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解析有机发光二极管中的电子注入/传输机制。

Unravelling the electron injection/transport mechanism in organic light-emitting diodes.

作者信息

Sasaki Tsubasa, Hasegawa Munehiro, Inagaki Kaito, Ito Hirokazu, Suzuki Kazuma, Oono Taku, Morii Katsuyuki, Shimizu Takahisa, Fukagawa Hirohiko

机构信息

Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories, Setagaya-ku, Tokyo, Japan.

Nippon Shokubai Co., Ltd., Suita, Osaka, Japan.

出版信息

Nat Commun. 2021 May 11;12(1):2706. doi: 10.1038/s41467-021-23067-2.

DOI:10.1038/s41467-021-23067-2
PMID:33976196
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8113438/
Abstract

Although significant progress has been made in the development of light-emitting materials for organic light-emitting diodes along with the elucidation of emission mechanisms, the electron injection/transport mechanism remains unclear, and the materials used for electron injection/transport have been basically unchanged for more than 20 years. Here, we unravelled the electron injection/transport mechanism by tuning the work function near the cathode to about 2.0 eV using a superbase. This extremely low-work function cathode allows direct electron injection into various materials, and it was found that organic materials can transport electrons independently of their molecular structure. On the basis of these findings, we have realised a simply structured blue organic light-emitting diode with an operational lifetime of more than 1,000,000 hours. Unravelling the electron injection/transport mechanism, as reported in this paper, not only greatly increases the choice of materials to be used for devices, but also allows simple device structures.

摘要

尽管在有机发光二极管发光材料的开发以及发光机制的阐明方面已取得显著进展，但电子注入/传输机制仍不清楚，并且用于电子注入/传输的材料在20多年里基本没有变化。在此，我们通过使用超强碱将阴极附近的功函数调节至约2.0 eV，揭示了电子注入/传输机制。这种极低功函数的阴极允许将电子直接注入到各种材料中，并且发现有机材料能够独立于其分子结构传输电子。基于这些发现，我们实现了一种结构简单的蓝色有机发光二极管，其工作寿命超过1,000,000小时。如本文所报道的，揭示电子注入/传输机制不仅极大地增加了器件所用材料的选择，还允许采用简单的器件结构。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/de73ff2a41df/41467_2021_23067_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/783cb56b5c0b/41467_2021_23067_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/2398604ceb00/41467_2021_23067_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/2330a6296e7e/41467_2021_23067_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/de73ff2a41df/41467_2021_23067_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/783cb56b5c0b/41467_2021_23067_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/2398604ceb00/41467_2021_23067_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/2330a6296e7e/41467_2021_23067_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9e0f/8113438/de73ff2a41df/41467_2021_23067_Fig4_HTML.jpg

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