Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (04): 455-458.doi: 10.1016/S1872-1508(07)60029-1

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Efficient Organic Light-emitting Diode Using Lithium Tetra-(8-hydroxy-quinolinato) Boron as the Electron Injection Layer

ZHANG Rui; LI Yang; DUAN Lian; ZHANG De-Qiang; QIU Yong   

  1. Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
  • Received:2007-01-10 Revised:2007-02-05 Published:2007-04-05
  • Contact: ZHANG De-Qiang


High performance organic light-emitting diodes (OLEDs) with lithium tetra-(8-hydroxy-quinolinato) boron (LiBq4), instead of LiF, as the electron injection layer, and aluminum as the cathode were fabricated. In the fabrication of the devices, N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) was used as the hole transport layer, and tri-(8-quinolinolato) aluminum (Alq3) as the emitting and electron transport layer. By using LiBq4 as the electron injection layer, the device's performance with regard to luminance, current efficiency, and turn-on voltage was superior to that of the device using LiF as the electron injection layer. The experimental results could be explained by the improved electron injection and charge balance.

Key words: Lithiumtetra-(8-hydroxy-quinolinato) boron, Electron injection, Organic light-emitting diodes


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