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Among the most common fluorogenic compounds, dyes are being exploited in bioimaging for their outstanding optical properties from UV down to the near IR (NIR). However, dye molecules are often toxic to living organisms and photodegradable, which limits the time window for in vivo experiments. Here, it is demonstrated that organic dye molecules are passivated and photostable when they are encapsulated inside a boron nitride nanotube (dyes@BNNT). The results show that the BNNTs drive an aggregation of the encapsulated dyes, which induces a redshifted fluorescence from visible to NIR\u2010II. The fluorescence remains strong and stable, exempt of bleaching and blinking, over a time scale longer than that of free dyes by more than 10<jats:sup>4<\/jats:sup>. This passivation also reduces the toxicity of the dyes and induces exceptional chemical robustness, even in harsh conditions. These properties are highlighted in bioimaging where the dyes@BNNT nanohybrids are used as fluorescent nanoprobes for in vivo monitoring of <jats:italic>Daphnia Pulex<\/jats:italic> microorganisms and for diffusion tracking on human hepatoblastoma cells with two\u2010photon imaging.<\/jats:p>","DOI":"10.1002\/adma.202001429","type":"journal-article","created":{"date-parts":[[2020,6,2]],"date-time":"2020-06-02T04:58:01Z","timestamp":1591073881000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["Confinement of Dyes inside Boron Nitride Nanotubes: Photostable and Shifted Fluorescence down to the Near Infrared"],"prefix":"10.1002","volume":"32","author":[{"given":"Charlotte","family":"Allard","sequence":"first","affiliation":[{"name":"D\u00e9partement de g\u00e9nie physique Polytechnique Montr\u00e9al  Montr\u00e9al Qu\u00e9bec H3C 3A7 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L\u00e9onard","family":"Schu\u00e9","sequence":"additional","affiliation":[{"name":"D\u00e9partement de chimie Universit\u00e9 de Montr\u00e9al  Montr\u00e9al Qu\u00e9bec H3C 3J7 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fr\u00e9d\u00e9ric","family":"Fossard","sequence":"additional","affiliation":[{"name":"Laboratoire d'Etude des Microstructures, ONERA\u2010CNRS, UMR104 Universit\u00e9 Paris\u2010Saclay  BP 72 Ch\u00e2tillon 92322 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ga\u00eblle","family":"Recher","sequence":"additional","affiliation":[{"name":"CNRS &amp; Institut d'Optique  UMR 5298 Talence F\u201033400 France"},{"name":"LP2N, Laboratoire Photonique Numerique et Nanosciences University of Bordeaux  Talence F\u201033400 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rafaella","family":"Nascimento","sequence":"additional","affiliation":[{"name":"D\u00e9partement de chimie Universit\u00e9 de Montr\u00e9al  Montr\u00e9al Qu\u00e9bec H3C 3J7 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emmanuel","family":"Flahaut","sequence":"additional","affiliation":[{"name":"CIRIMAT, Universit\u00e9 de Toulouse, CNRS, INPT, UPS, UMR CNRS\u2010UPS\u2010INP N\u00b05085 Universit\u00e9 Toulouse 3 Paul Sabatier  B\u00e2t. 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