Simple molecular structure design of iridium(III) complexes: Achieving highly efficient non-doped devices with low efficiency roll-off
Simple molecular structure design of iridium(III) complexes: Achieving highly efficient non-doped devices with low efficiency roll-off
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铱（III）配合物的简单分子结构设计：实现低效率滚降的高效非掺杂器件
DOI：
10.1016/j.orgel.2016.05.002
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发表时间：
2016-08
影响因子：
3.2
通讯作者：
Zhong-Min Su
中科院分区：
文献类型：
--
作者：
Guo-Gang Shan;Kai-Yue Zhao;Wen-Fa Xie;Zhong-Min Su
为了构建适用于非掺杂器件的高效发光体并深入理解结构与性能之间的关系，我们设计并合成了两种基于1，2-二苯基-1H-苯并咪唑（PBI）配体的杂配型铱（III）配合物，其取代基从甲基（配合物2）到叔丁基（配合物3）简单变化。为了更好的比较，还提供了PBI配体上无取代基的母体配合物1。系统地研究了它们的光物理、电化学和电致发光（EL）性能。尽管它们的结构修改，所有的配合物表现出几乎相同的发射和激发态的字符，这是合理的量子化学计算。结果表明，以配合物3为发光层的非掺杂器件具有最高的电致发光性能，最大电流效率（ηc，max）为18.6 cd A− 1，功率效率（ηp，max）为16.2 lm W− 1，但效率衰减值较低，远高于配合物1和配合物2.研究结果表明，在PBI配体中引入简单取代基是开发高效非掺杂荧光粉的有效可行途径。
To construct efficient emitters suitable for non-doped devices and deeply understand the relationship between structures and performances, we designed and synthesized two heteroleptic iridium(III) complexes based on 1,2-diphenyl-1H-benzoimidazole (PBI) ligands whose substituents are varied simply from methyl (complex2) totert-butyl groups (complex3). The parent complex1with non-substituent on PBI ligand has also been presented for a better comparison. Their photophysical, electrochemical and electroluminescent (EL) performances are investigated systematically. Despite their structural modification, all complexes exhibit almost identical emission and excited-state characters, which are rationalized by the quantum-chemical calculations. However, the obvious differences on device performances are found. Non-doped device employing3as emitting layer displays the highest EL performance with maximum current efficiency (ηc, max) of 18.6 cd A−1and power efficiency (ηp, max) of 16.2 lm W−1accompanied by low efficiency roll-off values, which is much higher than those of complexes1and2. The obtained results herein suggest that introduction of the simple substituent into PBI ligand is an effective and feasible approach to develop highly efficient non-doped phosphors.
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