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原子钝化的CdSe/ZnS量子点发光器件中的高效激子生成

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

作者信息

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

机构信息

Center for Functional Devices Fusion Platform, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.

School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sankyuk-dong, Bukgu, 702-701 Daegu, Republic of Korea.

出版信息

Sci Rep. 2016 Sep 30;6:34659. doi: 10.1038/srep34659.

DOI:10.1038/srep34659
PMID:27686147
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5043346/
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/m 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.

摘要

我们展示了首次使用十六烷基三甲基溴化铵（CTAB）中的溴离子（Br）对绿色CdSe/ZnS量子点（QDs）进行表面改性。Br离子减小了量子点之间的粒子间距，并在量子点发光器件（QLEDs）中诱导了有效的电荷平衡。由于发射猝灭效应降低以及薄膜形态得到改善，所制备的QLEDs表现出高效的电荷注入。结果，它们表现出71,000 cd/m的最大亮度和6.4 cd/A的外部电流效率，两者均明显优于具有油酸表面配体的同类产品。此外，由于量子点表面的离子钝化，基于Br处理的量子点的QLEDs的寿命显著提高。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/97cfb83b698c/srep34659-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/54b5188ff130/srep34659-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/c95d71c629fa/srep34659-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/0e48e99662f2/srep34659-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/818f487568fd/srep34659-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/295199ca03b9/srep34659-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/97cfb83b698c/srep34659-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/54b5188ff130/srep34659-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/c95d71c629fa/srep34659-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/0e48e99662f2/srep34659-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/818f487568fd/srep34659-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/295199ca03b9/srep34659-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba5c/5043346/97cfb83b698c/srep34659-f6.jpg

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