Publication date: 15th December 2025
Low dimensional perovskites exhibit outstanding properties—including high environmental and thermal stability—which position them as a promising alternative to conventional ABX₃ perovskites1, In recent years, nanostructured perovskite films featuring intense excitonic bands have been integrated into Fabry–Perot optical cavities, enabling the observation of strong light–matter coupling2,3. Under this regime, a reconfiguration of excitonic and photonic modes occurs to form new hybrid states, known as exciton–polaritons4. These systems are highly relevant for next‑generation optoelectronic devices, such as light‑emitting devices, photodetectors, and low‑threshold lasers, and they also offer a platform for exploring complex physical phenomena including polariton Bose–Einstein condensation4,5.
Herein we present an alternative strategy to achieve strong light–matter coupling using Ruddlesden–Popper 2D perovskites embedded within an optical cavity. Our approach employs a mesoporous matrix with a narrow nanopore size distribution, enabling precise control over both the structural quality and phase purity of the confined 2D perovskite. Additionally, by tuning the thickness of the mesoporous layer, we can finely adjust the cavity resonances. This accurate thickness control allows us to modulate the cavity mode spacing and, consequently, the polariton dispersion, granting precise control over the material’s emission and absorption properties. Our nanoporous scaffold based approach allows Rabi splitting exceeding 200 meV, outperforming both in performance, stability and tuneability several other previous approaches based on low dimensional perovskites.
The research leading to these results has received funding from the Spanish National Reserch Council (CSIC) under grant PID2023-149344OB-100 funded by Ministry of Science, Innovation and Universities, the State Research Agency (AEI), and co-funded by the European Union.
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