Sky-blue-emitting cationic iridium complexes with oxadiazole/triazine-type counter-anions and their use for efficient solution-processed organic light-emitting diodes

Bai, Rubing; Wang, Pei; Meng, Xianwen; He, Lei

doi:10.1016/j.dyepig.2020.108586

Cited by 7 publications

(2 citation statements)

References 58 publications

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“…The blue-green device incorporating complex 1 provided peak current-efficiency/external quantum efficiency (EQE) at 28.1 cd A −1 /10.2%, which are among the highest values for solution-processable double-layer OLEDs incorporating cationic Ir(III) complexes. 9,23,24,63 The device incorporating complex 1 showed a moderate roll-off of efficiency (Figure S7), with current efficiencies of 27.4/21.5 cd A −1 and efficiency roll-offs of 2.5%/23% at 1000/5000 cd m −2 . The efficiency roll-off should be correlated with triplet−polaron/ triplet−triplet quenching in the active layers.…”

Section: Introductionmentioning

confidence: 99%

“…These applications are based on their favorable properties, for example, ready preparation, easy adjustments on photophysical and redox properties, and high phosphorescence efficiency as well as sufficient solubility in medium-polar or polar solvents. In recent years, phosphorescent cationic Ir(III) complexes have been applied as emitting materials for solution-processable organic light-emitting diodes (OLEDs) ,− or for light-emitting electrochemical cells (LECs). ,,, With a low production cost and high performances, these devices can be potentially used for flat-panel displays or solid-state lighting.…”

Section: Introductionmentioning

confidence: 99%

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Cationic Ir(III) Complexes Featuring Phenylimidazole-type Cyclometalated Ligands: Fluorine-Free Blue Phosphorescent Emitters for Light-Emitting Devices

Song

Chen

et al. 2021

Inorg. Chem.

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The development of blue emissive cationic Ir(III) complexes with no fluorine substitutions but with sufficient blue color purity and high phosphorescence efficiency has remained challenging. Here, fluorine-free cyan to deep blue emissive cationic Ir(III) complexes with phenylimidazole-type cyclometalated ligands (C∧N) are reported, which are [Ir(dphim)2(dmapzpy)]PF6 (1), [Ir(ipr-dphim)2(dmapzpy)]PF6 (2), [Ir(ipr-dphim)2(bipz)]PF6 (3), and [Ir(ipr-dphim)2(bicb)]PF6 (4). 1,2-Diphenyl-1H-imidazole (dphim) and 1-(2,6-diisopropylphenyl)-2-phenyl-1H-imidazole (ipr-dphim) are the phenylimidazole-type C∧N ligands, and 4-dimethylamino-2-(1H-pyrazol-1-yl)pyridine (dmapzpy), di(1H-pyrazol-1-yl)methane (bipz), and 3,3′-methylenebis(1-methyl-1H-imidazol-3-ium-2-ide) (bicb) are the neutral ancillary ligands (A∧A). In both solution and diluted films, complex 1 shows a cyan emission with the emission maxima at ∼472 and 495 nm, and complexes 2–4 provide a deep blue emission with the emission maxima at ∼460 and 480 nm. While the complexes exhibit low to moderate phosphorescence efficiencies (0.05–0.35) in a degassed CH3CN solution, they exhibit high phosphorescence efficiencies (up to 0.82) in diluted films. Theoretical calculations revealed that the mixed 3π–π* (C∧N-centered)/3MLCT (Ir → C∧N) states are responsible for the emission afforded by complexes 1–4, which undergo nonradiative deactivations induced by different types of metal-centered states. Organic light-emitting diodes with complexes 1–4 as phosphorescent dopants are fabricated by a solution process, which affords a blue-green to blue emission with the emission maxima at ∼460 and 490 nm for the blue devices and a high current efficiency at 28.1 cd A–1 for the blue-green device. Solid-state light-emitting electrochemical cells are also fabricated with complexes 1–2 as phosphorescent dopants, which provide green-blue to blue emission with a high luminance (up to 840 cd m–2) and current-efficiency (up to 16.8 cd A–1) under a constant-current driving. The work reveals that, by using phenylimidazole-type C∧N ligands and optimized A∧A ligands, blue emissive cationic Ir(III) complexes with no fluorine substitutions but with sufficient blue-color purity and a high phosphorescence efficiency can be developed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cationic Ir(III) Complexes Featuring Phenylimidazole-type Cyclometalated Ligands: Fluorine-Free Blue Phosphorescent Emitters for Light-Emitting Devices

Song

Chen

et al. 2021

Inorg. Chem.

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One‐Pot Synthesis of 1, 2‐Dihydro [1,2,4] Triazinium Salt by Copper‐Assisted Unprecedented Cyclization Reaction: Applications in DNA and Protein Interaction Studies

Maji,

Yadav,

Sharma

et al. 2024

ChemPlusChem

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Copper catalyzed intramolecular annulation of 2‐((2benzylidene‐1‐phenylhydrazineyl)methyl)pyridine derivatives was described. It was found that Cu(II) is reduced under the reaction condition to Cu(I). Synthesized 1, 2‐dihydro [1,2,4] triazinium salt showed fluorescence activity in solid state. On treating with base, an instant increase in fluorescence was observed. A detailed physicochemical assessment underscored the robust DNA‐binding prowess of the [1,2,4] triazinium cationic species (C1‐C3) via intercalative mechanisms. Notably, binding assays with BSA accentuated the heightened nucleic acid affinity of these cationic species.

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Fluorine-free, blue-emitting cationic iridium complexes with a phenyl-triazole type cyclometalating ligand: Synthesis, characterizations and their use for efficient organic light-emitting diodes

Tian

Chen

et al. 2021

Dyes and Pigments

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Sky-blue-emitting cationic iridium complexes with oxadiazole/triazine-type counter-anions and their use for efficient solution-processed organic light-emitting diodes

Cited by 7 publications

References 58 publications

Cationic Ir(III) Complexes Featuring Phenylimidazole-type Cyclometalated Ligands: Fluorine-Free Blue Phosphorescent Emitters for Light-Emitting Devices

Cationic Ir(III) Complexes Featuring Phenylimidazole-type Cyclometalated Ligands: Fluorine-Free Blue Phosphorescent Emitters for Light-Emitting Devices

One‐Pot Synthesis of 1, 2‐Dihydro [1,2,4] Triazinium Salt by Copper‐Assisted Unprecedented Cyclization Reaction: Applications in DNA and Protein Interaction Studies

Fluorine-free, blue-emitting cationic iridium complexes with a phenyl-triazole type cyclometalating ligand: Synthesis, characterizations and their use for efficient organic light-emitting diodes

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