聚合物
材料科学
氧化铟锡
光化学
化学工程
量子效率
图层(电子)
化学
光电子学
纳米技术
有机化学
工程类
作者
Kaustav Dey,S. Roy Chowdhury,Erik Dykstra,H. Peter Lu,Ruth Shinar,J. Shinar,Pavel Anzenbacher
出处
期刊:ACS applied electronic materials
[American Chemical Society]
日期:2021-08-06
卷期号:3 (8): 3365-3371
被引量:11
标识
DOI:10.1021/acsaelm.1c00354
摘要
The problems with fabrication of solution-processed organic light-emitting diodes (OLEDs) stem largely from the defects associated with sequential deposition of the layers, solvent-induced surface erosion, and layer mixing. Herein, we demonstrate that a photopolymerizable bis-diazirine molecule can easily convert soluble polymers into cross-linked insoluble materials, alleviating the problems associated with inter-layer mixing. Upon 5–20 min irradiation with long wavelength/low power UV (1.8 mW/cm2) bis-diazirines results in the formation of carbenes that can react via carbon–hydrogen bond insertion with polymers or small molecules yielding cross-linked networks. The effectiveness of the bisdiazirine-mediated photo-cross-linking has been studied by investigating the surface morphology of the hole-transporting material polyvinylcarbazole (PVK), which exhibited 45% decrease in surface roughness after 15 min of the UV irradiation. The effect of this cross-linking procedure on device performance was studied in OLEDs with the configuration of indium tin oxide/PEDOT:PSS/PVK:(0–10%) cross-linker/PFO:2% F8BT/TPBI/CsF/Al. After the photolysis of the diazirines, the experimental devices exhibited a 42% enhancement in the maximum external quantum efficiency (EQEmax), from 1.2 to 1.7%, and a maximum luminous efficiency improvement from 3.9 to 5.4 cd/A. Overall, this observation suggests that 3-trifluoromethyl(aryl)diazirine-based cross-linking processes is a promising method for fabrication of polymer LEDs.
科研通智能强力驱动
Strongly Powered by AbleSci AI