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Acta Phys. -Chim. Sin.  2007, Vol. 23 Issue (11): 1821-1826    DOI: 10.3866/PKU.WHXB20071132
Influence of Electrode Materials on the Performance of NPB/Alq3 Organic Electroluminescent Devices
YU Jun-Sheng; SUO Fan; LI Wei-Zhi; LIN Hui; LI Lu; JIANG Ya-Dong
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
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Abstract   Double-layer heterojunction organic electroluminescent devices (OELDs) with a conventional structure of anode/N,N’-bis-(3-naphthyl)-N,N’-biphenyl-(1,1’-biphenyl)-4,4’-diamine [NPB(40 nm)]/tris-(8-hydroxyquinoline)-aluminum[Alq3(50 nm)]/cathode were fabricated using different materials as anode and cathode. The impact of electrode materials on device performance was studied by varying the electrodes of OELDs. The testing results of device electroluminescent characteristics showed that the current-voltage (I-V) relationship of the devices is in accordance with the theory of trapped charge limited current (TCLC) regime. Due to the disorder of organic material energy levels and the dependence of carrier mobility on temperature as well as electric field, charge carrier injection ability of different electrodes was not necessarily dependent on the work function of the electrodes. The introduction of hole transporting layer in double-layer devices enables the recombination zone of charge carriers to locate near the interface of organic heterojunction, which efficiently reduces the quenching effect of electrode on excitons, and thus largely enhances device performance. In addition, the microcavity effect in OELDs device with metallic electrode may lead to the shift of emissive spectra and the shrinkage of spectrum full width at half maximum. The results showed that enhanced device performance compared with conventional device can be anticipated by surface modification and optimization of metallic electrodes.

Key wordsOrganic electroluminescence      Electrode material      TCLC      Exciton quenching      Device performance     
Received: 12 April 2007      Published: 27 July 2007
MSC2000:  O649  
Corresponding Authors: YU Jun-Sheng     E-mail:
Cite this article:

YU Jun-Sheng; SUO Fan; LI Wei-Zhi; LIN Hui; LI Lu; JIANG Ya-Dong. Influence of Electrode Materials on the Performance of NPB/Alq3 Organic Electroluminescent Devices. Acta Phys. -Chim. Sin., 2007, 23(11): 1821-1826.

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