Journal of Guangdong University of Technology ›› 2004, Vol. 21 ›› Issue (2): 12-15.

• Comprehensive Studies • Previous Articles     Next Articles

Impact of the Cathode Materials on the Performance of Polymer Light-emitting Devices

  

  1. (Dept. of Applied Physics,Guangdong University of Technology,Guangzhou 510520,China)
  • Online:2004-06-03 Published:2004-06-03

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Abstract: Double-layer polymer light-emitting devices (PLEDs),based on poly(9,9-dioctylfluoren-4,7-di-2-thienyl-2,1,3-benzothiadiazole)(PDOF-DBT,m(DOF):m(DBF)=85:15),using alkaline metals, alkaline earth metals and insulated materials as the cathode,show different characteristics. Device with Ba(a thickness of about 3nm) as cathode shows better performance:the external quantum efficiency is 1.6%, and the highest light intensity is close to 4000cd/m~2.The result demonstrates the interface between PDOF-DBT and this kind cathode with good energetic contact, and electron-injecting equilibrium.

Key words: polyfluorene； PLEDs； cathode； double layer；

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