Thermally switchable molecular upconversion emission
Massaro, Giuseppina (Università degli Studi di Perugia. Dipartimento di Chimica, Biologia e Biotecnologie)
Hernando Campos, Jordi (Universitat Autònoma de Barcelona. Departament de Química)
Ruiz-Molina, Daniel (Institut Català de Nanociència i Nanotecnologia)
Roscini, Claudio (Institut Català de Nanociència i Nanotecnologia)
Latterini, Loredana (Università degli Studi di Perugia. Dipartimento di Chimica, Biologia e Biotecnologie)

Date:	2016
Abstract:	In this work a novel strategy is introduced to achieve thermally switchable emission from photon upconversion (UC) systems based on organic dyes. When these molecules were dissolved at low concentrations in phase-change media, a reversible, sharp, and nearly complete interconversion from blue upconverted emission to red luminescence was observed around the solid-to-liquid transition of the system. This result was rationalized in terms of dye aggregation, which selectively occurs in the solid state and dramatically enhances the inter-chromophoric energy transfer processes leading to UC. Notably, this behavior is extendable to different media and dyes, which allows an easy tuning of the switching temperature and emission colors. In addition, with proper selection of the phase-change medium, our strategy permits facile preparation of solid molecular materials showing photon UC at room temperature and even at sub-micromolar dye concentrations.
Grants:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2012-38318-C03-02 Ministerio de Economía y Competitividad CTQ2012-30853
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Dye concentration ; Energy transfer process ; Facile preparation ; Low concentrations ; Molecular materials ; Photon up conversions ; Switching temperatures ; Up-conversion emission
Published in:	Chemistry of materials, Vol. 28, issue 3 (Feb. 2016) , p. 738-745, ISSN 1520-5002

DOI: 10.1021/acs.chemmater.5b03532

Postprint 11 p, 631.8 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles