3 years ago

Synthesis and electroluminescent property of highly efficient phosphorescent red dopants based on modulated main ligands

Young Kwan Kim, Ye Na Oh, Song Eun Lee, Dong Myung Shin, Seo Yun Lee

Novel red phosphorescent iridium(III) complexes, (DPAP-MQ)2Ir(tmd), (DMAP-MQ)2Ir(tmd), (PN-MQ)2Ir(tmd) were synthesized for red emitter of the phosphorescent organic light-emitting diodes (phOLEDs). The ligands have sites of both the electron donor and acceptor in a molecule. The main ligands consisted of electron-donors ((dimethylamino)phenyl, (diphenylamino)phenyl, (dimethylamino)naphthalene) and electron-acceptor methyl quinoline were synthesized by suzuki coupling reaction. The iridium(III) complexes based on main ligands and 2,2,6,6-tetramethyl-3,5-heptanedione(tmd) ancillary ligand were synthesized by Nonoyama reaction. Their luminescence property was investigated by UV-visible spectroscopy and photoluminescence (PL) spectroscopy. The manufactured PHOLEDs were characterized by investigation of current density-voltage-luminance, luminance efficiency, external quantum efficiency, electroluminescence spectrum. These phosphorescent iridium complexes will be promising candidates for highly efficient red emitters.

Publisher URL: http://www.tandfonline.com/doi/full/10.1080/15421406.2017.1350041

DOI: 10.1080/15421406.2017.1350041

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