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Introducing Bluish-Green Light-Emitting Diodes (OLEDs) and Tuning Their Color Intensity by Uranium Complexes: Synthesis, Characterization, and Photoluminescence Studies of 8-Hydroxyquinoline Complexes of Uranium
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-11-24 , DOI: 10.1021/acs.inorgchem.0c02242
Khodabakhsh Darzinezhad 1 , Mostafa M. Amini 1 , Mohammad Janghouri 2 , Ezeddin Mohajerani 3 , Mohammad-Reza Fathollahi 3 , Zahra Jamshidi 4 , Christoph Janiak 5
Affiliation  

To improve our understanding of the chemistry of actinide complexes and to spur their development in the field of actinide markers, two new uranium complexes were synthesized using 8-hydroxyquinoline and 5,7-dichloro-8-hydroxyquinoline. The prepared complexes were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, ultraviolet–visible spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The impact of the electron-withdrawing group of the ligand on the photoluminescence spectra of the complexes in solution and in the solid state was scrutinized. The bandgap of the complexes was calculated using the density functional theory (DFT) method to investigate the effects of the electron-withdrawing groups on energy levels. The synthesized uranium complexes demonstrated appropriate levels of the lowest unoccupied molecular orbital energy, leading to favorable dye stability. The prepared uranium complexes showed blue fluorescent emission, and the sample with the most intense fluorescence was used to construct bluish-green organic light-emitting diodes using simple solution processing fabrication methods. Absorbance spectra, emission spectra, DFT-calculated energy levels, and comparisons of the fabricated organic light-emitting diodes indicated that the electron-withdrawing group was a key factor in photoluminescence behavior.

中文翻译:

引入蓝绿色发光二极管(OLED)并通过铀配合物调节其颜色强度:铀的8-羟基喹啉配合物的合成,表征和光致发光研究

为了增进我们对of系元素配合物化学的理解并促进其在of系元素标记领域的发展,使用8-羟基喹啉和5,7-二氯-8-羟基喹啉合成了两种新的铀配合物。通过傅立叶变换红外光谱,热重分析,紫外可见光谱,元素分析和单晶X射线衍射对所制备的配合物进行表征。仔细研究了配体的吸电子基团对溶液和固态配合物的光致发光光谱的影响。使用密度泛函理论(DFT)方法计算配合物的带隙,以研究吸电子基团对能级的影响。合成的铀络合物表现出最低的未占据分子轨道能的适当水平,从而导致有利的染料稳定性。制备的铀配合物显示蓝色荧光发射,并且使用最简单的溶液处理制造方法,将荧光强度最高的样品用于构建蓝绿色有机发光二极管。吸收光谱,发射光谱,DFT计算的能级以及所制造的有机发光二极管的比较表明,吸电子基团是光致发光行为的关键因素。荧光强度最高的样品通过简单的溶液加工制造方法用于构建蓝绿色有机发光二极管。吸收光谱,发射光谱,DFT计算的能级以及所制造的有机发光二极管的比较表明,吸电子基团是光致发光行为的关键因素。荧光强度最高的样品通过简单的溶液加工制造方法用于构建蓝绿色有机发光二极管。吸收光谱,发射光谱,DFT计算的能级以及所制造的有机发光二极管的比较表明,吸电子基团是光致发光行为的关键因素。
更新日期:2020-12-07
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