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Simple and extremely efficient blue emitters based on mononuclear Cu(I)-halide complexes with delayed fluorescence
| Title: | Simple and extremely efficient blue emitters based on mononuclear Cu(I)-halide complexes with delayed fluorescence |
| Authors: | Ohara, Hiroki Browse this author | | Kobayashi, Atsushi Browse this author →KAKEN DB | | Kato, Masako Browse this author →KAKEN DB |
| Issue Date: | 14-Dec-2014 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Dalton transactions |
| Volume: | 43 |
| Issue: | 46 |
| Start Page: | 17317 |
| End Page: | 17323 |
| Publisher DOI: | 10.1039/c4dt02709d |
| PMID: | 25315634 |
| Abstract: | Simple mononuclear Cu(I)-halide complexes, [CuX(PPh3)(2)(4-Mepy)] (X = Cl-, Br-, I-; PPh3 = triphenylphosphine; 4-Mepy = 4-methylpyridine), were prepared. They exhibit blue light emission, with extremely high photoluminescence quantum yields approaching 100% in the crystals. Emission lifetime analyses and density functional theory calculations revealed that the bright blue light emission at room temperature is mainly delayed fluorescence originating from the singlet metal-to-ligand charge transfer (MLCT) state combined with the halide-to-ligand charge transfer (XLCT) state, ((1)(M + X)LCT), while that at 77 K is phosphorescence from the (3)(M + X) LCT transition state, due to the small singlet-triplet energy differences (Delta E = 940-1170 cm(-1)). The ternary ligand systems consisting of halide, bulky phosphine, and N-heteroaromatic ligands constitute inexpensive pure-blue-light-emitting materials, which can be fabricated by facile procedures such as simple manual grinding. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/60320 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 加藤 昌子
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