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Synthesis and characterization of fluorene-based copolymers as electron-transporting materials for PLEDs

Title
Synthesis and characterization of fluorene-based copolymers as electron-transporting materials for PLEDs
Author
김낙중
Keywords
PLEDs; Fluorene-based copolymers; Alcohol-soluble; Electron-transporting materials
Issue Date
2015-10
Publisher
ELSEVIER SCIENCE BV
Citation
ORGANIC ELECTRONICS, v. 25, Page. 206-211
Abstract
Owing to their low cost, easy processing, and the possibility of flexible fabrication, polymer light-emitting diodes (PLEDs) are emerging as an important class of materials. Despite promising characteristics, the relatively easy ionization of the well-known low-work-function cathodes such as Ca and Ba prevents the full usage of these materials. Herein, we report the syntheses of three alcohol-soluble conjugated polymers with different conjugation lengths and electron affinities as electron injection and transport materials for PLEDs: poly[9,9-bis(2-dihexylaminoethoxy) fluorene-co-tetrafluorobenzene] (PFOH-1), poly[9,9-bi s(2-dihexylaminoethoxy) fluorene-co-thiophene] (PFOH-2), and poly[9,9-bis(2-dihexylaminoethoxy) fluorene-co-benzo-thiadiazole] (PFOH-3). For comparison, devices using Al, Ca, and Al cathodes were also fabricated. The device based on the Al cathode showed lower performance with a luminescence efficiency of 0.93 cd/A and a luminance of 248 cd/m(2); that based on the low-work-function metal Ca as the cathode showed a near-threefold increase in luminescence efficiency at 2.51 cd/A and brightness at 856 cd/m2 owing to greatly enhanced electron injection from the cathode; and the device employing the PFOH-3/Al cathode exhibited a luminescence efficiency of 2.35 cd/A and a brightness of 667 cd/m2 at a current density of 35 mA/cm(2), which is comparable with the performance of the device with the Ca cathode. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S1566119915002669?via%3Dihubhttp://hdl.handle.net/20.500.11754/28297
ISSN
1566-1199; 1878-5530
DOI
10.1016/j.orgel.2015.06.018
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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