Watson Alexander E R, Tao Si Yuan, Siemiarczuk Alex, Boyle Paul D, Ragogna Paul J, Gilroy Joe B
Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, ON N6A 5B7, Canada.
HORIBA Canada, Inc., 347 Consortium Ct., London, ON N6E 2S8, Canada.
Angew Chem Int Ed Engl. 2025 Jan 10;64(2):e202414534. doi: 10.1002/anie.202414534. Epub 2024 Nov 11.
Emissive organic materials are predominantly fluorescent and there is significant interest in realizing and understanding examples that defy this paradigm and exhibit phosphorescence under ambient conditions. Organic room temperature phosphorescence (ORTP) offers the long-lived excited states and bathochromically-shifted emission maxima of phosphorescence without the use of potentially toxic and expensive transition metals. Most ORTP materials rely on well-studied structural motifs that include aryl carbonyls, sulfones, and heavy main group elements. We report the unexpected ORTP of a series of heavy atom-free BN-substituted xanthene derivatives. The creation of heteroatom-rich scaffolds, combined with stabilizing C-H⋅⋅⋅F interactions in the solid-state, resulted in oxygen-tolerant heavy atom-free organic phosphorescence without relying on the use of cryogenic temperatures, polymer matrices, or host-guest interactions. The observation of ORTP in these simple systems sets a blueprint for the further development of heavy atom-free organic phosphors.
发光有机材料主要是荧光性的，人们对实现和理解那些违背这一范式并在环境条件下表现出磷光的例子有着浓厚兴趣。有机室温磷光（ORTP）提供了磷光的长寿命激发态和红移发射最大值，而无需使用潜在有毒且昂贵的过渡金属。大多数ORTP材料依赖于经过充分研究的结构单元，包括芳基羰基、砜和重主族元素。我们报道了一系列无重原子的BN取代呫吨衍生物的意外ORTP。富含杂原子支架的构建，结合固态中稳定的C-H⋅⋅⋅F相互作用，产生了耐氧的无重原子有机磷光，而无需依赖低温温度、聚合物基质或主客体相互作用。在这些简单体系中观察到的ORTP为无重原子有机磷光体的进一步发展奠定了蓝图。
