TY - JOUR
T1 - Magnetoluminescence in a Photostable, Brightly Luminescent Organic Radical in a Rigid Environment
AU - Kimura, Shun
AU - Kusamoto, Tetsuro
AU - Kimura, Shojiro
AU - Kato, Ken
AU - Teki, Yoshio
AU - Nishihara, Hiroshi
N1 - Funding Information:
The present study was supported by JST CREST Grant Number JPMJCR15F2 and JSPS KAKENHI Grant Numbers JP26220801, JP16K13973, and JP17H04870. T.K. is grateful to the Ogasawara Foundation for the Promotion of Science and Engineering and Shorai Foundation for Science for financial support. S.K. acknowledges MERIT (Material Education program for the future leaders in Research, Industry, and Technology) in the MEXT Leading Graduate School Doctoral Program. This work was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No. 17H0018 and 16H0067).
Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/9/24
Y1 - 2018/9/24
N2 - 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 0.05 wt %-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 10 wt %-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 18 T at 4.2 K. This is the first observation of a magnetic field affecting the luminescence of organic radicals, and we also proposed a mechanism for this effect.
AB - 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 0.05 wt %-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 10 wt %-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 18 T at 4.2 K. This is the first observation of a magnetic field affecting the luminescence of organic radicals, and we also proposed a mechanism for this effect.
KW - doping
KW - excimer
KW - luminescence
KW - magnetic field effect
KW - radicals
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U2 - 10.1002/anie.201805466
DO - 10.1002/anie.201805466
M3 - Article
C2 - 29888548
AN - SCOPUS:85053445938
SN - 1433-7851
VL - 57
SP - 12711
EP - 12715
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 39
ER -