期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 39, 页码 12711-12715出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201805466
关键词
doping; excimer; luminescence; magnetic field effect; radicals
资金
- JST CREST [JPMJCR15F2]
- JSPS KAKENHI [JP26220801, JP16K13973, JP17H04870]
- Ogasawara Foundation for the Promotion of Science and Engineering
- Shorai Foundation for Science
- High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University [17H0018, 16H0067]
We investigated the emission properties of a photostable luminescent organic radical, (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical (PyBTM), doped into host molecular crystals. The 0.05wt%-doped crystals displayed luminescence attributed to a PyBTM monomer with a room-temperature emission quantum yield of 89%, which is exceptionally high among organic radicals. The 10wt%-doped crystals exhibited both PyBTM monomer and excimer-centered emission bands, and the intensity ratio of these two bands was modulated drastically by applying a magnetic field of up to 18T at 4.2K. This is the first observation of a magnetic field affecting the luminescence of organic radicals, and we also proposed a mechanism for this effect.
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