Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM, 91190, Gif-Sur-Yvette, France.
Department of Applied Chemistry and Biochemistry, Kumamoto University, Kumamoto, 860-8555, Japan.
Photochem Photobiol Sci. 2023 Jul;22(7):1673-1681. doi: 10.1007/s43630-023-00405-5. Epub 2023 Mar 22.
Photochromic materials are widely used to achieve fluorescence photoswitching. Understanding the energy transfer processes occurring in these systems would be an advantage for their use and better optimization of their properties. In this scope, we studied a diarylethene-perylenebisimide (DAE-PBI) dyad that presents a bright red emission and a large ON-OFF contrast, both in solution and in an aqueous suspension of nanoparticles (NPs). Using ultrafast transient absorption spectroscopy, the excited state dynamics was characterized for this dyad in THF solution and compared to its behavior in NPs state. An efficient energy transfer process between the PBI fluorophore and the DAE photochromic unit in its closed form was demonstrated, occurring in a few hundreds of femtoseconds.
光致变色材料被广泛用于实现荧光光开关。了解这些系统中发生的能量转移过程将有利于它们的应用和更好地优化它们的性能。在这个范围内，我们研究了一种二芳基乙烯-苝二酰亚胺（DAE-PBI）偶联物，它在溶液中和纳米粒子（NPs）的水悬浮液中都呈现出明亮的红色发射和大的开-关对比度。使用超快瞬态吸收光谱法，我们在 THF 溶液中对该偶联物的激发态动力学进行了表征，并将其与在 NPs 状态下的行为进行了比较。证明了在其闭合形式下，PBI 荧光团和 DAE 光致变色单元之间存在有效的能量转移过程，该过程在几百飞秒内发生。
