Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.218
Publication date: 16th December 2024
Lead halide perovskite quantum dots (PQDs) have emerged as promising materials for advanced optoelectronic applications due to their tunable excitonic properties.[1] However, achieving strong light-matter coupling in PQD films has been challenging due to issues with film quality, weak oscillator strengths and spectral diffusion.[2] Leveraging advances in PQD synthesis and film preparation,[3] we present the successful formation of uniform, thick, scattering-free films with well-defined excitonic transitions. By coupling these highly transparent cesium lead bromide (CsPbBr3) PQD solids with resonant modes of metallic resonators, multiple cavity exciton-polaritons at room temperature are obtained, evidenced by significant alterations in the absorption and emission spectra.[4]
Unlike traditional PQD systems, the dynamics observed by transient absorption spectroscopy (TAS) is dominated by the interplay of polaritonic states with dark-state reservoirs, while effects such as polaron formation are seemingly absent. The study also reports a substantial reduction in photoemission linewidth and ultrafast modulation of optical absorption properties on the picosecond timescale. These insights establish the groundwork for developing polaritonic devices with tunable photophysical properties and lay the foundation for pursuing phenomena like Bose-Einstein condensation in solid-state systems.[4]
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