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Efficient electron injection from bilayer cathode consisting of aluminum and alcohol/water‐soluble conjugated polymers
Author(s) -
Wu Hongbin,
Huang Fei,
Mo Yueqi,
Yang Wei,
Peng Junbiao,
Cao Yong
Publication year - 2005
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2012594
Subject(s) - conjugated system , bilayer , polymer , materials science , cathode , aluminium , alcohol , electron , chemical engineering , nanotechnology , optoelectronics , composite material , chemistry , organic chemistry , membrane , physics , biochemistry , quantum mechanics , engineering
— A novel bilayer cathode has been developed that forms an effective electron‐injecting contact to a variety of red‐, green‐, and blue‐emitting polymers. An efficient electron injection directly from Al can be realized by incorporation of a thin layer of water‐ or alcohol‐soluble copolymer between the metal and emitting layer. The device performance of polymer LEDs fabricated with such bilayer cathodes is comparable to or even higher than that obtained by using typical low‐work‐function Ca and Ba cathodes. The utilization of alcohol or water‐soluble conjugated polymer as an electron‐injection layer in combination with air‐stable metals is of special importance for PLEDs, since it enables the fabrication of multilayer devices by spin‐coating, without intermixing between the emitting layer and the injection layers.