Performance improvement of rubrene-based organic light emitting devices with a mixed single layer |
| |
Authors: | Zhaokui Wang Shigeki Naka Hiroyuki Okada |
| |
Institution: | 1. Graduate School of Science & Technology, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan
|
| |
Abstract: | We have investigated the performance of organic light-emitting devices (OLEDs) with a rubrene-doped mixed single layer by
using 4,4′-bisN-(1-napthyl)-N-phenyl- amion] biphenyl (α-NPD) as hole transport layer. Comparing to a conventional heterostructure OLED, equal luminance vs. current density characteristics
were obtained. In addition, maximum power efficiency was threefold improved, and the achieved value was 5.90 lm/W by optimizing
a mixing ratio of hole and electron transport materials. By evaluating the temperature dependence of the
J
–
V
characteristics for electron-injection dominated device, the electron injection from Al/LiF to mixed organic layer is attributed to Schottky thermal emission model. And the barrier height of the electron injection from Al/LiF into mixed single layer was obtained to be 0.62 eV, which is lower
than Al/Alq3 interface. Meanwhile, the mixed single-layer device exhibited superior operational durability at a half-luminance of 2,250 h
under a constant current operation mode. The reliability was improved with a factor of two compared to the heterostructure
device due to the improvement of stability in mixed organic molecules and removal of the heterojunction interface in the mixed
single-layer device. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|