Open AccessElectroluminescence characteristics of a blend system based on a novel fluorene-carbazole copolymer and PVK doping system
Author(s) -
Shiquan Fan,
Junsheng Yu,
Deng Jing,
Yadong Jiang,
Rui Wang,
Weizhi Wang,
Tianxi Liu
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.6685
Subject(s) - materials science , electroluminescence , carbazole , indium tin oxide , fluorene , doping , copolymer , optoelectronics , indium , light emitting diode , oled , photoluminescence , photochemistry , polymer , chemical engineering , thin film , nanotechnology , composite material , layer (electronics) , chemistry , engineering
The photoluminescent and electroluminescent characteristics of a blend polymer system consisting of a novel fluorene-carbazole copolymer (PFC) and poly(vinylcarbazole) (PVK) were investigated. Three OLED devices with the structures of indium-tin-oxide (ITO)/PVK:PFC/bathocuproine(BCP)/tris-(8-hydroxylquinoline)-aluminum (Alq3)/Mg∶Ag, indium-tin-oxide(ITO)/PFC/bathocuproine(BCP)/Alq3/Mg∶Ag and indium-tin-oxide(ITO)/PVK/ bathocuproine(BCP)/Alq3/Mg∶Ag respectively, were fabricated. The optoelectronic properties of the devices were measured. The results demonstrated that PVK in the blend system effectively restrained the formation of PFC excimers in solid films. Light emission of the device with blend system shifted with the variation of applied electric field, and variable color ranging from green to blue could be obtained. The luminance of blue light reached 1650cd/m2 when the drive voltage was higher than 7V. It was inferred that an energy transfer process from PVK to PFC might have occurred in this blend system.