Balancing charge carrier mobility by constructing chemical structures to contain both hole- and electron-tran sporting moieties in electroluminescent organic compounds
Balancing charge carrier mobility by constructing chemical structures to contain both hole- and electron-tran sporting moieties in electroluminescent organic compounds
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DOI：
10.1016/j.synthmet.2005.03.004
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发表时间：
2005-05-10
期刊：
影响因子：
4.4
通讯作者：
Jin, J
中科院分区：
文献类型：
--
作者：
Cha, SW;Joo, SH;Jin, J
为了平衡载流子传输，我们设计并合成了两种由电子和空穴传输结构部分组成的新化合物：电子传输部分是二芳基-1,3,4-恶二唑（Oxa）基团和空穴传输部分咔唑（Cz）或三苯胺（TPA）部分。该化合物在真空沉积时形成非晶态玻璃薄膜，其玻璃化转变温度（T-g）接近或高于150℃。研究了它们的电子结构（最高占据分子轨道（HOMO）、最低未占据分子轨道（LUMO）和E-g值）以及化合物中的空穴和电子迁移率。一些带有恶二唑部分的化合物在 7.5 x 10(5) V/cm 的电场下显示出大于 1.0 x 10(-4) cm(2)/(V s) 的电子迁移率。单层发光电致发光（EL）器件表明，用具有平衡载流子迁移率的化合物制造的器件的外量子效率远高于主要由空穴或电子传输部分组成的化合物。 (c) 2005 Elsevier B.V. 保留所有权利。
For the purpose of balancing charge carriers' transport, we designed and synthesized two new compounds that are composed of both electron- and hole-tran sporting structural moieties: electron-transporting moieties are diaryl-1,3,4-oxadizole (Oxa) groups and hole transport moieties carbazole (Cz), or triphenylamine (TPA) moieties. The compounds formed amorphous glassy films when vacuum deposited and their glass transition temperature (T-g) was close to or higher than 150 degrees C. Their electronic structures (the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), and E-g values) and hole and electron mobilities in the compounds were studied. A couple of compounds bearing oxadiazole moieties revealed the electron mobility greater than 1.0 x 10(-4) cm(2)/(V s) at the electric field of 7.5 x 10(5) V/cm. The single layer light-emitting electroluminescence (EL) devices show that the external quantum efficiencies of the devices fabricated with those compounds having balanced carrier mobilities are much higher than those of the compounds composed of predominantly hole- or electron-transporting moieties. (c) 2005 Elsevier B.V. All rights reserved.