A blue organic emitting diode from anthracene derivative

A blue, organic, light-emitting diode (OLED) has been made from a new blue emitting material. The structure of the blue device is indium tin oxide (ITO)/CuPc/NPB/JBEM:perylene/Alq/MgAg. Here copper phthalocyanine (CuPc) is used as a buffer layer, N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) as the hole transporting layer, 9,10-bis(3'5'-diaryl)phenyl anthracene (JBEM) as the blue emitting host, perylene as the blue dopant, Tris(8-guinolinolato) aluminium complex (Alq) as the electron transporting material, and M-Ag alloy as the cathode. The blue device has a maximum luminance of 7526 cd/m(2), and the luminance at a cut-rent density of 20 mA/cm(2) is 408 cd/m(2). It has a maximum efficiency of 1.45 lm/W., Commission Internationale de l'Eclairage (CIE) co-ordinates x = 0.14, y = 0.21, and a half-life of 1035 h at initial luminance of 100 cd/m(2). It shows a better stability than the blue device from distyrylarylene derivatives as the blue emitting host, and also perylene as the dopant with the same structure. (C) 2001 Elsevier Science B.V. All rights reserved.