β-Diketiminate-Supported Iridium Photosensitizers with Increased Excited-State Reducing Power

2021 ◽  
Author(s):  
Jong-Hwa Shon ◽  
Dooyoung Kim ◽  
Thomas G Gray ◽  
Thomas S. Teets
Keyword(s):  
Excited State ◽  
Reducing Power ◽  
Iridium Complexes ◽  
Ancillary Ligands

A series of bis-cyclometalated iridium complexes were prepared which combine triazole or NHC-based cyclometalating ligands with substituted β-diketiminate (NacNac) ancillary ligands. The HOMO is localized on the NacNac ligand and...

Cationic Iridium Dendrimers: Synthesis and Photophysical Properties

2011 ◽  
Vol 64 (9) ◽  
pp. 1211 ◽  
Author(s):  
Bin Du ◽  
Si-Chun Yuan ◽  
Jian Pei
Keyword(s):  
Solid State ◽  
Photophysical Properties ◽  
Dendritic Structure ◽  
Benzimidazole Derivatives ◽  
Iridium Complex ◽  
Iridium Complexes ◽  
Efficient Energy Transfer ◽  
Ancillary Ligands ◽  
Synthetic Strategy ◽  
Yellow Orange

Two dendrimers, D1 and D2, containing the cationic iridium complexes (C1 and C2) as cores and truxene-functionalized chromophores as the branches, have been developed by a convergent synthetic strategy. The cationic complexes employ 3-(pyridin-2-yl)-1H-1,2,4-triazole and 2-(pyridin-2-yl)-benzimidazole derivatives as the ancillary ligands. To avoid the change in emission colour arising from the iridium complex, the conjugation between the dendron and the ligand is decoupled by separating them using the alkyl chain. An investigation of their photoluminescent features reveals that efficient energy transfer happens from the dendrons to the core in the solid state. Likewise, the charged dendritic structure is demonstrated to be an efficient method to improve the compatibility between the polar charged iridium complexes and typical hydrophobic hosts with the additional benefit of excellent solution processability. Both dendrimers exhibit strong solvatochromic behaviours in solvents and exclusive green and yellow-orange light in the solid state.

Cationic Iridium Complexes with Phenylpyridine and Strong Ancillary Ligands

2010 ◽  
Vol 520 (1) ◽  
pp. 108/[384]-115/[391]
Author(s):  
Ho Wan Ham ◽  
Young Sik Kim
Keyword(s):  
Iridium Complexes ◽  
Ancillary Ligands

Enhancing the electronic properties and quantum efficiency of sulfonyl/phosphoryl-substituted blue iridium complexes via different ancillary ligands

2015 ◽  
Vol 39 (5) ◽  
pp. 4147-4153 ◽  
Author(s):  
Yanling Si ◽  
Shuai Zhang ◽  
Nan Qu ◽  
Guoyou Luan ◽  
Zhijian Wu
Keyword(s):  
Electronic Properties ◽  
Quantum Efficiency ◽  
Electronic Structures ◽  
Energy Gap ◽  
Emission Spectra ◽  
Iridium Complexes ◽  
Ancillary Ligands ◽  
Absorption And Emission ◽  
Absorption And Emission Spectra

The influence of the ancillary ligands for iridium complexes on the electronic structures, absorption and emission spectra, and quantum efficiency was investigated. The results reveal that they not only tune the energy gap but also enhance the quantum efficiency.

Efficient near-infrared luminescence from bis-cyclometalated iridium(iii) complexes with rigid quinoline-derived ancillary ligands

2020 ◽  
Vol 56 (62) ◽  
pp. 8754-8757
Author(s):  
Po-Ni Lai ◽  
Sungwon Yoon ◽  
Thomas S. Teets
Keyword(s):  
Near Infrared ◽  
High Efficiency ◽  
Infrared Region ◽  
Iridium Complexes ◽  
Ancillary Ligands ◽  
Infrared Luminescence ◽  
Near Infrared Region

Rigid bis-cyclometalated iridium complexes with quinoline-based chelating ancillary ligands phosphoresce in the near-infrared region with high efficiency.

Synthetic Control of Excited-State Properties in Cyclometalated Ir(III) Complexes Using Ancillary Ligands

2005 ◽  
Vol 44 (6) ◽  
pp. 1713-1727 ◽  
Author(s):  
Jian Li ◽  
Peter I. Djurovich ◽  
Bert D. Alleyne ◽  
Muhammed Yousufuddin ◽  
Nam N. Ho ◽  
...  
Keyword(s):  
Excited State ◽  
Synthetic Control ◽  
Ancillary Ligands

Highly Phosphorescent Iridium Complexes with Chromophoric 2-(2-Hydroxyphenyl)oxazole-Based Ancillary Ligands: Interligand Energy-Harvesting Phosphorescence

2008 ◽  
Vol 47 (5) ◽  
pp. 1476-1487 ◽  
Author(s):  
Youngmin You ◽  
Jangwon Seo ◽  
Se Hun Kim ◽  
Kil Suk Kim ◽  
Tae Kyu Ahn ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Iridium Complexes ◽  
Ancillary Ligands

Wide bandgap iridium complexes varying by their ancillary ligands: Influence on their electroluminescence properties

2015 ◽  
Vol 204 ◽  
pp. 48-56 ◽  
Author(s):  
Marc Lepeltier ◽  
Pu Xiao ◽  
Bernadette Graff ◽  
Fabrice Morlet-Savary ◽  
Didier Gigmes ◽  
...  
Keyword(s):  
Wide Bandgap ◽  
Iridium Complexes ◽  
Ancillary Ligands

scholarly journals Improved Deep-Red Phosphorescence in Cyclometalated Iridium Complexes via Ancillary Ligand Modification

2019 ◽  
Author(s):  
Evanta Kabir ◽  
Steven Sittel ◽  
Boi-Lien Nguyen ◽  
Thomas Teets
Keyword(s):  
Rate Constant ◽  
Quantum Yields ◽  
Iridium Complexes ◽  
Ancillary Ligand ◽  
Ancillary Ligands ◽  
X Ray ◽  
X Ray Crystallography ◽  
Ligand Modification ◽  
Radiative Rate ◽  
Red Luminescence

In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating (C^N) ligands‒1-phenylisoquinoline (piq) and 2-(2- pyridyl)benzothiophene (btp)‒are used with six strong π-donating ancillary ligands (L^X) to furnish a suite of 10 new complexes with the general formula Ir(C^N)2(L^X). Improvements in deep-red photoluminescence quantum yields were accomplished by the incorporation of sterically encumbering substituents onto the ancillary ligand, which can enhance the radiative rate constant (kr) and/or reduce the non-radiative rate constant (knr). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.<br>

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