Lyons Alexandra J, Naimovičius Lukas, Zhang Simon K, Pun Andrew B
Department of Chemistry and Biochemistry, University of California San Diego, 92093, La Jolla, CA, USA.
Angew Chem Int Ed Engl. 2024 Oct 21;63(43):e202411003. doi: 10.1002/anie.202411003. Epub 2024 Sep 12.
Triplet-triplet annihilation upconversion (TTA-UC) is a photophysical process in which two low-energy photons are converted into one higher-energy photon. This type of upconversion requires two species: a sensitizer that absorbs low-energy light and transfers its energy to an annihilator, which emits higher-energy light after TTA. In spite of the multitude of applications of TTA-UC, few families of annihilators have been explored. In this work, we show dipyrrolonaphthyridinediones (DPNDs) can act as annihilators in TTA-UC. We found that structural changes to DPND dramatically increase its upconversion quantum yield (UCQY). Our optimized DPND annihilator demonstrates a high maximum internal UCQY of 9.4 %, outperforming the UCQY of commonly used near-infrared-to-visible annihilator rubrene by almost double.
三重态-三重态湮灭上转换（TTA-UC）是一种光物理过程，其中两个低能量光子被转换为一个高能量光子。这种类型的上转换需要两种物质：一种敏化剂，它吸收低能量光并将其能量转移给湮灭剂，湮灭剂在TTA后发射高能量光。尽管TTA-UC有众多应用，但很少有湮灭剂家族被探索。在这项工作中，我们表明二吡咯并萘啶二酮（DPNDs）可以作为TTA-UC中的湮灭剂。我们发现DPND的结构变化显著提高了其上转换量子产率（UCQY）。我们优化后的DPND湮灭剂展示出9.4%的高最大内部UCQY，比常用的近红外到可见光的湮灭剂红荧烯的UCQY几乎高出一倍。
