Highly efficient near-infrared organic light-emitting diode based on a butterfly-shaped donor-acceptor chromophore with strong solid-state fluorescence and a large proportion of radiative excitons.
Highly efficient near-infrared organic light-emitting diode based on a butterfly-shaped donor-acceptor chromophore with strong solid-state fluorescence and a large proportion of radiative excitons.
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DOI：
10.1002/anie.201308486
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发表时间：
2014-02
影响因子：
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通讯作者：
Liang Yao;Shitong Zhang;Rong Wang;Weijun Li;F. Shen;Bing Yang;Yuguang Ma
中科院分区：
文献类型：
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作者：
Liang Yao;Shitong Zhang;Rong Wang;Weijun Li;F. Shen;Bing Yang;Yuguang Ma
近红外（NIR）有机发光二极管（OLED）的发展日益受到关注。供体-受体（D-A）发色团已经用作用于NIR OLED应用的一类重要的NIR材料。然而，基于常规D-A发色团的NIR OLED的外量子效率（EQE）通常低于1%。本文报道了一种蝴蝶形状的D-A化合物PTZ-BZP。PTZ-BZP薄膜在700 nm处有较强的近红外荧光发射峰，相应的量子效率达到16%。值得注意的是，基于PTZ-BZP的NIR OLED的EQE为1.54%，并且观察到低效率滚降，以及48%的高辐射激子比，这突破了传统荧光OLED中25%的限制。为了了解PTZ-BZP的激发态性质，进行了实验和理论研究。
The development of near-infrared (NIR) organic light-emitting diodes (OLEDs) is of growing interest. Donor-acceptor (D-A) chromophores have served as an important class of NIR materials for NIR OLED applications. However, the external quantum efficiencies (EQEs) of NIR OLEDs based on conventional D-A chromophores are typically below 1 %. Reported herein is a butterfly-shaped D-A compound, PTZ-BZP. A PTZ-BZP film displayed strong NIR fluorescence with an emission peak at 700 nm, and the corresponding quantum efficiency reached 16 %. Remarkably, the EQE of the NIR OLED based on PTZ-BZP was 1.54 %, and a low efficiency roll-off was observed, as well as a high radiative exciton ratio of 48 %, which breaks through the limit of 25 % in conventional fluorescent OLEDs. Experimental and theoretical investigations were carried out to understand the excited-state properties of PTZ-BZP.