title: Photo- and electro-luminescence of four cuprous complexes with sterically demanding and hole transmitting diimine ligands.
abstract: Four new cuprous complexes (1-4) containing bisphosphine and triazolylpyridine donors have been prepared in order to examine the effects of the methyl group and the carbazole appendage on photo- and electro-luminescence (PL and EL) properties. Because of their additional steric hindrance from the methyl substituent group at a 6-pyridine ring, complexes 3 and 4, compared with the methyl group free compounds 1 and 2, expectedly exhibit largely spectral blue shift and higher intensity both in PL and EL. Meanwhile, the carbazole appendage of complexes 2 and 4 does not significantly alter their PL performance in comparison with 1 and 3, respectively, but have a modest increase in their EL efficiency in multilayer organic light-emitting diodes (OLEDs). Moreover, the OLED with 4 as the light emitting material has the highest current efficiency (CEmax) of 27.2 cd A(-1) and the maximum external quantum efficiency (EQEmax) of 8.7%.
authors.affiliation: Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czlu@fjirsm.ac.cn.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Xu-Lin
authors.initials: XL
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Xiao-Yuan
authors.initials: XY
authors.lastname: Wu
authors.forename: Rongmin
authors.initials: R
authors.lastname: Yu
authors.forename: Can-Zhong
authors.initials: CZ
authors.lastname: Lu
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D011725:Pyridines / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D007097:Imines; D008024:Ligands; D011725:Pyridines; D003300:Copper