New thermally cross-linkable polymer and its application as a hole-transporting layer for solution processed multilayer organic light emitting diodes

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A new thermally cross-linkable copolymer containing reactive benzocyclobutene (BCB) units and the well-known hole-transporting moiety N,M '-bis(3-methylphenyl)-N,N '-diphenylbenzidine) (TPD) was synthesized and characterized. Thermal annealing of spun-cast films of the copolymer, followed by cross-linking at 200 degrees C, led to insoluble polymer films with a smooth surface. Green emitting fluorescent OLEDs were fabricated using the new cross-linkable polymer and compared with conventionally prepared devices. Using the thermally cross-linked copolymer as a hole-transporting layer, solution processed multilayer light emitting diodes were prepared that exhibited high performance with 10.4% external quantum efficiency at a brightness of 350 cd/m(2).
Publisher
AMER CHEMICAL SOC
Issue Date
2007-09
Language
English
Article Type
Article
Keywords

CONJUGATED POLYMERS; DEVICES OLEDS; PERFORMANCE; POTENTIALS; LEDS

Citation

CHEMISTRY OF MATERIALS, v.19, no.19, pp.4827 - 4832

ISSN
0897-4756
DOI
10.1021/cm0715500
URI
http://hdl.handle.net/10203/92288
Appears in Collection
CBE-Journal Papers(저널논문)
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