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Article

An Optical Power Limiting and Ultrafast Photophysics Investigation of a Series of Multi-Branched Heavy Atom Substituted Fluorene Molecules

1
FOI, Swedish Defence Research Agency, Olaus Magnus väg 42, 583 30 Linköping, Sweden
2
IFM-Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden
3
Laboratoire de Chimie, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, F69342, Cedex 07 Lyon, France
4
The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
5
Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Inorganics 2019, 7(10), 126; https://doi.org/10.3390/inorganics7100126
Received: 17 September 2019 / Revised: 10 October 2019 / Accepted: 15 October 2019 / Published: 18 October 2019
A common molecular design paradigm for optical power limiting (OPL) applications is to introduce heavy atoms that promote intersystem crossing and triplet excited states. In order to investigate this effect, three multi-branched fluorene molecules were prepared where the central moiety was either an organic benzene unit, para-dibromobenzene, or a platinum(II)–alkynyl unit. All three molecules showed good nanosecond OPL performance in solution. However, only the dibromobenzene and Pt–alkynyl compounds showed strong microsecond triplet excited state absorption (ESA). To investigate the photophysical cause of the OPL, especially for the fully organic molecule, photokinetic measurements including ultrafast pump–probe spectroscopy were performed. At nanosecond timescales, the ESA of the organic molecule was larger than the two with intersystem crossing (ISC) promoters, explaining its good OPL performance. This points to a design strategy where the singlet-state ESA is balanced with the ISC rate to increase OPL performance at the beginning of a nanosecond pulse. View Full-Text
Keywords: optical power limiting; excited state absorption; reverse saturable absorption; ultra-fast pump–probe spectroscopy optical power limiting; excited state absorption; reverse saturable absorption; ultra-fast pump–probe spectroscopy
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MDPI and ACS Style

Lundén, H.; Pitrat, D.; Mulatier, J.-C.; Monnereau, C.; Minda, I.; Liotta, A.; Chábera, P.; Hopen, D.K.; Lopes, C.; Parola, S.; Pullerits, T.; Andraud, C.; Lindgren, M. An Optical Power Limiting and Ultrafast Photophysics Investigation of a Series of Multi-Branched Heavy Atom Substituted Fluorene Molecules. Inorganics 2019, 7, 126. https://doi.org/10.3390/inorganics7100126

AMA Style

Lundén H, Pitrat D, Mulatier J-C, Monnereau C, Minda I, Liotta A, Chábera P, Hopen DK, Lopes C, Parola S, Pullerits T, Andraud C, Lindgren M. An Optical Power Limiting and Ultrafast Photophysics Investigation of a Series of Multi-Branched Heavy Atom Substituted Fluorene Molecules. Inorganics. 2019; 7(10):126. https://doi.org/10.3390/inorganics7100126

Chicago/Turabian Style

Lundén, Hampus, Delphine Pitrat, Jean-Christophe Mulatier, Cyrille Monnereau, Iulia Minda, Adrien Liotta, Pavel Chábera, Didrik K. Hopen, Cesar Lopes, Stéphane Parola, Tönu Pullerits, Chantal Andraud, and Mikael Lindgren. 2019. "An Optical Power Limiting and Ultrafast Photophysics Investigation of a Series of Multi-Branched Heavy Atom Substituted Fluorene Molecules" Inorganics 7, no. 10: 126. https://doi.org/10.3390/inorganics7100126

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