Bis-ZnIIsalphen complexes bearing pyridyl functionalized ligands for efficient organic light-emitting diodes (OLEDs)

Jiang Zhao, Feifan Dang, Boao Liu, Yong Wu, Xiaolong Yang, Guijiang Zhou, Zhaoxin Wu, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


Inspired by the emissive features of ZnIIcomplexes based on bis-Schiff base ligands, bis-ZnIIsalphen complexes bearing pyridyl functionalized ligands have been successfully synthesized. Their photophysical features, electrochemical behavior and electroluminescent (EL) properties have been investigated in detail. The functionalized bis-ZnIIsalphen complexes can exhibit high thermal stability up to 417 °C, and their photoluminescence (PL) spectra show a maximal emission wavelength peak at ca. 565 nm both in solution and PMMA doped films. The PL investigation of the neat films for these functionalized bis-ZnIIsalphen complexes indicated that the pyridyl functionalized ligands can effectively reduce the degree of molecular aggregation to enhance their emission intensity. Taking advantage of the charge carrier injection/transporting ability of the pyridyl functionalized ligands and their dendritic design, the optimized EL devices fabricated by a simple solution-processing method can achieve a peak luminance (Lmax) of 3589 cd m-2, a maximal external quantum efficiency (ηext) of 1.46%, a maximal current efficiency (ηL) of 4.1 cd A-1and a maximal power efficiency (ηp) of 3.8 lm W-1. These results should afford important instructions for exploiting high performance fluorescent emitters based on dinuclear ZnIIcomplexes.
Original languageEnglish
Pages (from-to)6098-6110
Number of pages13
JournalDalton Transactions
Issue number18
Publication statusPublished - 1 Jan 2017

ASJC Scopus subject areas

  • Inorganic Chemistry


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