Presentation Information
[23a-A309-1]Control of electroluminescence property of single molecules though strong light-matter coupling
〇Kuniyuki Miwa1,2, Souichi Sakamoto1, Akihito Ishizaki1,2 (1.IMS, 2.SOKENDAI)
Keywords:
electroluminescence,single-molecule junction,strong coupling
In organic electroluminescence devices, efficient generation of emissive excited electronic states is key to improving the luminescence efficiency. Compared with the emissive singlet states, the corresponding triplet states typically exhibit considerably lower radiative efficiencies and consequently act as a source of energy loss in the devices. In this study, we introduce a novel concept for realizing efficient electroluminescence from single-molecule junctions by enhancing the coupling between photoactive molecular degrees of freedom and the vacuum field, which is the zero-point quantum fluctuations of the electromagnetic field. Strong coupling of a molecule in the single-molecule junction with the vacuum field is found to circumvent the formation of the triplet states and enable selective excitation of the emissive state via carrier injection, leading to a significant improvement in the electroluminescence efficiency. We demonstrate the effectiveness of the scheme and propose a setup to realize higher efficiency.