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Synergetic interface and morphology modification to achieve highly efficient solution-processed sky-blue organic light-emitting diodes
Organic Electronics ( IF 3.2 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.orgel.2020.105721
Bo Li , Dandan Song , Zheng Xu , Bo Qiao , Weiye Zheng , Jian Yang , Wenzhu Jing , Suling Zhao

Solution-processed organic light-emitting diodes (OLEDs), especially blue OLEDs, generally suffer from the low efficiency. Herein, we report an efficient approach to achieve high efficiency by synergetic interface and morphology modification with a polymer, Poly(9-vinylcarbazole) (PVK). Sky-blue thermally activated delayed fluorescent (TADF) material, 10-(4-(4,6-diphenyl-1,3,5- triazin-2-yl)phenyl)-10H- spiro[acridine-9,9′-fluorene] (SpiroAC-TRZ), is used as the emitter. The incorporation of PVK thin layer at the hole injection layer/emission layer (EML) interface and a small amount of PVK inner the EML modify the carrier behaviors at the interface and improve the EML morphology. As a result, balanced carrier distribution and reduced carrier recombination are realized at the interface and inner the EML. Through these strategies, the maximum external quantum efficiency and current efficiency of the optimal OLED achieve 25.1% and 53.5 cd/A. To the best of our knowledge, the efficiencies are the highest values ever achieved by the solution-processed sky-blue TADF OLEDs.



中文翻译:

协同界面和形态修饰,以实现高效固溶处理的天蓝色有机发光二极管

溶液处理的有机发光二极管(OLED),特别是蓝色OLED,通常效率低下。在这里,我们报告了一种有效的方法,可通过与聚合物聚(9-乙烯基咔唑)(PVK)进行协同界面和形态修饰来实现高效率。天蓝色热激活延迟荧光(TADF)材料10-(4-(4,6-二苯基-1,3,5-三嗪-2-基)苯基)-10H-螺[ac啶-9,9'-芴](SpiroAC-TRZ),用作发射器。在空穴注入层/发射层(EML)界面处并入PVK薄层,并在EML内部加入少量PVK会改变界面处的载流子行为,并改善EML形态。结果,在接口和内部EML处实现了平衡的载流子分配和减少的载流子重组。通过这些策略,最佳OLED的最大外部量子效率和电流效率达到25.1%和53.5 cd / A。据我们所知,效率是经过溶液处理的天蓝色TADF OLED所实现的最高值。

更新日期:2020-03-20
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