Exciton-Polariton condensation in organic host-guest systems at room temperature*

Microcavity Exciton-Polaritons offer an attractive avenue to realize Bose Einstein like-condensation (BEC) at room temperature due to their low mass and de-localized wavefunctions. Solid state organic molecular systems are an attractive material platform to realize such condensates due to their high oscillator strength, exciton binding energy, high quantum yield and a rich vibrational landscape. Often these systems fall short in terms of their robustness and exhibit high exciton-exciton annihilation along with bimolecular quenching. Here, we report a new universal platform of supramolecular organic systems to realize room temperature condensation with the potential to incorporate more than 1000 commercially available dyes across the visible spectrum. Key to this scope is the plentiful array of commercial laser dyes. As a proof-of-principle demonstration, we use a rhodamine dye in this supramolcuilar co-assembly with cyanostar macrocycles to experimentally show optical nonlinearity and coherent emission of polaritons. Such systems are found to be robust against solid state aggregation-based nonradiative recombination and have near unity quantum yield. By energetically engineering the polariton mode to a vibron signature in our dye, we realize efficient scattering of polaritons to the system ground state before their decay as cavity photons.