title: Synthesis, optoelectronic properties of a dinuclear platinum(II) complex containing a binary cyclometalated ligand in the single-emissive-layer PLEDs.
abstract: A novel dinuclear platinum complex of (dfppy-mhb-dfppy)Pt(2)(acac)(2) was synthesized and characterized, where dfppy-mhb-dfppy is a binary C^N cyclometalated ligand containing two bridged 2,4-difluorophenylpyridine (dfppy) units and acac is 2,4-pentanedione anion. Compared to previously reported dinuclear platinum complexes with a binary ancillary ligand, this dinuclear platinum complex showed more intense excimer emission, peaking at 617 nm, besides its intrinsic emission in dilute dichloromethane solution. Single-emissive-layer (SEL) polymer light-emitting devices (PLEDs) using (dfppy-mhb-dfppy)Pt(2)(acac)(2) as dopant and a blend of poly (N-vinylcarbazole) (PVK) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as host matrix exhibited stable white emission at 1 wt% doping concentration under applied voltages from 7 V to 11 V. The stable white emission observed in the (dfppy-mhb-dfppy)Pt(2)(acac)(2)-doped SEL PLEDs indeed implies that the dinuclear platinum complex constructed by a binary cyclometalated ligand has a potential application in white-emitting SEL PLEDs.
authors.affiliation: College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Luo
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.forename: Danyan
authors.initials: D
authors.lastname: Shi
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.forename: Junting
authors.initials: J
authors.lastname: Yu
authors.forename: Yafei
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Gangtie
authors.initials: G
authors.lastname: Lei
authors.forename: Weiguo
authors.initials: W
authors.lastname: Zhu