title: Photoluminescence and electroluminescence of cationic PtAu2heterotrinuclear complexes with aromatic acetylides.
abstract: Cationic PtAu2heterotrinuclear complexes [PtAu2(dpmp)2(C[triple bond, length as m-dash]CR)2]2+(dpmp = bis(diphenylphosphinomethyl)phenylphosphine, R = aryl) of aromatic acetylides were prepared. The PtAu2structures are supported through doubly bridging dpmp and stabilized by a significant Pt-Au interaction. They are highly phosphorescent in fluid CH2Cl2solution (Φem= 23.5%-78.9%), the solid state (Φem= 15.4%-70.2%), the PMMA film (Φem= 39.9%-71.7%) and the doping film of 61% TCTA : 31% OXD-7 : 8% PtAu2complex (Φem= 16.9%-67.9%). The phosphorescence arises mainly from3[π (C[triple bond, length as m-dash]CR) → π* (dpmp)]3LLCT and3[π (C[triple bond, length as m-dash]CR) → s/p (PtAu2)]3LMCT triplet excited states for carbazole-acetylide complexes, whereas other complexes display a3LLCT character mixed with noticeable PtAu2centered3[d → s/p] parentage. Utilizing a mixed host composed of hole-transporting TCTA and electron-transporting OXD-7 doped with 8% PtAu2species as a light-emitting layer and CuSCN as a hole-transporting layer through an orthogonal solution process, the devices exhibit highly efficient electrophosphorescence with the highest current efficiency (CEmax) of 51.7 cd A-1and external quantum efficiency (EQEmax) of 14.5%. The efficiency roll-off is small in the practical brightness range of 500-5000 cd m-2. The PtAu2complexes with carbazole-acetylides display a higher electroluminescence efficiency ascribed to their better hole-transporting character as well as more facile energy transfer from mixed host materials.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czn@fjirsm.ac.cn.
authors.forename: Li-Yi
authors.initials: LY
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czn@fjirsm.ac.cn.
authors.forename: Liang-Jin
authors.initials: LJ
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czn@fjirsm.ac.cn.
authors.forename: Jin-Yun
authors.initials: JY
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czn@fjirsm.ac.cn.
authors.forename: Xian-Chong
authors.initials: XC
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czn@fjirsm.ac.cn.
authors.forename: Zhong-Ning
authors.identifier: http://orcid.org/0000-0003-3589-3745
authors.initials: ZN
authors.lastname: Chen