Room-temperature polariton condensation in Plug-and-Play Organic dye-based DBR microcavity

Polariton lasers achieve coherence through polariton condensation and offer lower threshold power, making them more energy-efficient compared to conventional photonic lasers, which rely on stimulated emission. In this context, room-temperature polariton lasing have been explored using various organic materials for practical applications. Recently, the small-molecule, ionic isolation lattice (SMILES) method, a breakthrough that spatially isolates dye molecules within a structured lattice, prevents dye aggregation and concentration quenching by mixing a fluorescent dye with a colorless anion-binding macrocycle called cyanostar. This significantly enhances the photoluminescence quantum yield and enables bright polariton condensation in metal-DBR microcavities, despite the low-quality factor. Here, we report organic-based DBR microcavity with a top DBR transfer technique and demonstrate the polariton condensation with a narrow linewidth of 175 μeV, the narrowest reported for organic planar microcavities. Moreover, temporal coherence measurements reveal a coherence time of 30 ps, significantly higher than previously reported values. These results represent a significant step toward the development of coherent and stable polaritonic devices operating at room temperature.