Achieving 400 meV Rabi splitting and strong polariton photoluminescence in an all-solution-processed dielectric microcavity filled with Rhodamine 6G

Planar microcavity polaritons have recently emerged as a promising technology for improving several performance characteristics of organic optoelectronics. Traditional microcavities with high-reflectivity mirrors are fabricated by energy-intensive physical vapor deposition methods, which restrict their use in applications requiring flexibility and low cost [1]. In this talk, I will present how we achieved more than 400 meV Rabi-splitting together with strong photoluminescence with uniform dispersion along the lower polariton mode from a dielectric all-solution-processed polariton microcavity consisting of Rhodamine 6G films [2]. Using time-correlated single-photon counting and excitation power-dependent scans, we explored the effects of strong coupling on bimolecular interactions. We found that polariton microcavities exhibit a more than 10-fold increase in the critical excitation density for bimolecular annihilation compared to bare Rhodamine 6G films. We attributed this to the sub-3-fold measured enhancement of scattering of reservoir excitons to the lower polariton. [1]Palo and Daskalakis, 10.1002/admi.202202206, 2023 [2]Qureshi et.al., 10.48550/arXiv.2410.19392, 2024