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Whereas the inorganic core can be comprehensively characterized at atomic resolution, ligands remain difficult to probe owing to their low atomic contrast and soft, disordered structure. Here, we empower single\u2010particle photoluminescence (PL) spectroscopy to characterize the organic ligand shell. Tagging ligand tails with organic dyes enables measuring their distance from the QD via F\u00f6rster resonance energy transfer (FRET) at sub\u2010nanometer resolution. Single\u2010particle, single\u2010molecule FRET experiments performed on lead halide perovskite QDs reveal nanometer\u2010scale variations in dye\u2010surface distances, both within individual particles (0.81 \u00b1 0.22\u00a0nm on average) and between QDs with varied ligand chemistries (from 0.25 to 1.02\u00a0nm). Supported by atomistic modelling, our experiments tie diverse local ligand environments to these variations, validating a powerful yet accessible spectroscopic method for interrogating the complex surface chemistry of QDs, highly relevant to QD\u2010based optoelectronics, quantum applications, and photocatalysis.<\/jats:p>","DOI":"10.1002\/adma.75051","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T13:04:46Z","timestamp":1789736686000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Single\u2010Particle FRET Probes Heterogeneity in the Ligand Shell of Colloidal Perovskite Quantum Dots"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9755-5085","authenticated-orcid":false,"given":"Leon G.","family":"Feld","sequence":"first","affiliation":[{"name":"Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  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