Dual-emissive materials with both fluorescence and room-temperature phosphorescence (RTP) are extensively used in bioimaging, sensors, and optoelectronics. Here, a series of N,N-substituted benzophenone-based waterborne polyurethanes (WPUs) were synthesized by a facile polycondensation reaction, which exhibit both delayed fluorescence (DF) and RTP emission utilizing strong intramolecular charge-transfer states (CT states) to serve as a bridge between singlet and triplet states. The basic structural and luminescent characterization is mainly investigated. With an increase in dye loadings, there is a progressive mergence between the singlet and triplet states, which can be explained by polymerization-enhancing intersystem crossing (PEX), a model based on Kasha's molecular exciton theory, leading to tunable fluorescence and RTP. As a result, by a rational design it could be a common method to develop single-component luminescent materials with both fluorescence and RTP.

中文翻译：

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由二苯甲酮衍生物制备的水性聚氨酯，其荧光延迟和室温磷光延迟†

具有荧光和室温磷光（RTP）的双发射材料广泛用于生物成像，传感器和光电。在这里，一系列N，N通过容易的缩聚反应合成了取代的二苯甲酮基水性聚氨酯（WPU），利用强大的分子内电荷转移态（CT状态）作为单重态和三重态之间的桥梁，它同时显示了延迟荧光（DF）和RTP发射。 。主要研究了其基本结构和发光特性。随着染料载量的增加，单重态和三重态之间逐渐进行合并，这可以通过基于Kasha分子激子理论的聚合增强系统间杂交（PEX）来解释，从而产生可调谐的荧光和RTP。结果，通过合理的设计，开发具有荧光和RTP的单组分发光材料可能是一种通用方法。