ArticleACS photonics2026
High Power, Efficient, and Stable Quantum Dot-Based Downconverters for SWIR Applications.
Article in ACS photonics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Shortwave infrared light sources are indispensable for various applications, including advanced imaging, spectroscopy, and sensing, yet their widespread adoption is limited by the high cost of epitaxial semiconductors, such as InGaAs. Downconverters (DCs) offer a cost-effective alternative, and quantum dots (QDs) stand out due to their high photoluminescence quantum yield, size-tunable emission, and solution processability. However, QD-DCs suffer from performance degradation under high excitation power densities due to significant heat generation in the process of light absorption. Here we have developed high-power, stable, and spectrally tunable narrowband and broadband SWIR DCs (1000-1600 nm) based on Lead sulfide QDs. By mixing two different-sized QDs, we exploit Förster resonance energy transfer and photon reabsorption to realize a binary system with a high photoluminescence quantum yield of 35%. Embedding the QDs in a poly-(methyl methacrylate) host mitigates local thermal stress on the QDs, enabling standalone DCs with a high emission power density (EmPD) of 110 mW/cm
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