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The morphology and photoelectronic properties of poly(9,9′‐dioctylfluorene)/ethyl‐cyanoethyl cellulose blends
Author(s) -
He Benqiao,
Li Jing,
Bo Zhishan,
Huang Yong
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26768
Subject(s) - materials science , morphology (biology) , polymer blend , electroluminescence , photoluminescence , phase (matter) , chemical engineering , cellulose , ethyl cellulose , polymer chemistry , nanoscopic scale , polymer , composite material , copolymer , nanotechnology , organic chemistry , chemistry , optoelectronics , genetics , layer (electronics) , engineering , biology
The morphology and photoelectronic properties of blend films of poly(9,9′‐dioctylfluorine) (PF) and ethyl–cyanoethyl cellulose [(E‐CE)C] were investigated. It was found that the morphology of the blends was changed with the blend composition. The lateral phase separation was observed in submicron scale, and a nanoscale vertical phase separation occurred with enrichment of the (E‐CE)C at the surface of the blend films. The photoluminescent spectra of the blend films are blue‐shifted with the increase of the (E‐CE)C. The photoelectronic properties of the blends varied with the morphology of the blends. In the electroluminescent device, the turn‐on voltage was almost identical for the device with 50% or above 50 wt % PF in blend films and markedly improved for the device with only 25 wt % PF. The external quantum efficiency of the device fabricated with 75% PF is the highest among the device fabricated with the PF/(E‐CE)C blend films. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007