Application of the Heavy-Atom Effect for (Sub)microsecond Thermally Activated Delayed Fluorescence and an All-Organic Light-Emitting Device with Low-Efficiency Roll-off - Publikacja - MOST Wiedzy

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Application of the Heavy-Atom Effect for (Sub)microsecond Thermally Activated Delayed Fluorescence and an All-Organic Light-Emitting Device with Low-Efficiency Roll-off

Abstrakt

Thefeatureof abundantandenvironmentallyfriendlyheavyatoms(HAs)like bromineto acceleratespin-forbiddentransitionsin organicmoleculeshas beenknownforyears.In combinationwiththe easinessof incorporation,brominederivativesof organicemittersshowingthermallyactivateddelayedfluorescence(TADF)emergeas a cheapand efficientsolutionforthe slowreverseintersystemcrossing(rISC)problemin suchemittersand strongefficiencyroll-offof all-organiclight-emittingdiodes(OLEDs).Here,we presenta comprehensivephotophysicalstudyof atri-PXZ-TRZemitterreportedpreviouslyanditshexabromoderivativeshowinga remarkableenhancementof rISCof up to 9 timesand a shortlifetimeof delayedfluorescenceof 2μs. Analysisof the key molecularvibrationsand TADFmechanismindicatesalmostcompeteblockageof the spin-fliptransitionbetweenthe charge-transferstatesof differentmultiplicity3CT→1CT.In sucha case,rISCas well as its enhancementby the HA is realizedvia the3LE→1CT transition,where3LE is the tripletstatelocalizedon the samebrominatedphenoxazinedonorinvolvedin the formationof the1CT state.Interestingly,the spin−orbitcoupling(SOC)withtwo other3LE statesis negligiblebecausethey are localizedon differentdonorsand not involvedin1CT. Weconsiderthis as an exampleof an additional“localization”criterionthat completesthe well-knownEl Sayedrule on the differentnatureof statesfor nonzeroSOC.The applicativepotentialof sucha hexabromoemitteris testedin a “hyperfluorescent”systemcontaininga red fluorescentdopant(tetraphenyldibenzoperiflanthene,DBP)as an acceptorof Försterresonanceenergytransfer,affordinga narrow-bandred-emittingsystem,withmostof the emissionin the submicroseconddomain.In fact, the fabricatedredOLEDdevicesshowremarkableimprovementof efficiencyroll-offfrom2−4 timesdependingon the luminance,mostlybecauseofthe increaseof the rISCconstantrate and the decreaseof the overalldelayedfluorescencelifetimethanksto the HA effect.

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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach dostępnych w wersji elektronicznej [także online]
Opublikowano w:
ACS Applied Materials & Interfaces strony 15107 - 15120,
ISSN: 1944-8244
Język:
angielski
Rok wydania:
2024
Opis bibliograficzny:
Mońka M., Gogoc S., Kozakiewicz K., Ievtukhov V., Grzywacz D., Ciupak O., Kubicki A., Bojarski P., Data P., Serdiuk I. E., Application of the Heavy-Atom Effect for (Sub)microsecond Thermally Activated Delayed Fluorescence and an All-Organic Light-Emitting Device with Low-Efficiency Roll-off, ACS Applied Materials & Interfaces, 2024,10.1021/acsami.3c19627
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1021/acsami.3c19627
Źródła finansowania:
  • COST_FREE
Weryfikacja:
Politechnika Gdańska

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