Abstract
A novel white emitting organic diode has been simply realized by inserting a doped hole-blocking layer between the hole transporting layer (HTL) and the electron transporting layer (ETL). The structure of this device is ITO/CuPc/NPB/blocking layer:rubrene/Alq/MgAg. Copper phthalocyanine(CuPc) was used as a buffer layer, N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) as the HTL, and trimer of N-arylbenzimidazoles (TPBi) as the blocking layers, in which rubrene is doped. Tris(8-quinolinolato)aluminum complex(Alq) as ETL. Indium tin oxide and MgAg were the anode and cathode, respectively. The emission spectrum of this device covers a wide range of visible region and can be sensitively adjusted by the concentration of rubrene. The white emission with the CIE (Commission International de l'Eclairage) color coordinates x = 0.31, y = 0.32, a maximum luminance of 8635 cd/m2, and the luminous efficiency 1.39 lm/W at the luminance of 100 cd/m2 were obtained in the device with 1.5% rubrene concentration in TPBi.
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