Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5402746 | Journal of Luminescence | 2010 | 5 Pages |
Abstract
We investigated solution-processed films of 4,4â²-bis(2,2-diphenylvinyl)-1,1â²-bibenyl (DPVBi) and its blends with N,Nâ²-bis(3-methylphenyl)-(1,1â²-biphenyl)-4,4â²-diamine (TPD) by atomic force microscopy (AFM). The AFM result shows that the solution-processed films are pin-free and their morphology is smooth enough to be used in OLEDs. We have developed a solution-processed white organic light-emitting device (WOLEDs) based on small-molecules, in which the light-emitting layer (EML) was formed by spin-coating the solution of small-molecules on top of the solution-processed hole-transporting layer. This WOLEDs, in which the EML consists of co-host (DPVBi and TPD), the blue dopant (4,4â²-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl) and the yellow dye (5,6,11,12-tetraphenylnaphtacene), has a current efficiency of 6.0Â cd/A at a practical luminance of 1000Â cd/m2, a maximum luminance of 22500Â cd/m2, and its color coordinates are quite stable. Our research shows a possible approach to achieve efficient and low-cost small-molecule-based WOLEDs, which avoids the complexities of the co-evaporation process of multiple dopants and host materials in vacuum depositions.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
Dongdong Wang, Zhaoxin Wu, Xinwen Zhang, Dawei Wang, Xun Hou,