Highly efficient tandem organic light-emitting devices utilizing the connecting structure based on n-doped electron-transport layer/HATCN/hole-transport layer
Journal
Applied Optics
Journal Volume
53
Journal Issue
22
Pages
E1-E6
Date Issued
2014-08
Author(s)
Abstract
In this work, we conducted studies of tandem organic light-emitting devices (OLEDs) based on the connecting structure consisting of n-doped electron-transport layer (n-ETL)/1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HATCN)/hole-transport layer. We investigated effects of different n-ETL materials and different HATCN thicknesses on characteristics of tandem OLEDs. Results show that the tandem OLEDs with n-BPhen and a 20 nm layer of HATCN in the connecting structure exhibited the best performance. With these, highly efficient and bright green phosphorescent two-emitting-unit tandem OLEDs, with drive voltages significantly lower than twice that of the single-unit benchmark device and current efficiencies higher than twice that of the single-unit benchmark device, were demonstrated. © 2014 Optical Society of America.
Other Subjects
Current density; Doping (additives); Electron transport properties; Light emission; Current efficiency; Drive voltage; Electron transport layers; N-doped; Organic light-emitting devices; Structure-based; Organic light emitting diodes (OLED)
Type
journal article