Distinct Ir(III) complexes containing unsymmetric ligands with fluorene-oxadiazole groups and their performance of organic light-emitting diodes

Liu, Jiawei; Zhou, Han-Chen; Wang, Zi-Kun; Tang, Xiong; Wu, Huayu; Wang, Shi; Wei, Lai; Li, Yonghua

doi:10.1016/j.dyepig.2022.110252

Cited by 4 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our group specially designed a series of asymmetric ligands to obtain asymmetric coordination complexes. 22 The results showed that the complexes with an asymmetric mode exhibited superior performance in OLEDs. In spite of this, the isolation and identification of the target products still remain a tough project, and the improvement of devices’ performance is limited in scope.…”

Section: Introductionmentioning

confidence: 97%

Improved electroluminescence efficiency derived from functionalized decoration of 1,3,4-oxadiazole (OXD)-based Ir(iii) complexes

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 97%

Improved electroluminescence efficiency derived from functionalized decoration of 1,3,4-oxadiazole (OXD)-based Ir(iii) complexes

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, metal-free organic phosphorescent materials have been extensively explored for several applications. Among all these phosphorescent materials, iridium cyclometalated complexes are one of the most commonly used classes of emitters in ss-LEDs such as organic light-emitting diodes (OLEDs) − and light-emitting electrochemical cells (LECs). , The phosphorescent nature of the Ir complexes makes it possible for singlet and triplet excitons to be used effectively, enabling the internal quantum efficiency (IQE) to consequently reach 100% and leading to high-performance OLEDs. Their unique properties, especially tunable emission color that covers approximately the entire visible spectrum, and high luminescence efficiencies have drawn tremendous attention in recent years and have prompted remarkable works in the LEC field.…”

Section: Introductionmentioning

confidence: 99%

Versatile Electroluminescence Color-Tuning Strategy of an Efficient Light-Emitting Electrochemical Cell (LEC) by an Ionic Additive

et al. 2022

View full text Add to dashboard Cite

The color-tuning strategies of solid-state light-emitting devices (ss-LEDs) are mainly focused on engineering molecular structures. In this paper, for the first time, we developed a facile strategy for tuning the electroluminescence (EL) color from orange to green through the addition of the ionic additive TBAP (tetrabutylammonium perchlorate). To achieve the active ionic emissive compound for use in a light-emitting electrochemical cell (LEC), the neutral biscyclometalated bromo tetrazole iridium(III) [Ir(ppy) 2 (BrTz)] was exchanged to its cationic complex, [Ir(ppy) 2 (BrTz-Me)]ClO 4 (ppy = 2-phenyl pyridine, BrTz = 4-bromo-2-pyridine tetrazole, BrTz-Me = 4-bromo-2pyridine methyl tetrazole) with a new synthetic strategy. This method allows employing neutral Ir-cyclometalated complexes, which are ruled out for use in LECs because of their non-ionic behaviors. In the following, an LEC based on the new cationic [Ir(ppy) 2 (BrTz-Me)]ClO 4 as the emissive layer was fabricated between the FTO (fluorine-doped tin oxide) anode and Ga:In alloy cathode without using any additive or polymers, which makes this configuration the simplest ss-LED so far. By adding the ionic additives, the electroluminescence characteristics of [Ir(ppy) 2 (BrTz-Me)]ClO 4 were dramatically increased, including luminance (L) from 162.8 cd/m 2 for the device with an additive to 212.9 and 355.9 cd/m 2 for devices containing LiTFSI (bis(trifluoromethane)sulfonamide lithium salt) and TBAP, respectively. In particular, when TBAP was added to the [Ir(ppy) 2 (BrTz-Me)]ClO 4 complex, the irradiance was significantly increased from 166.4 to 220.8 μW/cm 2 with an efficacy of 1.78 cd/A and external quantum efficiency (EQE) value of 2.14%. The obtained EL results clearly showed that adding TBAP and LiTFSI significantly improved the electroluminescence characteristics and tuned the electroluminescence color.

show abstract

Influential effect of C^N ligands containing O, S, and Se heteroatoms in the color tuning of four phosphorescent Ir(III) complexes

Chen,

Ma,

et al. 2024

J Chinese Chemical Soc

View full text Add to dashboard Cite

A group of new iridium(III) complexes were rationally designed and synthesized with 2‐phenylbenzo[d]oxazole (bo), 2‐phenylbenzo[d]thiazole (bt), 2‐(thiophen‐2‐yl)benzo[d]thiazole (thbt), and 2‐(selenophen‐2‐yl)benzo[d]thiazole (sebt) as C^N ligands and bis(diphenylthiophosphoryl)amide (S‐tpip) as ancillary ligand. They are phosphorescent in a wide region of green to red with short lifetimes around 0.31–0.98 μs and quantum yields up to 64.7%. The detailed photophysical properties were investigated by experiment and further supported by density functional theory (DFT) calculation. These research results show that the spectroscopic properties are tuned by the replacement between oxygen, sulfur, and selenium or the change in aromatic ring. It has been demonstrated that the lowest energy‐level absorption and emission are dominated apparently by C^N ligands, and are ascribed to metal‐to‐ligand charge transfer (MLCT) and intra‐ligand charge transfer (ILCT) characters.

show abstract

Distinct Ir(III) complexes containing unsymmetric ligands with fluorene-oxadiazole groups and their performance of organic light-emitting diodes

Cited by 4 publications

References 40 publications

Improved electroluminescence efficiency derived from functionalized decoration of 1,3,4-oxadiazole (OXD)-based Ir(iii) complexes

Improved electroluminescence efficiency derived from functionalized decoration of 1,3,4-oxadiazole (OXD)-based Ir(iii) complexes

Versatile Electroluminescence Color-Tuning Strategy of an Efficient Light-Emitting Electrochemical Cell (LEC) by an Ionic Additive

Influential effect of C^N ligands containing O, S, and Se heteroatoms in the color tuning of four phosphorescent Ir(III) complexes

Contact Info

Product

Resources

About