Publication date: 8th July 2026
After the seminal work of Pringsheim1 on a fluorescent gas (Na vapor) in 1929, substantial progress has also been made in laser cooling of bulk solid-state matter via phonon-mediated photoluminescence upconversion, chiefly in rare-earth-doped crystals and semiconductors2, 3, 4, 5, 6, 7. However, extending laser cooling to individual solid-state quantum emitters, key building blocks for diverse quantum photonics applications, has remained elusive due to the twin challenge of preserving near-unity photoluminescence quantum yield at the single-particle level and effectively suppressing thermal backflow from the environment. Here, we experimentally demonstrate individual QDs with near-unity quantum yield cool reversibly and rapidly (< 1 s) upon sub-bandgap laser excitation, as inferred from redshifted, spectrally narrowed photoluminescence and accelerated radiative decay. Atomistic and continuum heat-transport simulations identify the organic ligand shell as an efficient thermal barrier, allowing the QD core to be cooled to several tens of K below its environment. This work establishes laser cooling at the single-emitter level and promises a scalable pathway to cryogen-free, narrowband, and coherent solid-state quantum-light sources.
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