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Red Phosphorescent Bis‐Cyclometalated Iridium Complexes with Fluorine‐, Phenyl‐, and Fluorophenyl‐Substituted 2‐Arylquinoline Ligands
Author(s) -
Kim Jwajin,
Lee Kum Hee,
Lee Seok Jae,
Lee Ho Won,
Kim Young Kwan,
Kim Young Sik,
Yoon Seung Soo
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504392
Subject(s) - iridium , phosphorescence , triphenylamine , quantum efficiency , chemistry , tris , luminous efficacy , lithium (medication) , biphenyl , fluorine , photochemistry , materials science , fluorescence , organic chemistry , optoelectronics , catalysis , layer (electronics) , medicine , quantum mechanics , endocrinology , biochemistry , physics
Red phosphorescent iridium(III) complexes based on fluorine‐, phenyl‐, and fluorophenyl‐substituted 2‐arylquinoline ligands were designed and synthesized. To investigate their electrophosphorescent properties, devices were fabricated with the following structure: indium tin oxide (ITO)/4,4′,4′′‐tris[2‐naphthyl(phenyl)amino]triphenylamine (2‐TNATA)/4,4′‐bis[ N ‐(1‐naphthyl)‐ N ‐phenylamino]biphenyl (NPB)/4,4′‐bis( N ‐carbazolyl)‐1,1′‐biphenyl (CBP): 8 % iridium (III) complexes/bathocuproine (BCP)/tris(8‐hydroxyquinolinato)aluminum (Alq 3 )/8‐hydroxyquinoline lithium (Liq)/Al. All devices, which use these materials showed efficient red emissions. In particular, a device exhibited a saturated red emission with a maximum luminance, external quantum efficiency, and luminous efficiency of 14200 cd m −2 , 8.44 %, and 6.58 cd A −1 at 20 mA cm −2 , respectively. The CIE ( x , y ) coordinates of this device are (0.67, 0.33) at 12.0 V.