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Luminescence of heat-treated silicon-based polymers: promising materials for LED applications

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Abstract

A new strategy to obtain transparent, thermally stable, and formable photoluminescent materials for LED applications is presented. Starting from commercially available silicon-based polymers, luminescence properties are developed by means of simple heat treatment. Solid polymethylsilsesquioxane MK (Wacker-Besil®PMS MK) and liquid poly(ureamethylvinyl)silazane Ceraset (Kion Ceraset® PUVMS) were thermally treated between 200 and 700 °C for 2 h under Ar atmosphere. Photoluminescence properties were observed in all the samples. The structural rearrangements during thermal annealing were effective in order to red-shift the emission spectra of the untreated polymers to the visible range. The formation of dangling bonds and carbon sp2, associated with the annealing procedure and confirmed by means of Electron Paramagnetic Resonance (EPR) spectroscopy and solid state Magic Angle Spinning NMR (MAS-NMR) contribute to the red-shift of the photoluminescence emissions of the polymers. After heat treatment at low temperatures (200, 300, and 400 °C), both the polymers show fluorescence in the UV range. While the polysiloxane reveals white luminescence after annealing at 500 and 600 °C, the polysilazane heat-treated at 500 °C exhibits emission in the blue-green range and is transparent. At higher temperatures the presence of free carbon counteracts the luminescence properties.

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Acknowledgements

The authors thank the European Community FP6 (MCRTN-019601, PolyCerNet), the Deutsche Forschungsgemeinschaft, Bonn, Germany (DFG-NSF research initiative), and the Fonds der Chemischen Industrie, Frankfurt, Germany for financial support. The authors acknowledge also the company Kion Inc., USA, for providing CerasetTM and Dr. Ute Liepold, Siemens AG, Munich, for fruitful discussions related to luminescence properties.

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Authors and Affiliations

  1. Institut für Materialwissenschaft, Technische Universität Darmstadt, Petersenstr. 23, Darmstadt, 64287, Germany

    Ilaria Menapace, Gabriela Mera, Ralf Riedel & Graham A. Appleby

  2. Eduard-Zintl-Institut, Technische Universität Darmstadt, Petersenstr. 20, Darmstadt, 64287, Germany

    Emre Erdem & Rüdiger-A. Eichel

  3. Laboratoire Chimie de la Matière Condensée, T54-55, E5, Université Pierre et Marie Curie-Paris 6, 4 Place Jussieu, 75252, Paris Cedex, France

    Alberto Pauletti

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  1. Ilaria Menapace
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  2. Gabriela Mera
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Correspondence to Ilaria Menapace.

Electronic supplementary material

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10853_2008_2882_MOESM1_ESM.tif

Additional information 1: Emission spectra (360 nm excitation) (bottom right) and excitation spectra (for maximum emission) (top left) of MK at different temperatures MOESM1 (TIFF 337 kb)

10853_2008_2882_MOESM2_ESM.tif

Additional information 2: Emission spectra (360 nm excitation) (bottom right) and excitation spectra (for maximum emission) (top left) of Ceraset at different temperatures MOESM2 (TIFF 337 kb)

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Menapace, I., Mera, G., Riedel, R. et al. Luminescence of heat-treated silicon-based polymers: promising materials for LED applications. J Mater Sci 43, 5790–5796 (2008). https://doi.org/10.1007/s10853-008-2882-9

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  • DOI: https://doi.org/10.1007/s10853-008-2882-9

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