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Journal of Materials Science

, Volume 43, Issue 17, pp 5790–5796 | Cite as

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

  • Ilaria Menapace
  • Gabriela Mera
  • Ralf Riedel
  • Emre Erdem
  • Rüdiger-A. Eichel
  • Alberto Pauletti
  • Graham A. Appleby
Article

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.

Keywords

Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Free Carbon Electron Paramagnetic Resonance Measurement Spin Concentration 

Notes

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.

Supplementary material

10853_2008_2882_MOESM1_ESM.tif (338 kb)
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 (338 kb)
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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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Ilaria Menapace
    • 1
  • Gabriela Mera
    • 1
  • Ralf Riedel
    • 1
  • Emre Erdem
    • 2
  • Rüdiger-A. Eichel
    • 2
  • Alberto Pauletti
    • 3
  • Graham A. Appleby
    • 1
  1. 1.Institut für MaterialwissenschaftTechnische Universität DarmstadtDarmstadtGermany
  2. 2.Eduard-Zintl-InstitutTechnische Universität DarmstadtDarmstadtGermany
  3. 3.Laboratoire Chimie de la Matière Condensée, T54-55, E5Université Pierre et Marie Curie-Paris 6, 4 Place JussieuParis CedexFrance

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