Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9812283 | Thin Solid Films | 2005 | 4 Pages |
Abstract
A cathode system comprising an ultra thin sodium chlorate (NaCl) layer and an overlaid calcium (Ca) metal in polymer light-emitting diodes (PLEDs) based on poly[2-methoxy,5-(2-ethylhexoxy)-1,4-phenylene vinylene] is presented. It is demonstrated that introducing a thin NaCl layer further improves the brightness and electroluminescent efficiency of PLEDs. The maximum brightness and efficiency, respectively, reached 22Â 000 cd/m2 and 3.5 lm/W for PLEDs with a 1 nm NaCl layer, which are much higher than 18Â 500 cd/m2 and 2.0 lm/W for PLEDs with Ca cathode. The investigation of the electron injection in electron-only devices with and without a NaCl layer indicates that the introduction of the NaCl layer substantially enhances the electron injection current, which in case of PLEDs leads to the improvement of the brightness and efficiency.
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Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Yufeng Hu, Shengwei Shi, Yanguang Zhang, Quanguo Zhou, Lixiang Wang, Dongge Ma, Xinglin Li,