Department of Chemistry , Columbia University , New York , New York 10027 , United States.
Rowland Institute at Harvard University , Cambridge , Massachusetts 02142 , United States.
J Am Chem Soc. 2019 Mar 6;141(9):3777-3781. doi: 10.1021/jacs.8b11796. Epub 2019 Feb 22.
Optical upconversion based on triplet fusion (TF), also known as triplet-triplet annihilation, is a process by which two or more low-energy photons are converted to one higher energy photon. This process requires two components, a sensitizer which absorbs the incident low-energy photons and an annihilator which emits the higher energy photons. While much attention has been given to the investigation of new types of sensitizers, very little work has been done on the exploration of new annihilators. In this work, we show that the singlet energy of diketopyrrolopyrroles (DPPs) can be altered by modifying the pendant aryl substituents to the core. This allows us to meet the energetic requirements necessary for TF upconversion and demonstrates DPPs as a new class of annihilator molecules. Using this new DPP platform, the output wavelength from upconversion can easily be tuned, which will greatly diversify the number of applications of DPPs in upconversion technologies.
基于三重态融合（TF）的光学上转换，也称为三重态-三重态湮灭，是一种将两个或更多低能量光子转换为一个更高能量光子的过程。该过程需要两个组件，一个敏化剂吸收入射的低能量光子，一个湮灭剂发出更高能量的光子。虽然人们对新型敏化剂的研究给予了极大的关注，但对新型湮灭剂的探索却很少。在这项工作中，我们表明通过修饰核心上的芳基取代基，可以改变二酮吡咯并吡咯（DPP）的单线态能量。这使我们能够满足 TF 上转换所需的能量要求，并证明 DPP 是一类新型的湮灭剂分子。使用这个新的 DPP 平台，可以轻松地调整上转换的输出波长，这将极大地增加 DPP 在上转换技术中的应用数量。
