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Effective barrier height and work function of Mg:Ag thin films with a low Mg concentration acting as cathodes in high-efficiency organic light emitting devices |
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| Authors: | D.C. Choo D.U. Lee J.W. Han |
| Affiliation: | a Division of Electronics and Computer Engineering, Research Institute of Information Display, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea b Department of Electronic Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, South Korea c Charged Particle Beam and Plasma Laboratory/PDP Research Center, Department of Electrophysics, Kwangwoon University, Seoul 139-701, South Korea |
| Abstract: | Organic molecular-beam deposition (OMBD) of Mg:Ag thin films with a low Mg concentration on tris(8-hydroxyquinolino) aluminum (Alq3) layers at room temperature was performed to investigate the feasibility of using Mg:Ag thin films as cathode electrodes in organic light-emitting devices (OLEDs). The effective barrier height of the Mg:Ag (5:95) thin films grown on the Alq3 layers, determined from the current-voltage measurements, was as low as 0.22 eV. The work function of the Mg:Ag (5:95) thin film, determined from the secondary electron emission coefficients obtained by using focused ion beam, was 4.12 eV. These results indicate that Mg:Ag (5:95) thin films with a low Mg concentration grown by using the OMBD method hold promise for potential applications as cathode electrodes in high-efficiency OLEDs. |
| Keywords: | 68.55.jk 72.15.Eb 73.20.At |
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