Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5366092 | Applied Surface Science | 2006 | 5 Pages |
Abstract
An efficient cathode NaCl/Ca/Al used to improve the performance of organic light-emitting devices (OLEDs) was reported. Standard N,Nâ²-bis(1-naphthyl)-N,Nâ²-diphenyl-1,1â² biphenyl 4,4â²-dimaine (NPB)/tris-(8-hydroxyquinoline) aluminum (Alq3) devices with NaCl/Ca/Al cathode showed dramatically enhanced electroluminescent (EL) efficiency. A power efficiency of 4.6Â lm/W was obtained for OLEDs with 2Â nm of NaCl and 10Â nm of Ca, which is much higher than 2.0Â lm/W, 3.1Â lm/W, 2.1Â lm/W and 3.6Â lm/W in devices using, respectively, the LiF (1Â nm)/Al, LiF (1Â nm)/Ca (10Â nm)/Al, Ca (10Â nm)/Al and NaCl (2Â nm)/Al cathodes. The investigation of the electron injection in electron-only devices indicates that the utilization of the NaCl/Ca/Al cathode substantially enhances the electron injection current, which in case of OLEDs leads to the improvement of the brightness and efficiency.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Shengwei Shi, Dongge Ma,