title: Phosphorescent Iridium(III) Complexes Bearing Fluorinated Aromatic Sulfonyl Group with Nearly Unity Phosphorescent Quantum Yields and Outstanding Electroluminescent Properties.
abstract: A series of heteroleptic functional Ir(III) complexes bearing different fluorinated aromatic sulfonyl groups has been synthesized. Their photophysical features, electrochemical behaviors, and electroluminescent (EL) properties have been characterized in detail. These complexes emit intense yellow phosphorescence with exceptionally high quantum yields (ΦP > 0.9) at room temperature, and the emission maxima of these complexes can be finely tuned depending upon the number of the fluorine substituents on the pendant phenyl ring of the sulfonyl group. Furthermore, the electrochemical properties and electron injection/transporting (EI/ET) abilities of these Ir(III) phosphors can also be effectively tuned by the fluorinated aromatic sulfonyl group to furnish some desired characters for enhancing the EL performance. Hence, the maximum luminance efficiency (ηL) of 81.2 cd A(-1), corresponding to power efficiency (ηP) of 64.5 lm W(-1) and external quantum efficiency (ηext) of 19.3%, has been achieved, indicating the great potential of these novel phosphors in the field of organic light-emitting diodes (OLEDs). Furthermore, a clear picture has been drawn for the relationship between their optoelectronic properties and chemical structures. These results should provide important information for developing highly efficient phosphors.
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an, 710049, People's Republic of China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yu
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Yang
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Yan
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Huiming
authors.initials: H
authors.lastname: Zhang
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Xianbin
authors.initials: X
authors.lastname: Xu
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Guijiang
authors.initials: G
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an, 710049, People's Republic of China.
authors.forename: Zhaoxin
authors.initials: Z
authors.lastname: Wu
authors.affiliation: MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Institute of Chemistry for New Energy Material, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Yixia
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University , Hong Kong, People's Republic of China.|HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park , Shenzhen, 518057, People's Republic of China.
authors.forename: Wai-Yeung
authors.initials: WY
authors.lastname: Wong
keywords: OLEDs; electron injection/transporting; fluorination; functionalization; iridium complexes; sulfonyl group