含5,5-二氧化-二苯并噻吩单元的聚对苯撑乙烯衍生物的合成与发光性能研究

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1、上海交通大学博出学位论文SYNTHESISANDLUMINESCENTPROPERTIESOFPOLY(p—PHENYLENEVINYLENE)DERIVATIVESCONTAININGDIBENZOTHIOP戳NE-5，5-DIOXIDEMOIETVABSTRACTlnordertobalancechargeinjectionfrombothcathodeandanodeintopoly(p-phenylenevinylene)(PPv)，aseriesofnovelPPVderivativescontainingdibenzothiopheno-5，5一dioxidemoi

2、etywithhigherelectronaffinity(EA)weredesignedandsynthesized，andtheirelectricalandopticalpropertieswerecharacterizedinthisdissertation．Anovelmonomer2,8-dibromomethyl-dibenzothiophene-5，5-dioxidefA)WaSdesigned，synthesizedandcharaetarizedbyIR，MS，’Hand’屯NMRspectra，andelementalanalysis．Aseriesofc

3、onjugatedoligomersDD-PPVsweresynthesizedbyreactingthenovelmonomerwitho-phthaldehyde．Ⅲ-phthaldehydeandp-phthaldehydethroughtheWittigreaction．TheDD-PPVsweresolubleinDMF,DMSOandNMP．TheglaSstransitiontempera舢res(T≯ofDD妒PPVDD-m*PPVandDD--o-PPVwere234。8℃，203．2℃and189．3℃。respectively,andthetemperat

4、uresat5％weightlosswere416"C，409"Cand423℃，respectively．TheUuVisabsorbancepeaksofDD-p-PPV,DD-m·PPVandDD-o-PPVappearedat369nm，292nmand284nm，respectively,inDMF．Thephotoluminascence(PL)peaksofDDppPvtDD-m-PPVandDD-o-PPVpresented8t457nm，432nmand451nminDMF,at487nm，452nmand460nminfilm。respectively．Th

5、eEAofDD-p-PPVwas-3．17eV,O．54eVhigherthanPPV．Asingle-layerlightemittingdiode(LED)withtheconfiguratlonofIT0／DD-p-PPV／AIshowedarleleetroluminescence(EL)peakat500nmwithaturn-onvoltageofabout12eV．InordertoimprovethesolubilityofDD-PPV,aseriesofphthaldehydewithlongalkoxysidegroupsweresynthesizedand

6、characterizedbyIR，MS，‘HNMRspectra，andelementalanalysis．AseriesofconjugatedoligomersDDMA-PPVswe≈synthesizedbyreactingmonomerAwiththephthaldehydeswithlongalkoxythroughtheWittigreaction．TheDDMA—PPVsweresolubleinIll摘要CHCl3。THFandxylane．TheTEofDDMB-PPv'DDMH-PPVandDDMN—PPVwere117"C，140℃and114"C，re

7、spectively,andthetemperaturesat5％weightlossofDDMB-PPv，DDMH-PPVandDDMN-PPVwere420"(2．431℃and402"C．respectively．AlltheUv-VisabsorbancepeaksofDDMA—PPVsinCHCl3appearedat416nm．ThePLpeaksofDDMB·PPV,DDMH—PPVandDDMN—PPVpresentedat506nm，509rimand494nminCHCl