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Performance improvement of rubrene-based organic light emitting devices with a mixed single layer

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Abstract

We have investigated the performance of organic light-emitting devices (OLEDs) with a rubrene-doped mixed single layer by using 4,4′-bis[N-(1-napthyl)-N-phenyl- amion] biphenyl (α-NPD) as hole transport layer. Comparing to a conventional heterostructure OLED, equal luminance vs. current density characteristics were obtained. In addition, maximum power efficiency was threefold improved, and the achieved value was 5.90 lm/W by optimizing a mixing ratio of hole and electron transport materials. By evaluating the temperature dependence of the J – V characteristics for electron-injection dominated device, the electron injection from Al/LiF to mixed organic layer is attributed to Schottky thermal emission model. And the barrier height of the electron injection from Al/LiF into mixed single layer was obtained to be 0.62 eV, which is lower than Al/Alq3 interface. Meanwhile, the mixed single-layer device exhibited superior operational durability at a half-luminance of 2,250 h under a constant current operation mode. The reliability was improved with a factor of two compared to the heterostructure device due to the improvement of stability in mixed organic molecules and removal of the heterojunction interface in the mixed single-layer device.

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Authors and Affiliations

  1. Graduate School of Science & Technology, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan

    Zhaokui Wang, Shigeki Naka & Hiroyuki Okada

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  1. Zhaokui Wang
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  2. Shigeki Naka
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  3. Hiroyuki Okada
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Correspondence to Zhaokui Wang.

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Wang, Z., Naka, S. & Okada, H. Performance improvement of rubrene-based organic light emitting devices with a mixed single layer. Appl. Phys. A 100, 1103–1108 (2010). https://doi.org/10.1007/s00339-010-5710-4

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  • DOI: https://doi.org/10.1007/s00339-010-5710-4

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