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)

Data:	2016
Resum:	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.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2012-38318-C03-02 Ministerio de Economía y Competitividad CTQ2012-30853
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Dye concentration ; Energy transfer process ; Facile preparation ; Low concentrations ; Molecular materials ; Photon up conversions ; Switching temperatures ; Up-conversion emission
Publicat a:	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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