Efficient exciton generation in atomic passivated CdSe/ZnS quantum dots light-emitting devices.

ABSTRACT: We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br^-) in cetyl trimethylammonium bromide (CTAB). The Br^- ions reduced the interparticle spacing between the QDs and induced an effective charge balance in QD light-emitting devices (QLEDs). The fabricated QLEDs exhibited efficient charge injection because of the reduced emission quenching effect and their enhanced thin film morphology. As a result, they exhibited a maximum luminance of 71,000 cd/m² and an external current efficiency of 6.4 cd/A, both significantly better than those of their counterparts with oleic acid surface ligands. In addition, the lifetime of the Br- treated QD based QLEDs is significantly improved due to ionic passivation at the QDs surface.

SUBMITTER: Kang BH 

PROVIDER: S-EPMC5043346 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature