Highly efficient fluorene- and benzothiadiazole-based conjugated copolymers for polymer light-emitting diodes
Highly efficient fluorene- and benzothiadiazole-based conjugated copolymers for polymer light-emitting diodes
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DOI：
10.1021/ma020405z
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发表时间：
2002-07-30
期刊：
影响因子：
5.5
通讯作者：
Jen, AKY
中科院分区：
文献类型：
--
作者：
Herguch, P;Jiang, XZ;Jen, AKY
合成了一系列适用于聚合物发光二极管的高效共轭聚合物。这些聚合物基于9，9-二己基芴和苯并噻二唑（BT）之间的共聚。在几种情况下，添加第三共聚单体以调节聚合物的电荷注入和传输性质。所有这些共聚物在540 nm附近都表现出很强的绿色发射，这可以归因于聚合物的富电子链段和含缺电子BT链段之间的电荷转移或不同聚合物链之间的Forster能量转移。这些共聚物也表现出非常高的光致发光量子效率高达55%。用其中一种共聚物作为发光层的双层器件显示出低的开启电压（3.4V）、非常高的外量子效率（6.0%）和59400 cd/cm（2）的高亮度。
A series of highly efficient conjugated polymers have been synthesized for application in polymer light-emitting diodes (PLEDs). These polymers were based on the copolymerization between 9,9-dihexylfluorene and benzothiadiazole (BT). In several cases, a third comonomer was added to adjust the charge injecting and transporting properties of the polymers. All of these copolymers exhibited strong green emission at around 540 nm which can be attributed to either the charge transfer between an electron-rich segment and an electron-deficient BT-containing segment of the polymers or the Forster energy transfer between different polymer chains. These copolymers also exhibited very high photoluminescence quantum efficiencies up to 55%. A double-layer device using one of the copolymers as the emissive layer exhibited a low turn-on voltage (3.4 V), a very high external quantum efficiency (6.0%), and a high brightness of 59 400 cd/cm(2).