Green-emitting phosphorescent iridium(III) complex: Structural, photophysical and electrochemical properties

Thamilarasan, Vijayan; Jayamani, Arumugam; Manisankar, P.; Kim, Young-Inn; Sengottuvelan, Nallathambi

doi:10.1016/j.ica.2013.08.005

Cited by 17 publications

(7 citation statements)

References 36 publications

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“…Photoactive iridium complexes containing a six -membered cyclometalating chelate are very rare, and the few reported examples can be categorized into two families of complexes: those containing conjugated 18−21 or nonconjugated 22−24 bidentate cyclometalating ligands. For instance, in 2008, Song et al.…”

Section: Introductionmentioning

confidence: 99%

“…Nearly all of the photoactive iridium(III) complexes that are used as emitters in electroluminescent devices, − as dyes in solar cells, − in nonlinear optics (NLO), − as photoredox catalysts, , as solar fuels, and in bioimaging , contain conjugated five-membered chelated ligands, such as the commonly used 2-phenylpyridine (ppyH), 2,2′-bipyridine (bpy), acetylacetonate (acac), and picolinate (pic). Photoactive iridium complexes containing a six -membered cyclometalating chelate are very rare, and the few reported examples can be categorized into two families of complexes: those containing conjugated − or nonconjugated − bidentate cyclometalating ligands. For instance, in 2008, Song et al .…”

Section: Introductionmentioning

confidence: 99%

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An Unprecedented Family of Luminescent Iridium(III) Complexes Bearing a Six-Membered Chelated Tridentate C^N^C Ligand

et al. 2017

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A new family consisting of three luminescent neutral Ir(III) complexes with the unprecedented [Ir(C^N^C)(N^N)Cl] architecture, where C^N^C is a bis(six-membered) chelating tridentate tripod ligand derived from 2-benzhydrylpyridine (bnpy) and N^N is 4,4′-di-tert-butyl-2,2′-bipyridine (dtBubpy), is reported. X-ray crystallography reveals an unexpected and unusual double C–H bond activation of the two distal nonconjugated phenyl rings of the bnpy coupled with a very short Ir–Cl bond trans to the pyridine of the bnpy ligand. Depending on the substitution on the bnpy ligand, phosphorescence, ranging from yellow to red, is observed in dichloromethane solution. A combined study using density functional theory (DFT) and time-dependent DFT (TD-DFT) corroborates the mixed charge-transfer nature of the related excited states.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Unprecedented Family of Luminescent Iridium(III) Complexes Bearing a Six-Membered Chelated Tridentate C^N^C Ligand

et al. 2017

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“…27 Other groups have also demonstrated different design strategies and color tunability for blue phosphorescent Ir complexes, rendering decent device efficiencies. [46][47][48][49][50][51][52][53][54][55][56][57][58][59] For instance, several studies have indicated that the emission properties of blue-emitting Ir complexes are harnessed not only by the cyclometalating ligands but also by the ancillary ligands. [54][55][56][57][58][59] With the aim of obtaining bluer emission, we thus adopted strong-field ancillary CF 3 -containing pyridine-azole ligands, such as 2-(3-(trifluoromethyl)-1H-pyrazol-5-yl)pyridine 32 and 2-(3,5-bis(trifluoromethyl)-1H-pyrrol-2-yl)pyridine, 33 to make the compounds MS 17 and MS 19 (Scheme 1), respectively.…”

Section: Resultsmentioning

confidence: 99%

Anomalously Long-Lasting Blue PhOLED Featuring Phenyl-Pyrimidine Cyclometalated Iridium Emitter

Sarma

Tsai

Lee

et al. 2017

Chem

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Blue phosphorescent material with both high efficiency and long durability is a long-standing challenge in the field of organic light-emitting devices (OLEDs). This work describes an anomalously blue phosphorescent OLED featuring the phenylpyrimidine cyclometalated iridium emitter, which has nearly unitary emission quantum yield, strong horizontal emitting dipole orientation, and short excitedstate lifetime to ensure high electroluminescence efficiency and a long device operation lifetime of T 50 > 2,200 hr.

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“…Since carbazole is a relatively inexpensive material with unique properties such as high hole-transporting mobility [25,26], pronounced thermal stability [2] and high fluorescent quantum yields [27,28] our attention was focused on carbazole derivatives [29]. In addition to that, carbazole is a rigid aromatic molecule [30] with many different modification sites for multifunctionalisation [31,32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel multifunctional carbazole based molecules and their thermal, electrochemical and optical properties

Altınölçek¹,

Battal²,

Tavaslı³

et al. 2020

Preprint

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Two novel carbazole-based compounds 7a and 7b were synthesised as potential candidates for application in organic electronics. The materials were fully characterised by NMR spectroscopy, mass spectrometry, FT-IR, thermogravimetric analysis, differential scanning calorimetry, cyclic voltammetry, and absorption and emission spectroscopy. Compounds 7a and 7b, both of which were amorphous solids, were stable up to 291oC and 307oC, respectively. Compounds 7a and 7b show three distinctive absorption bands: high and mid energy bands due to locally excited (LE) transitions and low energy bands due to intramolecular charge transfer (ICT) transitions. In dichloromethane solutions compounds 7a and 7b gave emission maxima at 561 nm and 482 nm with quantum efficiencies of 5.4% and 97.4% ± 10%, respectively. At positive potential, compounds 7a and 7b gave two different oxidation peaks, respectively: quasi-reversible at 0.55 V and 0.71 V, and reversible at 0.84 V and 0.99 V. At negative potentials, compounds 7a and 7b only exhibited an irreversible reduction peak at -1.86 V and -1.93 V, respectively.

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Green-emitting phosphorescent iridium(III) complex: Structural, photophysical and electrochemical properties

Cited by 17 publications

References 36 publications

An Unprecedented Family of Luminescent Iridium(III) Complexes Bearing a Six-Membered Chelated Tridentate C^N^C Ligand

An Unprecedented Family of Luminescent Iridium(III) Complexes Bearing a Six-Membered Chelated Tridentate C^N^C Ligand

Anomalously Long-Lasting Blue PhOLED Featuring Phenyl-Pyrimidine Cyclometalated Iridium Emitter

Synthesis of novel multifunctional carbazole based molecules and their thermal, electrochemical and optical properties

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