From Mononuclear to Dinuclear Iridium(III) Complex: Effective Tuning of the Optoelectronic Characteristics for Organic Light-Emitting Diodes
From Mononuclear to Dinuclear Iridium(III) Complex: Effective Tuning of the Optoelectronic Characteristics for Organic Light-Emitting Diodes
复制标题
从单核到双核铱(III)配合物：有效调节有机发光二极管的光电特性
DOI：
10.1021/acs.inorgchem.5b02625
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发表时间：
2016
影响因子：
4.6
通讯作者：
Wai-Yeung Wong
中科院分区：
文献类型：
--
作者：
Xiaolong Yang;Xianbin Xu;Jing-shuang Dang;Guijiang Zhou;Cheuk-Lam Ho;Wai-Yeung Wong
能够表现出高发光效率和良好电致发光能力的磷光双核铱(III)配合物非常罕见。在本文中，合成了基于2-苯基嘧啶的高磷光双核铱(III)配合物并对其进行了充分表征。观察到单核配合物和双核配合物之间的光物理和电化学性质的显着差异。理论计算结果表明，双核配合物采用独特的分子轨道空间分布模式，这对其光物理和电化学性质起着关键作用。更重要的是，基于新型双核铱（III）配合物的溶液加工有机发光二极管（OLED）实现了14.4%的峰值外量子效率（ηext），这是使用双核铱（III）配合物作为发射极的OLED的最高ηext。此外，基于双核铱(III)络合物的OLED的效率远高于基于相应单核铱(III)络合物的OLED的效率。
Phosphorescent dinuclear iridium(III) complexes that can show high luminescent efficiencies and good electroluminescent abilities are very rare. In this paper, highly phosphorescent 2-phenylpyrimidine-based dinuclear iridium(III) complexes have been synthesized and fully characterized. Significant differences of the photophysical and electrochemical properties between the mono- and dinuclear complexes are observed. The theoretical calculation results show that the dinuclear complexes adopt a unique molecular orbital spatial distribution pattern, which plays the key role of determining their photophysical and electrochemical properties. More importantly, the solution-processed organic light-emitting diode (OLED) based on the new dinuclear iridium(III) complex achieves a peak external quantum efficiency (ηext) of 14.4%, which is the highest ηextfor OLEDs using dinuclear iridium(III) complexes as emitters. Besides, the efficiencies of the OLED based on the dinuclear iridium(III) complex are much higher that those of the OLED based on the corresponding mononuclear iridium(III) complex.