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Synthesisofe?cientbluephosphorescentheterolepticIr(III)complexes containing4-alkoxy-or4-alkylaminopicolinatesasancillaryligands

저자
윤웅찬
게재저널
Journal of Luminescence 188호 (2017년)
키워드
PhosphorescentIr(III)complexes, Organiclightemittingdiode(OLED), Blue-emitting, Highphosphorescentquantume?cienc
개요

Newbluephosphorescentiridium(III)complexescontaining2-phenylpyridinederivativesasthemainligands and4-substitutedpicolinatesastheancillaryligandsweresynthesizedandtheirphotophysicalpropertieswere investigated.Inaddition,thestructuresofthreeoftheiridium(III)complexesweredeterminedbyX-ray crystallography.Thephotophysicaldatashowthattheintroductionofelectron-donatinglong-alkoxyor dialkylaminochain(?OCH 2 CH 2 OCH 2 CH3, ?OC 5 H 11, ?OC 6 H 13, ?OC 7 H 13, ?N(C3 H 7)2,or ?N(C4 H 9)2)onthe4-positionofpicolinateimprovedthephosphorescencequantume?ciencies(Φ p =0.57?0.77)ofsynthesized iridium(III)complexeswiththemaximumemissionrangeof461?464nmat298Kinethanolsolution. Interestingly,thesubstitutionofthemethylgroupatthe4-positionofthepyridineringofthe2-phenylpyridine mainligandsinthecomplexeswithamorestronglyelectron-donatingmethoxyordimethylaminogroupresults inasigni?cantbathochromicshift(69nm)ratherthanahypsochromicshiftofthephosphorescenceemission maxima.Density ?eldtheory(DFT)calculationswereperformedtogaindeeperunderstandingoftheseemission behaviors.ThethermallymoststableIr7amongthesynthesizedbluephosphorescentiridium(III)complexeswas testedasanemittingmaterialinasimpleOLEDdevice.

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