Triplet-triplet annihilation based upconversion in silica matrices
| Autor: | Fausto Ortica, Valeria Ambrogi, Morena Nocchetti, Fabio Marmottini, Giuseppina Massaro, Pier Luigi Gentili, Loredana Latterini |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element 02 engineering and technology Up-conversion 010402 general chemistry Photochemistry 01 natural sciences Fluorescence chemistry.chemical_compound General Materials Science Phosphorescence Chemistry (all) General Chemistry Mesoporous silica Maximum entropy method 021001 nanoscience & nanotechnology Condensed Matter Physics Photon upconversion 0104 chemical sciences Monomer chemistry Mechanics of Materials Silica materials Materials Science (all) Time-resolved spectroscopy 0210 nano-technology Mesoporous material Platinum |
| Popis: | Triplet-triplet annihilation based upconversion emission (TTA-UC), through energy transfer processes among organic dyes, has been achieving great attentions for the potential applications in different fields; an important step forward the application of TTA-UC systems in real devices is the incorporation of the dye couple into solid supports. In this work mesoporous silica (SBA) with regular pores and silica nanoparticles (SNs) with core-shell structure were prepared and loaded with 2,3,7,8,12,13,17,18–octaethyl–21 H ,23 H –porphine platinum(II) (PtOEP) and 1,3,6,8–Tetraphenylpyrene (TPPy) which act as antenna/sensitizer of the TTA-UC process and as light emitting species, respectively. The samples were fully characterized by TEM imaging, XRDP, steady-state and time resolved fluorescence and phosphorescence measurements. No upconverted emission could be detected for the SBA samples because the mesoporous matrix offered a rigid location to the dyes resulting in aggregate and excimer-like species with modified electronic properties. On the other hand, TTA-UC was recorded on SNs samples; in the latter case, steady-state and time resolved phosphorescence and fluorescence measurements indicated that PtOEP was entrapped in monomeric form and TPPy was mainly present as monomer. The careful and detailed photophysical characterization of the obtained nanostructured materials enables the optimization of the conditions to achieve light upconversion in solid matrices. |
| Databáze: | OpenAIRE |
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