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Issue 16, 2014
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Low-power photon upconversion in organic glasses

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Abstract

Green-to-blue upconverting molecular glasses consisting of a metal octaethylporphyrin (MOEP, M = Pd, Pt) sensitizer and 9-(4-hydroxymethylphenyl)-10-phenyl anthracene (DPA-CH2OH) as an emitter are reported. In these materials, incident light is transformed into higher-energy radiation by way of triplet–triplet annihilation upconversion. The DPA-CH2OH–MOEP mixtures form transparent glasses when cooled from the thermally stable melt, even at rates as low as 1 °C min−1. In a systematic study, the PdOEP concentration was varied from 0.025 to 6.6 mol%. The normalized upconverted light intensity decreased with increasing sensitizer concentration by almost three orders of magnitude, as a result of sensitizer aggregation. The upconverted light intensity also decreased upon deliberate crystallization of the upconverting materials. Beyond demonstrating the first embodiment of upconversion in molecular glasses, the results highlight the importance of morphology control in solid-state upconverting materials.

Graphical abstract: Low-power photon upconversion in organic glasses

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Publication details

The article was received on 13 Dec 2013, accepted on 03 Feb 2014 and first published on 07 Feb 2014


Article type: Communication
DOI: 10.1039/C3TC32473G
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. C, 2014,2, 2837-2841
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    Low-power photon upconversion in organic glasses

    R. Vadrucci, C. Weder and Y. C. Simon, J. Mater. Chem. C, 2014, 2, 2837
    DOI: 10.1039/C3TC32473G

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