基于激基复合物纯正发射的有机电致发光器件性能

Organic Light Emitting Devices Based on Pure Exciplex Electroluminescence

利用聚合物三苯基二胺衍生物(Poly-TPD)掺杂2,5-双(5-叔丁基-2-苯并恶唑基)噻吩(BBOT)作为器件发光材料,研制了基于激基复合物纯正发射的有机电致发光器件。器件的具体结构为:ITO/PEDOT∶PSS(25 nm)/Poly-TPD∶BBOT(1∶1,80 nm)/Al(70 nm)。研究结果表明,该器件的556 nm黄绿光发射来自于发光层Poly-TPD∶BBOT形成的电致激基复合物的单一发射,而源于Poly-TPD和BBOT的本征发射全部消失。

Exciplex emission is considered to be very important for understanding the fundamental processes of electronic excitation.Here we report a pure exciplex emission device of the binary-blend ITO/ Poly（3,4-ethylenedioxythiophene）∶poly（styrenesulfonate）（PEDOT∶PSS）/poly[-bis（4-butylphenyl）-bis（phenyl） benzidine]（Poly-TPD）∶2,5-bis（5-tert-butyl-2-benzoxazolyl） thiophene（BBOT）/Al.The luminance-voltage and current density-voltage characteristics of devices were investigated,and differences between their performances were discussed.The pure exciplex electroluminescence was investigated in terms of the energy level diagram of the Poly-TPD∶BBOT device.