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A Stable Room‐Temperature Luminescent Biphenylmethyl Radical

Abstract

There is only one family of room‐temperature luminescent radicals, the triphenylmethyl radicals, to date. Herein, we synthesize a new stable room‐temperature luminescent radical, (N‐carbazolyl)bis(2,4,6‐tirchlorophenyl)methyl radical (CzBTM), which has improved properties compared to the triphenylmethyl radicals. X‐ray crystallography, electron paramagnetic resonance spectroscopy, and magnetic susceptibility measurements confirmed the radical structure. CzBTM shows room‐temperature deep‐red to near‐infrared emission in various solutions. Both thermal and photo stability were significantly enhanced by the replacement of trichlorobenzene by the carbazole moiety. The electroluminescence results of CzBTM verify its potential application to circumvent the problem of triplet harvesting in traditional fluorescent OLEDs. A new family of stable luminescent radicals based on CzBTM is anticipated.

Radical enhancement: A stable room‐temperature luminescent biphenylmethyl radical (CzBTM) was synthesized. Both thermal and photo stability were enhanced significantly by the replacement of a trichlorobenzene moiety by a carbazole moiety. The electroluminescence results of CzBTM support its potential application to circumvent the problem of triplet harvesting in traditional fluorescent OLEDs.

Autoren:   Xin Ai, Yingxin Chen, Yuting Feng, Feng Li
Journal:   Angewandte Chemie International Edition
Jahrgang:   2018
Seiten:   n/a
DOI:   10.1002/anie.201713321
Erscheinungsdatum:   17.01.2018
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