Title :
Synthesis of polymers for hole and electron transport materials in organic electroluminescent devices
Author :
Son, Jhun Mo ; Sakaki, Yuichi ; Ogino, Kenji ; Sato, Hisaya
Author_Institution :
Fac. of Technol., Tokyo Univ. of Agric. & Technol., Japan
fDate :
8/1/1997 12:00:00 AM
Abstract :
Styrene-type polymers having tetraphenylbenzidine (TPD) or tetraphenylphenyldiaminobenzene unit (PDA) and a oxadiazole unit (PBD) on the side chain were prepared as hole and electron transport materials, respectively, of an electroluminescent (EL) device. The device structures employed were [indium-tin-oxide (ITO)/hole transport layer (HTL)/Al] (type I), or [ITO/hole transport layer (HTL)/electron transport layer (ETL)/Al] (type II). Type I devices provided current density higher than 100 mA/cm2 but no luminescence was observed. Type II devices emitted luminescence of about 10 cd/m2 at the current density of about 170 mA/cm2. The emission maximums of these devices were 460 and 530 nm for the device using TPD and PDA, respectively
Keywords :
conducting polymers; current density; electroluminescent devices; materials preparation; organic semiconductors; polymer films; polymerisation; 460 nm; 530 nm; Al; EL device; ITO; ITO/hole transport layer/Al structure; ITO/hole transport layer/electron transport layer/Al structure; InSnO; PDA; TPD; current density; electron transport materials; hole transport materials; luminescence; organic electroluminescent devices; oxadiazole; polymer synthesis; styrene-type polymers; tetraphenylbenzidine; tetraphenylphenyldiaminobenzene; Charge carrier processes; Crystals; Current density; Electroluminescent devices; Fluorescence; Indium tin oxide; Luminescence; Organic materials; Polymer films; Voltage;
Journal_Title :
Electron Devices, IEEE Transactions on
