Zhao Zhenwei, Liu Xiaoqing, Dai Wenbo, Liu Shengdi, Liu Miaochang, Wu Huayue, Huang Xiaobo, Lei Yunxiang
School of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China.
J Phys Chem Lett. 2024 Aug 8;15(31):8093-8100. doi: 10.1021/acs.jpclett.4c01786. Epub 2024 Aug 1.
Although the host-guest doped strategy effectively improves the phosphorescence performance of materials and greatly enriches the variety of materials, most of the guests are organic molecules with weak luminescence ability, which leads to the need for further improvement in the phosphorescence performance of doped materials. Herein, by salinization of organic molecules, the luminescence performance of the guests was effectively improved, thereby significantly enhancing the phosphorescence performance of the doped system. A compound 4-(naphthalen-2-yl)quinoline () containing nitrogen atom was synthesized as initial guest, then was salted to obtain six organic salt guests containing anions BF, PF, CFSO, N(CFSO), ClO, and CFSO, respectively. Two doped systems were constructed using benzophenone and poly(methyl methacrylate) as the hosts. The phosphorescence quantum yield and phosphorescence lifetime of doped materials with as guest were only 4.1%/5.2% and 131 ms/141 ms, while those of doped materials with salinized molecules as guests were improved to 32-39% and 534-625 ms, respectively. The single-crystal structures and theoretical calculations indicated that anions can not only enhance the intermolecular interaction of guests but also increase the spin-orbit coupling constant. This work provides an effective strategy for improving the phosphorescence performance of doped materials.
尽管主客体掺杂策略有效地提高了材料的磷光性能并极大地丰富了材料的种类，但大多数客体是发光能力较弱的有机分子，这导致掺杂材料的磷光性能仍需进一步提高。在此，通过有机分子的盐化，有效地提高了客体的发光性能，从而显著增强了掺杂体系的磷光性能。合成了一种含氮原子的化合物4-(萘-2-基)喹啉()作为初始客体，然后将其盐化，分别得到六种含有阴离子BF、PF、CFSO、N(CFSO)、ClO和CFSO的有机盐客体。以二苯甲酮和聚甲基丙烯酸甲酯为主体制备了两种掺杂体系。以 为客体的掺杂材料的磷光量子产率和磷光寿命分别仅为4.1%/5.2%和131 ms/141 ms，而以盐化分子为客体的掺杂材料的磷光量子产率和磷光寿命分别提高到32 - 39%和534 - 625 ms。单晶结构和理论计算表明，阴离子不仅可以增强客体分子间的相互作用，还可以增加自旋轨道耦合常数。这项工作为提高掺杂材料的磷光性能提供了一种有效的策略。
