Abdelmagid Ahmed Gaber, Qureshi Hassan A, Papachatzakis Michael A, Siltanen Olli, Kumar Manish, Ashokan Ajith, Salman Seyhan, Luoma Kimmo, Daskalakis Konstantinos S
Department of Mechanical and Materials Engineering, University of Turku, Turku, Finland.
Chemistry Department, Clark Atlanta University, Atlanta, GA 30314, USA.
Nanophotonics. 2024 Jan 8;13(14):2565-2573. doi: 10.1515/nanoph-2023-0587. eCollection 2024 Jun.
Modifying the energy landscape of existing molecular emitters is an attractive challenge with favourable outcomes in chemistry and organic optoelectronic research. It has recently been explored through strong light-matter coupling studies where the organic emitters were placed in an optical cavity. Nonetheless, a debate revolves around whether the observed change in the material properties represents novel coupled system dynamics or the unmasking of pre-existing material properties induced by light-matter interactions. Here, for the first time, we examined the effect of strong coupling in polariton organic light-emitting diodes via time-resolved electroluminescence studies. We accompanied our experimental analysis with theoretical fits using a model of coupled rate equations accounting for all major mechanisms that can result in delayed electroluminescence in organic emitters. We found that in our devices the delayed electroluminescence was dominated by emission from trapped charges and this mechanism remained unmodified in the presence of strong coupling.
改变现有分子发光体的能量格局是一项具有吸引力的挑战，在化学和有机光电子研究中能产生良好的结果。最近通过强光与物质耦合研究对此进行了探索，其中将有机发光体置于光学腔中。尽管如此，围绕观察到的材料特性变化是代表新型耦合系统动力学还是由光与物质相互作用引发的先前存在的材料特性的揭示，仍存在争议。在此，我们首次通过时间分辨电致发光研究，研究了强耦合在极化激元有机发光二极管中的作用。我们使用耦合速率方程模型进行理论拟合，伴随我们的实验分析，该模型考虑了所有可能导致有机发光体中电致发光延迟的主要机制。我们发现，在我们的器件中，延迟电致发光主要由捕获电荷的发射主导，并且在强耦合存在的情况下，这一机制保持不变。
