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Influence of driving mode on the operation stability of organic light-emitting diodes

W. ZHANG1, Z. WU2,* , X. ZHANG2, S. LIANG2, B. JIAO2, X. HOU1,2

Affiliation

  1. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, PR China
  2. Key Laboratory of photonics Technology for information, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi’an Jiaot

Abstract

The influence of pulse current (PC) versus direct current (DC) driving mode on the operation stability of organic light-emitting diodes, which based on N,N’-di(naphthalene-1-yl)-N,N’-diphenylbenzidine (NPB) and tris(8-hydroxyquinoline) aluminum (Alq3) without hole-injection layer (HIL) and with two different HILs, was investigated. The two HILs were copper phthalocyanine (CuPc) and 4,4’,4’’-tris(3-methylphenylphenylamino) triphenylamine (m-MDTATA) respectively. It was found that the lifetimes of devices without HIL and with CuPc, m-MTDATA as the HIL under PC driving mode were 2, 1.5 and 0.9 times longer than that under DC driving mode respectively. Analysis of electrical characteristics of corresponding hole-only devices showed that the injected holes into device were greatly reduced by inserting m-MTDATA layer compared to the two other devices, and indicated that different ratios of the injected electrons / holes were obtained in these devices, which play a dominant role in the influence of driving mode on the operation stability.

Keywords

OLED, Stability, Driving mode, Electrons/holes.

Citation

W. ZHANG, Z. WU, X. ZHANG, S. LIANG, B. JIAO, X. HOU, Influence of driving mode on the operation stability of organic light-emitting diodes, Optoelectronics and Advanced Materials - Rapid Communications, 4, 9, September 2010, pp.1379-1383 (2010).

Submitted at: April 14, 2010

Accepted at: Sept. 15, 2010