Bis-Tridentate Iridium(III) Phosphors Bearing Functional 2-Phenyl-6-(imidazol-2-ylidene)pyridine and 2-(Pyrazol-3-yl)-6-phenylpyridine Chelates for Efficient OLEDs

Abstract

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. (6) was made when the 'one-pot' reaction of (phpyim- -3 -H TOC illustrationCyan-to red-emitting Ir(III) metal complexes comprising the bis-tridentate architecture, i.e. with both 2-(2,4-difluorophenyl)-6-(3-isopropyl-imidazol-2-ylidene)pyridine and functional 2-pyrazol-3-yl-6-phenylpyridine, were found to be useful for the fabrication of efficient OLEDs.

Metal Complexes with Azolate‐Functionalized Multidentate Ligands: Tactical Designs and Optoelectronic Applications

“…[69] Efficient OLEDs were fabricated using simplified architectures, which has not only confirmed the feasibility of the approach, but also laid as olid foundation for future improvement of their performances. Indeed, the successful inclusion of both phpyim and the dianionic chelates around the Ir III metal center have led to the isolation of correspondingb is-tridentate Ir III complexes (74-76)w ith emission colors ranging from cyan (74), green (75), to red-orange (76).…”

“…Indeed, the successful inclusion of both phpyim and the dianionic chelates around the Ir III metal center have led to the isolation of correspondingb is-tridentate Ir III complexes (74-76)w ith emission colors ranging from cyan (74), green (75), to red-orange (76). [69] Efficient OLEDs were fabricated using simplified architectures, which has not only confirmed the feasibility of the approach, but also laid as olid foundation for future improvement of their performances. Ta ble3 depicts the basic photophysical data of these bis-tridentate Ir III complexes.…”

“…Chi and co‐workers have also prepared a third class of bis‐tridentate Ir III metal complexes using the monoanionic tridentate chelate ph 2F pyim, that is, 4‐( tert ‐butyl)‐2‐(2,4‐difluorophenyl)‐6‐(3‐isopropylimidazol‐2‐ylidene)pyridine from pro‐chelate [ph 2F pyimH][PF 6 ], together with selected dianionic tridentate chelates with identical 2‐pyrazol‐3‐yl‐6‐phenylpyridine core skeletons, that is, 2‐(5‐trifluoromethyl‐1 H ‐pyrazol‐3‐yl)‐6‐(4‐fluorophenyl)pyridine (pz CF3 pyph F H 2 ), 2‐(5‐trifluoromethyl‐1 H ‐pyrazol‐3‐yl)‐6‐(4‐trifluoromethylphenyl)pyridine (pz CF3 pyph CF3 H 2 ) and 1‐phenyl‐3‐(5‐trifluoromethyl‐1 H ‐pyrazol‐3‐yl)isoquinoline (pz CF3 iq′phH 2 ). Indeed, the successful inclusion of both phpyim and the dianionic chelates around the Ir III metal center have led to the isolation of corresponding bis‐tridentate Ir III complexes ( 74 – 76 ) with emission colors ranging from cyan ( 74 ), green ( 75 ), to red‐orange ( 76 ) . Efficient OLEDs were fabricated using simplified architectures, which has not only confirmed the feasibility of the approach, but also laid a solid foundation for future improvement of their performances.…”

Role of the Diphosphine Chelate in Emissive, Charge‐Neutral Iridium(III) Complexes

“…The oscillator strengths ( f ) from S 0 →T n transitions could not be calculated with current TD‐DFT methods. The predicted S 0 ←T 1 emission wavelengths were converted from the TD‐DFT absorption wavelengths of S 0 →T 1 on the optimized S 0 geometries by using an energy scaling factor of 0.94 to take into account the expected constant Stokes shift in the Ir III complexes . Simple scaling factors have been used in many other computational studies to compare with experimental data especially for infrared and NMR chemical shift data.…”

Luminescent Ir(III) complexes bearing benzothiazole or benzoxazole-based pincer ligand

“…Williams and Haga independently developed Ir complexes bearing NCN pincer ligands [7][8][9][10][11][12][13][14], although bidentate ligands such as 2-phenylpyridine and 2-phenylbenzothiazole were typically used as cyclometalating ligands for emissive Ir complexes [15][16][17]. Owing to their high thermal stability and emission quantum efficiency [18][19][20], pincer Ir complexes are expected to be used as an emissive material for organic light emitting diodes (OLEDs) [21][22][23][24][25]. We previously reported an Ir(III) complex bearing a benzothiazole-based NCN pincer ligand (Complex 1, Fig.…”