Li Wentao, He Yani, Miao Tiezheng, Lü Xingqiang, Fu Guorui, Wong Wai-Yeung, He Hongshan
School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, China.
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
ACS Appl Mater Interfaces. 2021 Mar 10;13(9):11096-11107. doi: 10.1021/acsami.0c16581. Epub 2021 Mar 1.
All-solution-processed multilayered white polymer light-emitting diodes (WPLEDs) are promising candidates for low-cost and large-area flexible full-color flat-panel displays and solid-state lighting. However, it is still challenging to improve their performance. In this work, based on an elegant strategy of orthogonal materials, the utilization of the cross-linked Ir polymer film ( = -vinyl-carbazole; = 1-(4-vinylbenzyl)-2-phenyl-1-benzo[]imidazole; and = acetylacetone) as the emitting layer (EML) between a hydrophilic polymer film poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) () as the hole injection layer (HIL) and a hydrophobic polymer film ( = 2-(4-(-butyl)phenyl)-5-(4'-vinyl-[1,1'-biphenyl]-4-yl)-2,5-dihydro-1,3,4-oxadiazole) as the electron transport layer (ETL) led to the successful fabrication of reliable all-solution-processed multilayered WPLEDs. The device exhibits a η of 18.19 cd/A, a η of 8.16 lm/W, and a η of 9.32% with stable white light (Commission International De L'Eclairage (CIE) coordinates = 0.269-0.283, = 0.317-0.330; corrected color temperatures (CCTs) of 7237-8199 K, and CRIs (color rendering indices) of 63-72) under a wide applied-voltage range. Its high performance, especially with record efficiencies among those of reported all-solution-processed WPLEDs, renders cross-linked Ir polymers a new platform to all-solution-processed multilayered WPLEDs.
全溶液处理的多层白色聚合物发光二极管（WPLED）是低成本、大面积柔性全彩平板显示器和固态照明的理想候选者。然而，提高其性能仍然具有挑战性。在这项工作中，基于一种巧妙的正交材料策略，将交联的铱聚合物薄膜（ = -乙烯基咔唑； = 1-(4-乙烯基苄基)-2-苯基-1-苯并[]咪唑； = 乙酰丙酮）用作发射层（EML），介于作为空穴注入层（HIL）的亲水性聚合物薄膜聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（）和作为电子传输层（ETL）的疏水性聚合物薄膜 （ = 2-(4-(-丁基)苯基)-5-(4'-乙烯基-[1,1'-联苯]-4-基)-2,5-二氢-1,3,4-恶二唑）之间，成功制备了可靠的全溶液处理多层WPLED。该器件在宽电压范围内表现出18.19 cd/A的电流效率（η）、8.16 lm/W的功率效率（η）和9.32%的外量子效率（η），发出稳定的白光（国际照明委员会（CIE）坐标 = 0.269 - 0.283， = 0.317 - 0.330；校正色温（CCT）为7237 - 8199 K，显色指数（CRI）为63 - 72）。其高性能，特别是在已报道的全溶液处理WPLED中具有创纪录的效率，使交联铱聚合物成为全溶液处理多层WPLED的新平台。
