Bright-blue electroluminescence from a silyl-substituted ter-(phenylene-vinylene) derivative

A bright-blue electroluminescent device has been fabricated by using an emissive dopant and an electron-transporting host. The dopant was a highly photoluminescent silyl-substituted ter-(phenylene-vinylene) derivative [1,4-bis[4-(2-trimethylsilylvinly) styryl]-2,5-dibutoxybenzene (BTSB)]. BTSB was doped into a trimer of N-arylbenzimidazoles (TPBI) which functioned as the host and electron transporter. N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4-4'-diamine (NPB) was used as the hole transporter. The device, with a structure of indium tin oxide\NPB\TPBI:10% BTSB\TPBI\Mg:Ag, shows a bright blue emission of 11000 cd/m(2) at a current density of 360 mA/ cm(2). The current efficiency of this device is about 3.2 cd/A at 20 mA/ cm(2). (C) 1999 American Institute of Physics. [S0003-6951(99)03606-2].