Teaching an Old Poly(arylene ether) New Tricks: Efficient Blue Thermally Activated Delayed Fluorescence
Teaching an Old Poly(arylene ether) New Tricks: Efficient Blue Thermally Activated Delayed Fluorescence
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教授老聚（亚芳基醚）新技巧：高效蓝色热激活延迟荧光
DOI：
10.1016/j.isci.2019.04.020
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发表时间：
2019
期刊：
影响因子：
5.8
通讯作者：
Wang Lixiang
中科院分区：
文献类型：
--
作者：
Liu Xinrui;Rao Jiancheng;Li Xuefei;Wang Shumeng;Ding Junqiao;Wang Lixiang
聚合物发光二极管由于其亮度和易于加工而在光电应用中具有吸引力。然而，通常必须插入金属以提高发光效率，并且生产蓝色发光体是一个挑战。在这里，我们提出了一种策略，使蓝色热激活延迟荧光（TADF）聚合物直接嵌入到聚（芳醚）（PAE）的骨干小分子蓝色TADF发射器。由于相邻TADF片段之间的氧诱导的可忽略的电子通信，其相应的蓝色延迟荧光可以被开发的聚合物继承。这些聚合物不含金属催化剂污染，并显示出改进的热稳定性。通过器件优化，实现了29.7 cd/A（21.2 lm/W，13.2%）的电流效率，以及国际照明委员会坐标（0.18，0.32）。该值与蓝色磷光聚合物具有竞争力，突出了PAE主链在大分子水平上实现高性能蓝色延迟荧光的重要性。
Polymer light-emitting diodes are attractive for optoelectronic applications owing to their brightness and ease of processing. However, often metals have to be inserted to increase the luminescence efficiency, and producing blue emitters is a challenge. Here we present a strategy to make blue thermally activated delayed fluorescence (TADF) polymers by directly embedding a small molecular blue TADF emitter into a poly(aryl ether) (PAE) backbone. Thanks to the oxygen-induced negligible electronic communication between neighboring TADF fragments, its corresponding blue delayed fluorescence can be inherited by the developed polymers. These polymers are free from metal catalyst contamination and show improved thermal stability. Through device optimization, a current efficiency of 29.7 cd/A (21.2 lm/W, 13.2%) is realized together with Commission Internationale de L'Eclairage coordinates of (0.18, 0.32). The value is competitive with blue phosphorescent polymers, highlighting the importance of the PAE backbone in achieving high-performance blue delayed fluorescence at a macromolecular level.