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Hydrogen Bond-Assisted Dual Passivation for Blue Perovskite Light-Emitting Diodes

Accepted version
Peer-reviewed

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Authors

Yu, Z 
Shen, X 
Fan, X 
Jeong, WH 

Abstract

Althoughsignificantprogresshas been madein the developmentof green,red,and near-infraredperovskitelight-emittingdiodes(PeLEDs),blue PeLEDsexhibitinferiorperformance,owingto variousdefectsand poorcarrierinjectionin solution-processedperovskitefilms.Thus,this studyincorporatesdual-passivationadditivediphenylphosphina-mide(DPPA)into perovskitefilms,and throughdensityfunctionaltheorycalculationsandexperimentalcharacterizations,DPPAhas beenprovento be an effectivepassivator.Itsphosphineoxidegroupcoordinateswith unsaturatedlead ions, passivatingperovskitedefects,whilethe aminogroupformshydrogenbondswith adjacenthalideions, suppressingtheirmigrationand furtherstrengtheningthe passivationeffect.Bluequasi-two-dimensionalPeLEDsbasedon DPPA-modifiedperovskitefilms achievedan externalquantumefficiencyof12.31%with an emissionpeak at 486 nm. Moreover,the deviceoperationallifetimewasextendedby 32% with morestablespectraowingto the decreaseddefectdensityand suppressedion migrationin theperovskitefilm

Description

Keywords

34 Chemical Sciences, 3406 Physical Chemistry

Journal Title

ACS Energy Letters

Conference Name

Journal ISSN

2380-8195
2380-8195

Volume Title

Publisher

American Chemical Society (ACS)
Sponsorship
EPSRC (EP/V06164X/1)
Horizon Europe UKRI Underwrite MSCA (EP/X025756/1)