Huang Ping, Zou Xingzi, Xu Zhiyun, Lan Yanting, Chen Lijuan, Zhang Baohua, Niu Li
Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & Devices, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
Molecules. 2022 Nov 2;27(21):7457. doi: 10.3390/molecules27217457.
Very recently, there is a great research interest in electrochemiluminescence (ECL) featuring thermally activated delayed fluorescence (TADF) properties, i.e., TADF-ECL. It is appealing since the earlier reports in this topic well-confirmed that this strategy has a great potential in achieving all-exciton-harvesting ECL efficiency under electrochemical excitation, which is a breakthrough in the topic of organic ECL. However, organic phase electrochemistry and ECL studies surrounding TADF-ECL are still extremely rare. Especially, the ECL spectra of previous reported TADF emitters are still very different from their PL spectra. In this work, we systematically measure and discuss the liquid electrochemistry and ECL behavior of two typical TADF molecules in organic medium. Most importantly, we verify for the first time that the ECL spectra of them (coreactant ECL mode) are identical to their PL spectra counterparts, which confirms the effectiveness of TADF photophysical properties in the coreactant ECL mode in practice.
最近，人们对具有热激活延迟荧光（TADF）特性的电化学发光（ECL），即TADF-ECL产生了浓厚的研究兴趣。这很有吸引力，因为该主题的早期报告充分证实，这种策略在电化学激发下实现全激子捕获ECL效率方面具有巨大潜力，这是有机ECL主题的一个突破。然而，围绕TADF-ECL的有机相电化学和ECL研究仍然极为罕见。特别是，先前报道的TADF发射体的ECL光谱与其PL光谱仍有很大差异。在这项工作中，我们系统地测量并讨论了两种典型TADF分子在有机介质中的液体电化学和ECL行为。最重要的是，我们首次验证了它们的ECL光谱（共反应剂ECL模式）与其PL光谱对应物相同，这在实践中证实了TADF光物理性质在共反应剂ECL模式中的有效性。
