Publication date: 15th December 2025
Lead halide perovskite quantum dots (QDs) exhibit remarkable optoelectronic potential due to their tuneable properties. In this context, achieving controlled collective interactions in QD solids under the strong light-matter coupling regime is expected to allow the development of high speed optoelectronic devices with enhanced efficiency [1]. Recently, a novel synthetic approach employing zwitterionic ligands has enabled the creation of high-concentration QD dispersions and the subsequent processing of uniform, scattering-free QD films [2], which has opened the possibility to integrate them in photonic architectures amenable to sustain exciton-polaritons [3]. In this study, we demonstrate that the strength of the exciton-photon coupling can be tuned by means of capping ligand engineering. We prepared optical quality films using QDs capped with three distinct zwitterionic ligands: lecithin, C12-C16-PEA and C8C12-PEA [2,4]. Upon integrating these films into optical cavities, we were able to observe the unequivocal features of the strong coupling regime: the anticrossing of the polaritonic branches, as shown in Figure 1, where absorptance maps of the different QD cavities are plotted versus the photon energy (E) and the parallel component of the wavevector (k||). The different ligands impose different interparticle separations, providing a means to control the QD volume density in the film, which, consequently, gives rise to the gradual variation of the Rabi splitting (ΩRabi) observed in Figure 1 [5]. Our work shows the potential of ligand engineering to modulate the coupling strength in QD polariton systems, opening a pathway for soft materials engineering to control quantum phenomena on a macroscopic scale.
The research leading to these results has received funding from the Spanish National Research Council (CSIC) under grant JAE-PRE23097 and PID2023-149344OB-100 funded by ICIU/AEI/ 10.13039/501100011033 and by ERDF/EU
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