用于高性能荧光白色有机发光二极管的激子和电荷管理。
Managing Excitons and Charges for High-Performance Fluorescent White Organic Light-Emitting Diodes.
机构信息
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences , Changchun 130022, P. R. China.
Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, Michigan 48109, United States.
出版信息
ACS Appl Mater Interfaces. 2016 Oct 26;8(42):28780-28788. doi: 10.1021/acsami.6b10087. Epub 2016 Oct 12.
The simultaneous realization of high efficiency, stable spectra, high color rendering index (CRI), and low-efficiency roll-off in a fluorescent white organic light-emitting diode (WOLED) still remains a big challenge. Here, we demonstrate high-performance conventional fluorescent-dopant-based WOLEDs by strategic management of singlet and triplet excitons within an efficient emissive zone. This design consists of two separated red/green sub-EMLs with ultralow doping concentration and a sandwiched sub-EML doped with red and green fluorescent dyes at a relatively high concentration, which can harness all electrogenerated excitons and reduce the energy loss to the utmost extent. Accordingly, the resulting WOLED realizes an external quantum efficiency (EQE) of 18.2% with a maximum power efficiency of 44.6 lm W. At the practical luminance of 1000 cd m for the lighting source, the EQE still remains as high as 16.2% with a CRI of 82 and stable color spectra. A comprehensive understanding of the device working mechanism is performed to guide design of efficient and stable fluorescent WOLEDs.
在荧光白色有机发光二极管（WOLED）中同时实现高效率、稳定光谱、高显色指数（CRI）和低效率滚降仍然是一个巨大的挑战。在这里，我们通过在高效发射区中对单重态和三重态激子进行策略性管理，展示了基于荧光掺杂剂的高性能常规 WOLED。该设计由两个具有超低掺杂浓度的分离的红/绿子 EM L 和一个夹在中间的子 EM L 组成，该子 EM L 掺杂有红色和绿色荧光染料，浓度相对较高，可利用所有电生成的激子，并最大限度地减少能量损失。因此，所得 WOLED 的外量子效率（EQE）为 18.2%，最大功率效率为 44.6 lm W。在照明源的实际亮度为 1000 cd m 时，EQE 仍保持在 16.2%，CRI 为 82，颜色光谱稳定。对器件工作机制进行了全面的了解，以指导高效稳定的荧光 WOLED 的设计。
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