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Adv."],"published-print":{"date-parts":[[2026,8,14]]},"abstract":"<jats:p>Superfluorescence (SF), the coherent light burst from synchronized quantum emitters, has been demonstrated in perovskite quantum dot superlattices. However, limited control over self-assembly, heterogeneity and emitter properties has hindered systematic exploration of cooperative emission and its transition to collective emission regimes such as amplified spontaneous emission (ASE) and lasing. Here, we present emulsion-templated perovskite superballs (SBs) as a robust, tunable platform for investigating collective light-matter phenomena. This strategy enables versatile control over perovskite nanocrystal (PNC) size, packing density, ligand chemistry, optical cavity structure, etc. We identify a critical packing density (\u223c0.34) for triggering SF in PNC ensembles, in agreement with theoretical calculations. Larger SBs function as self-assembled microcavities, supporting low-threshold lasing with high quality factors. Tunable excitation fluence induces a crossover between the SF and lasing regimes, while high-density SB films also support ASE. These findings establish perovskite SBs as a versatile platform for studying cooperative and collective emission dynamics crucial for advancing scalable quantum photonic technologies.<\/jats:p>","DOI":"10.1126\/sciadv.aec0398","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T17:58:41Z","timestamp":1786730321000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Cooperative and collective quantum light emission from perovskite superball superstructures"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6961-0418","authenticated-orcid":true,"given":"Yue","family":"Yu","sequence":"first","affiliation":[{"name":"Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, 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