Purcell-enhanced bright and dark exciton emission from strongly confined perovskite quantum dots coupled to micro-ring cavity

Integrated photonic devices utilizing quantum emitters offer a promising platform for enhanced and controlled light-matter interactions at micro- and nano-scale. In addition, compatibility with scalable and simplified manufacturing of integrated photonic circuits will lead to lower variability and cost. In this work, we present colloidal photoemitters, integrated with low-loss photonic waveguides and micro-cavities, with improved control of emission dynamics and directionality. Using a simple spin-coating/rinsing process, we achieve large-scale deposition of quantum dots (QDs) onto photonic structures, where QDs preferentially adhere to the Si3N4 ring cavity. The system exhibits stable cavity-coupled photoluminescence (PL) along with a Purcell-enhanced radiative decay of both bright and dark excitons of strongly quantum-confined CsPbBr3 QDs, demonstrating light-matter interaction within colloidal QDs and the micro-ring cavity. The strong exciton effect and efficient coupled PL make this combination a promising candidate for a chip-sized source of non-classical states of light for quantum sensing and quantum information processing applications.