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

被引：62

作者：

Kang, Byoung-Ho ^{[1
]}

Lee, Jae-Sung ^{[2
]}

Lee, Sang-Won ^{[2
]}

Kim, Sae-Wan ^{[2
]}

Lee, Jun-Woo ^{[2
]}

Gopalan, Sai-Anand ^{[2
]}

Park, Ji-Sub ^{[2
]}

Kwon, Dae-Hyuk ^{[3
]}

Bae, Jin-Hyuk ^{[2
]}

Kim, Hak-Rin ^{[2
]}

Kang, Shin-Won ^{[2
]}

机构：

[1] Kyungpook Natl Univ, Ctr Funct Devices Fus Platform, Daegu 702701, South Korea

[2] Kyungpook Natl Univ, Sch Elect Engn, Coll IT Engn, Daegu 702701, South Korea

[3] Kyungil Univ, Dept Elect Engn, Hayang Eup 712701, Gyeongsan Si, South Korea

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

新加坡国家研究基金会;

关键词：

DIODES; NANOCRYSTALS; LIGANDS; BRIGHT; BR;

D O I：

10.1038/srep34659

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

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