Photo-patternable hole-transport polymers for organic light-emitting diodes

被引:86
作者
Domercq, B
Hreha, RD
Zhang, YD
Larribeau, N
Haddock, JN
Schultz, C
Marder, SR
Kippelen, B [1 ]
机构
[1] Univ Arizona, Ctr Opt Sci, Tucson, AZ 85721 USA
[2] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA
关键词
D O I
10.1021/cm020862u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of soluble arylamine-based hole transporting polymers with various ionization potentials have been synthesized. The synthetic methodology allows for substitution of aryl groups on the amine with electron-withdrawing and electron-donating moieties which permits tuning of the redox potential of the polymer. The arylamine-based monomers have been copolymerized with cinnamate-based moieties to obtain photo-cross-linkable polymers. These materials can be cross-linked and patterned using a standard mask aligner designed for photolithographic applications. UV cross-linking conditions were optimized to obtain an insoluble hole-transport layer with stable electroluminescent properties. Using a photolithographic mask, these materials have been patterned into 10-50-mum-size features. These polymers have been used as hole-transport layers (HTLs) in multilayer light-emitting diodes ITO/HTL/AlQ(3)/Mg:Ag [ITO = indium tin oxide, AlQ(3) = tris(8-hydroxyquinolinato)aluminum]. The electroluminescent properties have been evaluated and compared between devices made from polymers with different ionization potentials. Electroluminescent devices have been fabricated using a multilayered structure of spin-coated hole-transport materials to enhance the overall electroluminescent properties. Fully spin-coated devices have also been fabricated by spinning a blend of polystyrene and AlQ(3) on top of a cross-linked hole-transport layer.
引用
收藏
页码:1491 / 1496
页数:6
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