Qiao Lige, Kong Xiangjun, Li Kechun, Yuan Lequn, Shen Yunjun, Zhang Yuzhen, Zhou Liang
Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning, Guangxi, 530006, China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Adv Sci (Weinh). 2024 Sep;11(35):e2404621. doi: 10.1002/advs.202404621. Epub 2024 Jul 19.
Three dinuclear Pd(II) complexes (1, 2, and 3) with intense red phosphorescence at room temperature are here synthesized using strong ligand field strength compounds. All three complexes are characterized by nuclear magnetic resonance, high-resolution mass spectrometry, and elemental analyses. Complexes 2 and 3 are characterized by single-crystal X-ray diffraction. The crystalline data of 2 and 3 reveal complex double-layer structures, with Pd-Pd distances of 2.8690(9) Å and 2.8584(17) Å, respectively. Furthermore, complexes 1, 2, and 3 show phosphorescence at room temperature in their solid states at the wavelengths of 678, 601, and 672 nm, respectively. In addition, they show phosphorescence at 634, 635, and 582 nm, respectively, in the 2 wt.% (PMMA) films, and phosphorescence at 670, 675, and 589 nm, respectively, in the deoxygenated CHCl solutions. Among three complexes, complex 1 shows red emission at 634 nm with phosphorescent quantum yield Ф = 67% in the 2 wt.% PMMA film. Furthermore, complex 1-based organic light-emitting diode is fabricated using a vapor-phase deposition process, and their maximum external quantum efficiency reaches 20.52%, which is the highest percentage obtained by using the dinuclear Pd(II) complex triplet emitters with the CIE coordinates of (0.62, 0.38).
本文使用强配体场强度化合物合成了三种在室温下具有强烈红色磷光的双核钯（II）配合物（1、2和3）。所有三种配合物均通过核磁共振、高分辨率质谱和元素分析进行表征。配合物2和3通过单晶X射线衍射进行表征。2和3的晶体数据揭示了复杂的双层结构，钯-钯距离分别为2.8690(9) Å和2.8584(17) Å。此外，配合物1、2和3在室温下的固态中分别在678、601和672 nm波长处显示磷光。此外，它们在2 wt.%（聚甲基丙烯酸甲酯）薄膜中分别在634、635和582 nm处显示磷光，在脱氧氯仿溶液中分别在670、675和589 nm处显示磷光。在三种配合物中，配合物1在2 wt.%聚甲基丙烯酸甲酯薄膜中在634 nm处显示红色发射，磷光量子产率Ф = 67%。此外，基于配合物1的有机发光二极管采用气相沉积工艺制备，其最大外量子效率达到20.52%，这是使用具有（0.62, 0.38）CIE坐标的双核钯（II）配合物三线态发射体获得的最高百分比。
