A Study on the Various Organic Electroluminescent Devices Using Lanthanide Chelate Metal Complexes

란탄계 금속 착화합물을 이용한 다양한 유기 전기 발광 소자의 연구

  • 표상우 (홍익대학교 전기·제어공학과) ;
  • 김윤명 (홍익대학교 전기·제어공학과) ;
  • 이한성 (홍익대학교 전기·제어공학과) ;
  • 김정수 (홍익대학교 전기·제어공학과) ;
  • 이승희 (홍익대학교 화학공학과) ;
  • 김영관 (홍익대학교 화학공학과)
  • Published : 2000.04.01

Abstract

In this study several lanthanide complexes such as Eu(TTA)$_3$(Phen), Tb(ACAC)$_3$-(Cl-Phen) were synthesized and the white-light electroluminescence(EL) characteristics of their thin films were investigated where the devices having structures of anode/TPD/Tb(ACAC)$_3$(Cl-Phen)/Eu(TTA)$_3$(Phen)/Alq$_3$or Bebq$_2$/cathode and the low work function metal alloy such as Li:Al was used as the electron injecting electrode(cathode). Device structure of glass substrate/ITO/TPD(30nm)/Tb(ACAC)$_3$(Phen)(30nm)/Eu(TTA)$_3$(Phen)(6nm)/DCM doped Alq$_3$(10nm)/Alq$_3$(20nm)/Li:Al(100nm) was also fabricated and their EL characteristics were investigated where Eu(TTA)$_3$(Phen) and DCM doped Alq$_3$were used as red light-emitting materials. It was found that the turn-on voltage of the device with non-doped Alq$_3$was lower than that of the devices with doped Alq$_3$and the blue and red light emission peaks due to TPD and Eu(TTA)$_3$(Phen) with non-doped Alq$_3$were lower than those with DCM doped Alq$_3$Details on the white-light-emitting characteristics of these device structures were explained by the energy and diagrams of various materials used in these structure where the energy levels of new materials such as ionization potential(IP) and electron affinity(EA) were measured by cyclic voltametric method.

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