Achieving long-term water stability and strong exciton-photon coupling in CsPbBr quantum dots via MOF encapsulation.

CsPbBr perovskite quantum dots (QDs) are renowned for their exceptional optical properties, including high quantum efficiency, strong exciton binding energy, and tunable emission wavelengths. However, their practical application is hindered by their inherent susceptibility to environmental degradation. In this study, we introduce a CsPbBr@UiO-66 composite material, where CsPbBr QDs self-assemble within the microporous framework of UiO-66, a robust metal-organic framework (MOF). This encapsulation strategy significantly enhances the environmental stability of CsPbBr QDs, maintaining luminescence for over 30 months under ambient conditions and several hours underwater. Temperature-dependent and time resolved photoluminescence (TRPL) measurements further revealed the exciton-phonon interaction within the CsPbBr@UiO-66 material. We distributed CsPbBr@UiO-66 into a hybrid microcavity (MC) and observed strong exciton-polariton coupling, showcasing the remarkable light-matter interaction capabilities of the composite. These findings highlight the potential of CsPbBr@UiO-66 as a robust platform for advanced polaritonic applications, paving the way for next-generation optoelectronic devices and quantum technologies.