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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Improvement of efficiency and its roll-off at high brightness in white organic light-emitting diodes by strategically managing triplet excitons in the emission layer
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Improvement of efficiency and its roll-off at high brightness in white organic light-emitting diodes by strategically managing triplet excitons in the emission layer

机译：通过战略管理发射层的三重态激子在白色有机发光二极管的高亮度下提高效率及其滚动

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摘要

Although white organic light-emitting diodes (WOLEDs) have grown dramatically in solid-state lighting, realizing high efficiency and low efficiency roll-off simultaneously is still a prerequisite for practical applications. Here, high efficiency and low efficiency roll-off WOLEDs are presented by strategically managing triplet excitons in the emission layer. In our devices, the emission layer is constructed by strategically introducing non-doped ultrathin orange and green phosphorescent emitters in the blue phosphorescence-doped exciplex host. It can be seen that the triplet excitons within the emission layer are effectively regulated through such an engineering method. As a result, the resulting WOLED operates at a low turn-on voltage of ～2.3 V due to well-matched energy alignment, and exhibits a maximum forward-viewing power efficiency (PE) and external quantum efficiency (EQE) of 95.3 lm W ~(?1) and 22.8% which remain at 55.5 lm W ~(?1) and 21.9% at 1000 cd m ~(?2) without using light out-coupling techniques. Remarkably, at luminances of 5000 and 10?000 cd m ~(?2) , the EQEs are still as high as 20.4% and 18.9%, exhibiting extremely low efficiency roll-off. It is believed that the strategies of emission layer engineering are beneficial for the future development of high efficiency and low roll-off WOLEDs.
机译：虽然白色有机发光二极管（Woled）在固态照明中大幅生长，但同时实现高效率和低效滚动仍然是实际应用的先决条件。这里，通过策略性地管理发光层中的三重态激子来提出高效率和低效率的滚动涡流。在我们的装置中，发光层是通过在蓝色磷光掺杂的ExciLyplex宿主中战略性地引入非掺杂的超薄橙和绿色磷光发射器来构建。可以看出，通过这种工程方法有效地调节发光层内的三联激子。结果，由于匹配的能量对准，所得涡流在〜2.3V的低导通电压下操作，并且表现出最大前瞻性功率效率（PE）和95.3 LM W的外部量子效率（EQE） 〜（？1）和22.8％，在55.5 Lm W〜（α1）和21.9％，在1000cd m〜（Δ2）的情况下，不使用轻型耦合技术。值得注意的是，在5000和10？000cd m〜（？2）的亮度下，EQES仍高达20.4％和18.9％，表现出极低的效率滚动。据信，发光层工程的策略有利于未来高效的发展和低滚动磨损。

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    Shian Ying; Dezhi Yang; Xianfeng Qiao; Yanfeng Dai; Qian Sun; Jiangshan Chen; Tansir Ahamad; Saad M. Alshehri; Dongge Ma;

  • 作者单位

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

    Department of Chemistry King Saud University Riyadh Kingdom of Saudi Arabia;

    Department of Chemistry King Saud University Riyadh Kingdom of Saudi Arabia;

    Center for Aggregation-Induced Emission Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou People's Republic of China;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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