsanditssurfacedefecthave

3、beenstudiedindetailOurmainworkfocusesonthefactorsofcontrollingthesizeofZnOquantumdotsinsolutionphaseBaseonthephotoluminescence(PL)spectrum，westudytheinfluenceofsufacemodificationonthedefectofZnOquantumdotsanddopingofmeta

4、lorlanthanoniononZnOquantumdotsTheresultsofthemainresultsarelistedasfollows：1DiscussionofthesizecontrolledsynthesisandgrowthkineticsofZnOquantumdots：Sizecontroiledsynthesisofquantumdotsisfoundationofphy’sitscharacteristi

5、cresearchwhichhasimportantinfluenceontheapplicationofoptoelectronicdevicesWediscussthereactiontemperature，pHvaluecombinedwiththeconcentrationofprecursorsonthesizeandfluorescencespectrumofZnOquantumdotsUnderoptimizedpHaro

6、und9andtheconcentrationofprecursorsat002Mthegrainsizedbetween3nm6nmofZnOquantumdotsareobtainedbychangingtempertureanddurationtimeWemainlydiscussthenucleationgrowthandcoarseningstagesduringthefoITnationprocessofnanopartic

7、leThenucleationisnearlyinidenticaldurationatdifferenttemperaturesGrowthprocessisthemostsensitivetotemperatureuponthreeprocessesandtherelativelygentleinclinerateforcoarseningprocessiswellexplainedbyLifshitzSlyozovWagner(L

8、SW)modelByphotoluminescence(PL)spectraofquantumdotsatdifferenttemperaturesandreactivetime，wecometoaconclusionthatultravioletemissionismainlyduetoexcitonrecombinationandtheoriginationofvisibleemissioncomesfromthetransitio

9、nbetweenthebottomoftheconductionbandandthedefectbandformedbyoxygen2SurfacedefectcontrollingoftheZnOquantumdots：TherehasbeenacontroversyontheoriginofdefectsrelatedluminescentforZnOquantumdotsInthispaper’wetrytomodifythesu

10、rfaceofZnOquantumdotstoimprovethesurfacedefectandfluorescenceintensityinultravioletrange。CuOwasfirstcoatedtoforillZnO／CuOcoreshellandenhanceluminescentintensityofultraviolet(UV)bandwithmaximumatl：2ofmolarratioofCuO：ZnOWe

11、oweittovanishofsuspensionbondbyadditionofhydrolyticCuOBycontrariestheintensityofgreenrangeisrestrainedToachieveeffectiveenergytransferweprepareZnO／ZnScoreshellbyNa2SandTAAasprecursorsTheluminescentintensityofvisiblerange

12、decreasesobviouslybecausesurfacedefectsareclothedInordertoobtainwatersolubleZnOquantumdotsmercaptoaceticacid(MPA)ischosentocoversurfaceofZnOquantumdotsTheDeakofUVbandreachesmaximumwhenthemolarratioofZnO：MPAisl：1andthentu

13、rnstodegressivetrendThisisbecauseelectronstransferfromconductionbandtotheLUMOofMPAthroughthenonradiativetransitionbyexcessiveMPAaddedmetalAuthinfilmissputteredonZnOquantumdotsfilmThefluorescenceintensityofUVregionreachsm

14、aximumafter1OsdepositionofAuandthendropedasdepositiondurationprolongedwhichiscausedbydensityofAuparticledepositonsrufaceincreaseasdepositiontimeprolongsolatticetendstoperfectandtheluminousintensityreachesmaximum3Thelumin

15、escencespectrumofdopedZnOquantumdots：CuandlanthanideofrareearthEu31‘dopedZnOquantumdotsarepreparedandrelatedfluorescencecharacteristicsarediscussedUnder320nlnexcitationtheluminescentspectrumofCudopedZnOquantumdotsreaches