Photophysics of detection of explosive vapours via luminescence quenching of thin films: impact of inter-molecular interactions

Shoaee, Safa, Fan, Shengqiang, Burn, Paul L. and Shaw, Paul E. (2016) Photophysics of detection of explosive vapours via luminescence quenching of thin films: impact of inter-molecular interactions. Physical Chemistry Chemical Physics, 18 37: 25861-25868. doi:10.1039/c6cp04536g


Author Shoaee, Safa
Fan, Shengqiang
Burn, Paul L.
Shaw, Paul E.
Title Photophysics of detection of explosive vapours via luminescence quenching of thin films: impact of inter-molecular interactions
Formatted title
Photophysics of detection of explosive vapours via luminescence quenching of thin films: impact of inter-molecular interactions
Journal name Physical Chemistry Chemical Physics   Check publisher's open access policy
ISSN 1463-9076
1463-9084
Publication date 2016-10-07
Year available 2016
Sub-type Article (original research)
DOI 10.1039/c6cp04536g
Open Access Status Not yet assessed
Volume 18
Issue 37
Start page 25861
End page 25868
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract Fluorescence-based detection of explosive analytes requires an understanding of the nature of the excited state responsible for the luminescence response of a sensing material. Many measurements are carried out to elucidate the fundamental photophysical properties of an emissive material in solution. However, simple transfer of the understanding gained from the solution measurements to the solid-state can lead to errors. This is in part due to the absence of inter-molecular interactions of the chromophores in solution, which are present in the solid-state. To understand the role of inter-molecular interactions on the detection of explosive analytes we have chosen dendrimers from two different families, D1 and D2, which allow facile control of the inter-molecular interactions through the choice of dendrons and emissive chromophores. Using ultrafast transient absorption spectroscopy we find that the solution photoinduced absorption (PA) for both materials can be explained in terms of the generation of singlet excitons, which decay to the ground state, or intersystem cross (ISC) to form a triplet exciton. In neat films however, we observe different photophysical behaviours; first, ISC to the triplet state does not occur, and second, depending on the chromophore, charge transfer and charge separated states are formed. Furthermore, we find that when either dendrimer is interfaced with analyte vapour, the singlet state is strongly quenched, generating a charge transfer state that undergoes geminate recombination.
Keyword Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DE120101721
DP130102422
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
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