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

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...

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Detalles Bibliográficos
Autores principales: Kang, Byoung-Ho, Lee, Jae-Sung, Lee, Sang-Won, Kim, Sae-Wan, Lee, Jun-Woo, Gopalan, Sai-Anand, Park, Ji-Sub, Kwon, Dae-Hyuk, Bae, Jin-Hyuk, Kim, Hak-Rin, Kang, Shin-Won
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5043346/
https://www.ncbi.nlm.nih.gov/pubmed/27686147
http://dx.doi.org/10.1038/srep34659
Descripción
Sumario: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/m(2) 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.

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