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Conjugated, rigidified bibenzimidazole ancillary ligands for enhanced photoluminescence quantum yields of orange/red-emitting iridium(iii) complexes.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Henwood, Adam F. Antón-García, Daniel Morin, Mégane Martir, Diego Rota Cordes, David B. Casey, Colin M. Slawin, Alexandra M. Z. Lebl, Tomas Bühl, Michael Zysman-Colman, Eli |
| Copyright Year | 2019 |
| Abstract | A series of six novel [Ir(C^N)2(N^N)](PF6) complexes (C^N is one of two cyclometalating ligands: 2-phenyl-4-(2,4,6-trimethylphenyl)pyridine, MesppyH, or 2-(napthalen-1-yl)-4-(2,4,6-trimethylphenyl)pyridine, MesnpyH; N^N denotes one of four neutral diamine ligands: 4,4'-di-tert-butyl-2,2'-bipyridine, dtbubpy, 1H,1'H-2,2'-bibenzimiazole, H2bibenz, 1,1'-(α,α'-o-xylylene)-2,2'-bibenzimidazole, o-xylbibenz or 2,2'-biquinoline, biq) were synthesised and their structural, electrochemical and photophysical properties comprehensively characterised. The more conjugated MesnpyH ligands confer a red-shift in the emission compared to MesppyH but maintain high photoluminescence quantum yields due to the steric bulk of the mesityl groups. The H2bibenz and o-xylbibenz ligands are shown to be electronically indistinct to dtbubpy but give complexes with higher quantum yields than analogous complexes bearing dtbubpy. In particular, the rigidity of the o-xylbibenz ligand, combined with the steric bulk of the MesnpyH C^N ligands, gives a red-emitting complex 4 (λPL = 586, 623 nm) with a very high photoluminescence quantum yield (ΦPL = 44%) for an emitter in that region of the visible spectrum. These results suggest that employing these ligands is a viable strategy for designing more efficient orange-red emitters for use in a variety of photophysical applications. |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c9dt00423h |
| PubMed reference number | 30874276 |
| Journal | Medline |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c9/dt/c9dt00423h/c9dt00423h1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/c9dt00423h |
| Journal | Dalton transactions |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
