Wang Quan, Sui Ning, Gao Xiujun, Chi Xiaochun, Pan Lingyun, Lu Ran, Zhang Hanzhuang, Kang Zhihui, Zhao Bing, Wang Yinghui
Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, P. R. China.
College of Chemistry, Jilin University, Changchun 130012, P. R. China.
J Phys Chem B. 2021 Apr 29;125(16):4132-4140. doi: 10.1021/acs.jpcb.1c00655. Epub 2021 Apr 14.
A comparative investigation on the photophysical properties of a quinoxaline derivative 4,4'-((1,1')-quinoxaline-2,3-diylbis(ethene-2,1-diyl))bis(,-dimethylaniline) (QDMA2) was performed by employing many spectroscopies. Based on the pump-dump/push-probe measurement, it is found that a solvent-stabilized charge-transfer state can participate in the relaxation of excited QDMA2 with increasing solvent polarity. Meanwhile, the aggregated QDMA2 molecules were engineered into the organic light-emitting diode test, which showed a correlated color temperature value of 1875 K. With the help of a diamond anvil cell, the pressure-dependent photoluminescence of aggregated QDMA2 shows that the intermolecular interaction can affect the color and intensity of photoluminescence through adjusting the band gap and irradiative channel of the aggregated molecules. These results are important for understanding the structure-property relationships and the rational design of functional materials for optoelectronic applications.
通过多种光谱技术对喹喔啉衍生物4,4'-((1,1')-喹喔啉-2,3-二亚基双(乙烯-2,1-二亚基))双( -二甲基苯胺)(QDMA2)的光物理性质进行了对比研究。基于泵浦-卸载/推挽-探针测量，发现随着溶剂极性的增加，溶剂稳定的电荷转移态可以参与激发态QDMA2的弛豫过程。同时，将聚集的QDMA2分子应用于有机发光二极管测试，其相关色温值为1875 K。借助金刚石对顶砧池，聚集的QDMA2的压力依赖光致发光表明，分子间相互作用可通过调节聚集分子的带隙和辐射通道来影响光致发光的颜色和强度。这些结果对于理解结构-性质关系以及合理设计用于光电子应用的功能材料具有重要意义。
