Synthesis, Characterization, and Electroluminescent Properties of Iridium(III) 2‐Phenylpyridine‐type Complexes Containing Trifluoromethyl Substituents and Various Main‐Group Moieties

Abstract

New heteroleptic cyclometalated iridium(III) 2‐phenylpyridine‐type complexes with trifluoromethyl substituents and various main‐group moieties were synthesized and their photophysical, electrochemical, and electroluminescent (EL) properties studied. The emission color can be tuned by a facile derivatization of the phenyl moiety of 2‐phenylpyridine with various main‐group moieties, and we have prepared new yellowishgreen to orange triplet emitters with enhanced charge injection/charge transporting features, which can furnish attractive EL performance in phosphorescent organic light‐emitting devices (OLEDs). Attempts were also made to fabricate two‐color white‐light OLEDs based on a combination of fluorescent blue and phosphorescent orange emitters.

Structural Mimics of Phenyl Pyridine (ppy) – Substituted, Phosphorescent Cyclometalated Homo and Heteroleptic Iridium(III) Complexes for Organic Light Emitting Diodes – An Overview

“…C. L. Ho, et al ., reported a series of Ir(III) complexes (138–141, Figure )) with trifluoromethyl substituted ppy ligand . According to the obtained results they conclude that, the emission color can be tuned by a facile derivatization of the phenyl moiety of 2‐phenylpyridine with various main‐group moieties.…”

Crystal structure of 1-[3-(trifluoromethyl)cinnamoyl]-3-(pyridin-2-yl-κN)pyrazole-κ2 N-bis(2-phenylpyridinato-k2 C,N)iridium(III) hexafluorophosphate complex, [C40H28F3IrN5O]PF6

“…The archetypal Ir(III) phenylpyridine based complexes are widely employed in OLEDs and LEECs due to their high quantum yields, stability and facile colour tunability [15,16]. The photophysical properties of these Ir(III) complexes can be tuned by utilising different ancillary ligands [17,18] and also by employing various substituents on the phenylpyridine moieties and ancillary ligands [19,20]. The photophysical properties of Ir(III) phenylpyridine complex with pyridylpyrazole moieties as an ancillary ligand has been studied for LEECs application [21].…”

Unsymmetric Ir(iii) phosphorescent complexes with both 2-phenylpyridine(ppy)- and 2-vinylpyridine(vpy)-type ligands bearing functional groups and their optoelectronic properties

“…Owing to their tunable emission color, high phosphorescence quantum yield (F P ), ability to harness both singlet and triplet excitons and short excited-state lifetime, 2-phenylpyridine(ppy)type Ir(III) complexes have shown great potential for making highly efficient organic light-emitting diodes (OLEDs). [1][2][3][4][5][6][7][8] Critically, owing to their charge carrier injection/transport features, functionalized ligands of ppy-type Ir(III) complexes can further enhance their electroluminescence (EL) performance to furnish OLEDs with advanced EL performances. [9][10][11][12][13] Furthermore, functional groups with different charge carrier injection/transport features have been introduced into ppy-type ligands, conferring ambipolar ability to the ppy-type Ir(III) complexes, showing both hole and electron injection/transport character.…”