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However, previous cQD lasing demonstrations have largely depended on close\u2010packed solid\u2010state films, which are deemed essential to counteract the rapid decay of material gain. In this study, a novel approach is introduced utilizing \u201centropic ligands and solvent\u201d to enhance the solubility of cQDs in solution. By achieving the necessary critical volume fraction for lasing, this strategy leads to the groundbreaking development of the first liquid\u2010state vertical\u2010cavity surface\u2010emitting lasers (VCSELs) based on cQDs across the blue and green spectrum, encompassing diverse material systems such as CdSe\u2010based and InP\u2010based cQDs. Furthermore, by integrating the liquid\u2010state VCSEL with a microfluidic channel, it is demonstrated that heat dissipation during intense excitation is pivotal for cQD lasing likely across various excitation modes\u2014whether pulsed or continuous\u2010wave, optically or electrically\u2010pumped\u2014and different media, including liquid and solid states. The research will lay the foundation for a new era of liquid\u2010state cQD lasers for specific occasions, distinguished by their customizable and largely\u2010variable wavelengths, compact form factors, diverse materials basis, and dependable performance.<\/jats:p>","DOI":"10.1002\/adma.202414953","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T10:02:37Z","timestamp":1741687357000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Red, Green and Blue Liquid\u2010Film Lasers Based on Colloidal Quantum\u2010Dots"],"prefix":"10.1002","volume":"37","author":[{"given":"Zixuan","family":"Song","sequence":"first","affiliation":[{"name":"Zhejiang Key Laboratory of Excited\u2010State Energy Conversion and Energy Storage and College of Information Science and Electronic Engineering Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuyue","family":"Li","sequence":"additional","affiliation":[{"name":"Zhejiang Key Laboratory of Excited\u2010State Energy Conversion and Energy Storage and Department of Chemistry Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9460-8401","authenticated-orcid":false,"given":"Xing","family":"Lin","sequence":"additional","affiliation":[{"name":"Zhejiang Key Laboratory of Excited\u2010State Energy Conversion and Energy Storage and College of Information Science and Electronic Engineering Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huifeng","family":"Wang","sequence":"additional","affiliation":[{"name":"Zhejiang Key Laboratory of Excited\u2010State Energy Conversion and Energy Storage and Department of Chemistry Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Gao","sequence":"additional","affiliation":[{"name":"Najing Technology Corporation Ltd.  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