Blue-emitting carbon- and nitrogen-bridged poly(ladder-type tetraphenylene)s

被引:64
作者
Mishra, Ashok K.
Graf, Michael
Grasse, Florian
Jacob, Josemon
List, Emil J. W.
Muellen, Klaus
机构
[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[2] Graz Univ Technol, Inst Solid State Phys, Christian Doppler Lab Adv Funct Mat, A-8010 Graz, Austria
[3] Inst Nanostructured Mat & Photon, A-8160 Weiz, Austria
关键词
D O I
10.1021/cm060072a
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
An efficient synthesis has been developed toward two new poly(ladder-type tetraphenylene)s, either with one nitrogen at the bridge-head position or all carbon-bridged, both of which were blue emitters. The two polymers exhibited very narrow emission centered around 445 nm, where the human eye is most sensitive. Polymer light-emitting diodes prepared under inert atmosphere in the standard configuration (indium tin oxide/poly(3,4-ethylenedioxythiophene): polystyrenesulfonic acid/polymer/Ca/Al) demonstrated very high luminance values, typically over 600-900 cd/m(2) at a bias of 10-15 V for the two polymers. The nitrogen-bridged poly(ladder-type tetraphenylene) demonstrated a lower electroluminescence onset voltage and was found to be more stable toward oxidative degradation compared to the all-carbon-bridged analogue, which undergoes oxidative degradation as evidenced by the appearance of a new emission maximum around 575 nm.
引用
收藏
页码:2879 / 2885
页数:7
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