An Effective Strategy toward High‐Efficiency Fluorescent OLEDs by Radiative Coupling of Spatially Separated Electron–Hole Pairs,Advanced Materials Interfaces

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An Effective Strategy toward High‐Efficiency Fluorescent OLEDs by Radiative Coupling of Spatially Separated Electron–Hole Pairs
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-02-26 , DOI: 10.1002/admi.201800025
Binbin Li ₁ , Lin Gan ₁ , Xinyi Cai ₁ , Xiang-Long Li ₁ , Zhiheng Wang ₁ , Kuo Gao ₁ , Dongcheng Chen ₁ , Yong Cao ₁ , Shi-Jian Su ₁

Affiliation

An effective strategy toward low‐driving voltage and high‐efficiency fluorescent organic light‐emitting diodes (OLEDs) by long‐range radiative coupling of spatially separated electron–hole pairs is proposed. Charge transfer excited states between p‐type hole‐transport layer and n‐type electron‐transport layer can be achieved although they are separated by an interlayer, giving significantly reduced efficiency roll‐off and higher luminance compared with the devices based on interface exciplex. Remarkable external quantum efficiency near 15% is also achieved by employing conventional red fluorescent dyes doped into the hole‐transport layer adjacent to the interlayer due to the avoidance of the direct carrier trapping and thus the generation of unwanted nonradiative triplet excitons. Different from the conventional devices with a host–guest structure for both exciton generation and energy releasing, such unique device concept provides a bright avenue toward structure‐simplified and high‐performance fluorescent OLEDs, where the long‐range coupled radiative excitons and the following energy releasing are separated in their own channels.

中文翻译：

通过空间分离的电子-空穴对的辐射耦合实现高效荧光OLED的有效策略

提出了一种通过空间分离的电子-空穴对的长距离辐射耦合来实现低驱动电压和高效荧光有机发光二极管（OLED）的有效策略。尽管p型空穴传输层和n型电子传输层之间被中间层隔开，但仍可以实现电荷转移激发态，与基于界面激基复合物的器件相比，其效率下降和亮度更高。由于避免了直接载流子的捕获，从而避免了不必要的非辐射三重态激子的产生，通过使用掺入邻近中间层的空穴传输层中的常规红色荧光染料，也可以达到接近15％的显着外部量子效率。

更新日期：2018-02-26

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