Guan Zhihao, Tang Zhaorun, Zeng Jianwen, Zheng Yuewei, Ding Lin, Chen Dongzhi, Li Houbin, Liu Xinghai
Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument, School of Electronic Information, Wuhan University, Wuhan, 430072, P. R. China.
State Key Laboratory of New Textile Materials & Advanced Processing Technology, Wuhan Textile University, Wuhan, 430073, P. R. China.
Adv Sci (Weinh). 2024 Aug;11(32):e2402632. doi: 10.1002/advs.202402632. Epub 2024 Jun 24.
Ultralong room-temperature phosphorescent (URTP) materials have attracted wide attention in anti-counterfeiting, optoelectronic display, and bio-imaging due to their special optical properties. However, room-temperature blue phosphorescent materials are very scarce during applications because of the need to simultaneously populate and stabilize high-energy excited states. In this work, a stepwise stiffening chromophore strategy is proposed to suppress non-radiative jump by continuously reducing the internal spin of the chromophore, and successfully developing a series of blue phosphorescent materials. Phosphorescence lifetimes of more than 3 s are achieved, with the longest lifetime reaching 5.44 s and lasting more than 70 s in the naked eye. As far as is know, this is the best result that has been reported. By adjusting the chromophore conjugation, multicolor phosphorescences from cyan to green have been realized. In addition, these chromophores exhibit the same excellent optical properties in urea and polyvinyl alcohmance (PVA). Finally, these materials are successfully applied to luminescent displays.
超长室温磷光（URTP）材料因其特殊的光学性质，在防伪、光电显示和生物成像等领域受到广泛关注。然而，由于需要同时填充和稳定高能激发态，室温蓝色磷光材料在应用中非常稀缺。在这项工作中，提出了一种逐步增强发色团的策略，通过不断降低发色团的内禀自旋来抑制非辐射跃迁，并成功开发了一系列蓝色磷光材料。实现了超过3秒的磷光寿命，最长寿命达到5.44秒，并在肉眼下持续超过70秒。据所知，这是已报道的最佳结果。通过调节发色团共轭，实现了从青色到绿色的多色磷光。此外，这些发色团在尿素和聚乙烯醇（PVA）中表现出相同优异的光学性质。最后，这些材料成功应用于发光显示。
