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An optical power limiting and ultrafast photophysics investigation of a series of multi-branched heavy atom substituted fluorene molecules

Lundén, Hampus ; Pitrat, Delphine ; Mulatier, Jean Christophe ; Monnereau, Cyrille ; Minda, Iulia LU ; Liotta, Adrien ; Chábera, Pavel LU ; Hopen, Didrik K. ; Lopes, Cesar and Parola, Stéphane , et al. (2019) In Inorganics 7(10).
Abstract

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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Excited state absorption, Optical power limiting, Reverse saturable absorption, Ultra-fast pump-probe spectroscopy
in
Inorganics
volume
7
issue
10
article number
126
publisher
MDPI AG
external identifiers
  • scopus:85074481463
ISSN
2304-6740
DOI
10.3390/inorganics7100126
language
English
LU publication?
yes
id
52cb4bc0-b518-492b-a048-51b75e45655b
date added to LUP
2019-11-26 12:56:09
date last changed
2023-09-23 18:55:49
@article{52cb4bc0-b518-492b-a048-51b75e45655b,
  abstract     = {{<p>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.</p>}},
  author       = {{Lundén, Hampus and Pitrat, Delphine and Mulatier, Jean Christophe and Monnereau, Cyrille and Minda, Iulia and Liotta, Adrien and Chábera, Pavel and Hopen, Didrik K. and Lopes, Cesar and Parola, Stéphane and Pullerits, Tönu and Andraud, Chantal and Lindgren, Mikael}},
  issn         = {{2304-6740}},
  keywords     = {{Excited state absorption; Optical power limiting; Reverse saturable absorption; Ultra-fast pump-probe spectroscopy}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  series       = {{Inorganics}},
  title        = {{An optical power limiting and ultrafast photophysics investigation of a series of multi-branched heavy atom substituted fluorene molecules}},
  url          = {{http://dx.doi.org/10.3390/inorganics7100126}},
  doi          = {{10.3390/inorganics7100126}},
  volume       = {{7}},
  year         = {{2019}},
}