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However, solubility of these materials in water provides many advantages, such as additional process routes and easier handling. So far, solubilization of CdSe\/CdS nanocrystals in water that avoids detrimental effects on the luminescent properties poses a major challenge. This work demonstrates how core\u2013shell CdSe\/CdS quantum dot\u2010in\u2010rods can be transferred into water using a ligand exchange method employing mercaptopropionic acid (MPA). Key to maintaining the light\u2010emitting properties is an enlarged CdS rod diameter, which prevents potential surface defects formed during the ligand exchange from affecting the photophysics of the dot\u2010in\u2010rods. Films made from water\u2010soluble dot\u2010in\u2010rods show amplified spontaneous emission (ASE) with a similar threshold (130 \u03bcJ\/cm<jats:sup>2<\/jats:sup>) as the pristine material (115 \u03bcJ\/cm<jats:sup>2<\/jats:sup>). To demonstrate feasibility for lasing applications, self\u2010assembled microlasers are fabricated via the \u201ccoffee\u2010ring effect\u201d that display single\u2010mode operation and a very low threshold of \u223c10 \u03bcJ\/cm<jats:sup>2<\/jats:sup>. The performance of these microlasers is enhanced by the small size of MPA ligands, enabling a high packing density of the dot\u2010in\u2010rods.<\/jats:p>","DOI":"10.1002\/smll.201402527","type":"journal-article","created":{"date-parts":[[2014,10,21]],"date-time":"2014-10-21T19:59:07Z","timestamp":1413921547000},"page":"1328-1334","source":"Crossref","is-referenced-by-count":73,"title":["Single\u2010Mode Lasing from Colloidal Water\u2010Soluble CdSe\/CdS Quantum Dot\u2010in\u2010Rods"],"prefix":"10.1002","volume":"11","author":[{"given":"Francesco","family":"Di Stasio","sequence":"first","affiliation":[{"name":"Istituto Italiano di Tecnologia  Via Morego 30 IT\u2010 16163 Genoa Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joel Q.","family":"Grim","sequence":"additional","affiliation":[{"name":"Istituto Italiano di Tecnologia  Via Morego 30 IT\u2010 16163 Genoa 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