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Photo-physical properties and triplet-triplet absorption of platinum(II) acetylides in solid PMMA matrices
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2009 (English)In: Nonlinear Optics and Applications III, SPIE - International Society for Optical Engineering, 2009, 73540H- p.Conference paper (Refereed)
Abstract [en]

Because of their strong nonlinear optical properties, Platinum(II) acetylides are investigated as potential chromophores for optical power limiting (OPL) applications. The strong excited state absorption and efficient intersystem crossing to the triplet states in these materials are desired properties for good OPL performance. We recently reported on OPL and photo-physical properties of Pt(II)-acetylide chromophores in solution, modified with thiophenyl or triazole groups. [R. Westlund et al. J. Mater. Chem. 18, 166 (2008); E. Glimsdal et al. Proc. SPIE 6740, 67400M (2007)] The chromophores were later incorporated into poly(methyl-methacrylate) (PMMA) glasses. A variety of doped organic solids were prepared, reaching concentrations of up to 13 wt% of the guest molecule. Raman spectra of the doped solid devices proved that the chemical structure of the nonlinear dyes remains intact upon the polymerization of the solid matrix. Luminescence spectra confirm that the basic photo-physical properties (absorption, emission and inter-system crossing) observed for the solute molecules in THF are maintained also in the solid state. In particular, the phosphorescence lifetime stays in the order of μs to ms, just as in the oxygen evacuated liquid samples. Also, the wavelength dependence and time-dynamics of the triplet absorption spectra of the dyes, dissolved in THF solution and dispersed in solid PMMA matrices, were investigated and compared. Ground state UV absorption spectra between 300 and 420 nm have corresponding broad band visible triplet-triplet absorption between 400 and 800 nm. The triplet state extinction coefficients were determined to be in the order of 104 M-1cm-1.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2009. 73540H- p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 7354
Keyword [en]
Optical power limiting, Platinum(II) acetylides, PMMA, Transient spectroscopy, Triazoles, Triplet states
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Other Physics Topics
URN: urn:nbn:se:kth:diva-153582DOI: 10.1117/12.820645ISI: 000299794000009ScopusID: 2-s2.0-69949146692ISBN: 978-081947628-9OAI: diva2:753475
Nonlinear Optics and Applications III, 20 April 2009 through 22 April 2009, Prague, Czech Republic

QC 20141008

Available from: 2014-10-08 Created: 2014-10-06 Last updated: 2014-10-08Bibliographically approved

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Westlund, Robert
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