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Effect of NaCl buffer layer on the performance of organic light-emitting devices (OLEDs)

  • S. W. Shi (a1) (a2), D. G. Ma (a2) and J. B. Peng (a1)

Abstract

The characteristics of organic light-emitting devices based on tris-(8-hydroxyquinoline) aluminum (Alq3) with NaCl thin films inserted at both anode/organic and organic/cathode interfaces are investigated. We optimize the thicknesses of NaCl at both interfaces, and we get the optimal device with the structure of ITO/NaCl(2.0 nm)/N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1' biphenyl-4,4'-dimaine (NPB)/Alq3/NaCl(2.0 nm)/Al. The device shows much better electroluminescent (EL) performance than that of the as-stated standard device with only LiF buffer layer. The maximal current efficiency and power efficiency is improved by 31% and 67%, the turn-on voltage is also reduced from 4.2 V for the standard device to 3.1 V for our target device. This is due to enhanced electron injection and blocked hole injection, which results in more balanced hole and electron currents.

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Keywords

Effect of NaCl buffer layer on the performance of organic light-emitting devices (OLEDs)

  • S. W. Shi (a1) (a2), D. G. Ma (a2) and J. B. Peng (a1)

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