A Stable Room-Temperature Luminescent Biphenylmethyl Radical

Xin Ai; Yingxin Chen; Yuting Feng; Feng Li

doi:10.1002/anie.201713321

A Stable Room-Temperature Luminescent Biphenylmethyl Radical

Angew Chem Int Ed Engl. 2018 Mar 5;57(11):2869-2873. doi: 10.1002/anie.201713321. Epub 2018 Jan 17.

Authors

Xin Ai¹, Yingxin Chen¹, Yuting Feng¹, Feng Li¹

Affiliation

¹ State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Avenue 2699, Changchun, 130012, P. R. China.

PMID: 29341421
DOI: 10.1002/anie.201713321

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.

Keywords: luminescence; organic light-emitting diodes; radicals; stability.

Publication types

Research Support, Non-U.S. Gov't