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.

中文翻译：

---

稳定的室温发光联苯甲基自由基

迄今为止，只有一类室温发光自由基，即三苯基甲基自由基。在这里，我们合成了一个新的稳定的室温发光基团，（N-咔唑基）双（2,4,6-叔氯苯基）甲基基团（CzBTM），与三苯基甲基基团相比，该基团具有更好的性能。X射线晶体学，电子顺磁共振光谱和磁化率测量结果证实了自由基的结构。CzBTM显示了各种解决方案中的室温深红色至近红外发射。通过用咔唑部分取代三氯苯，热稳定性和光稳定性均得到显着提高。CzBTM的电致发光结果证明了其潜在的应用前景，以解决传统荧光OLED中三重态捕获问题。