Tuning the Energy Level and Photophysical and Electroluminescent Properties of Heavy Metal Complexes by Controlling the Ligation of the Metal with the Carbon of the Carbazole Unit
Tuning the Energy Level and Photophysical and Electroluminescent Properties of Heavy Metal Complexes by Controlling the Ligation of the Metal with the Carbon of the Carbazole Unit
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DOI：
10.1002/adfm.200600663
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发表时间：
2007-03
影响因子：
19
通讯作者：
Chuluo Yang;Xiaowei Zhang;Han You;Lingyun Zhu;Lianqing Chen;Linna Zhu;Y. Tao;Dongge Ma;
中科院分区：
文献类型：
--
作者：
Chuluo Yang;Xiaowei Zhang;Han You;Lingyun Zhu;Lianqing Chen;Linna Zhu;Y. Tao;Dongge Ma;
制备了四种新颖的IrIII和PtII与环化配体的咔唑框架配合物，并通过元素分析，NMR光谱和质谱进行了表征。配合物1、3和4的单晶X射线衍射研究表明，咔唑单元的3-或2-位C原子与金属中心配位。连接位置的差异导致发射光谱的显著偏移，其中波长的变化对于Ir络合物为84 nm，对于Pt络合物为63 nm。研究了配合物的电化学行为和电子物理性质，并与密度泛函理论（DFT）计算结果进行了相关。采用ITO/NPB/CBP：掺杂剂/BCP/AlQ_3/LiF/Al结构的电致发光器件可以获得非常高的效率。
Four novel IrIII and PtII complexes with cyclometalated ligands bearing a carbazole framework are prepared and characterized by elemental analysis, NMR spectroscopy, and mass spectrometry. Single‐crystal X‐ray diffraction studies of complexes 1, 3, and 4 reveal that the 3‐ or 2‐position C atom of the carbazole unit coordinates to the metal center. The difference in the ligation position results in significant shifts in the emission spectra with the changes in wavelength being 84 nm for the Ir complexes and 63 nm for the Pt complexes. The electrochemical behavior and photophysical properties of the complexes are investigated, and correlate well with the results of density functional theory (DFT) calculations. Electroluminescent devices with a configuration of ITO/NPB/CBP:dopant/BCP/AlQ3/LiF/Al can attain very high efficiencies.