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Int. J. Mol. Sci. 2012, 13(5), 5851-5865; doi:10.3390/ijms13055851
Article

Room-Temperature Fluorescence Lifetime of Pseudoisocyanine (PIC) J Excitons with Various Aggregate Morphologies in Relation to Microcavity Polariton Formation

1
, 1
, 1,2
 and 1,2,*
Received: 7 March 2012 / Revised: 12 April 2012 / Accepted: 3 May 2012 / Published: 15 May 2012
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Abstract

The results of room-temperature fluorescence lifetime measurements are reported for the excitation of J aggregates (Js) of pseudoisocyanine chloride (PIC-Cl) prepared in potassium polyvinyl sulfate (PVS) polymer thin films, their aqueous solutions, and NaCl aqueous solutions. Variations of the microscopic morphologies of the aggregates were investigated. The results show that fluorescence decay features correlated to the morphology change. The observed fluorescence lifetime and quantum efficiency of PIC J aggregates (PIC-Js) in a NaCl aqueous solution were 310 ps and 28%, respectively. The lifetime of the fibril-shaped macroaggregates prepared in PVS thin films was below the instrumental time resolution of 5 ps, and the efficiency decreased to below 3%. The results indicate that PIC-Js prepared with PVS polymers have an increased nonradiative contribution to the excitation deactivation process. In particular, macro-Js with isolated fibril-shaped structures revealed nonradiative pathway(s) that are closely associated to the specific packaging morphology of the constituent meso-Js. The possibility of a destructive effect on the formation of cavity-polaritons is also discussed.
Keywords: J aggregates; PIC-Cl; fluorescence decay time; fluorescence quantum efficiency; fibril-shaped macro-aggregates; Frenkel exciton; cavity polariton; dephasing J aggregates; PIC-Cl; fluorescence decay time; fluorescence quantum efficiency; fibril-shaped macro-aggregates; Frenkel exciton; cavity polariton; dephasing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Obara, Y.; Saitoh, K.; Oda, M.; Tani, T. Room-Temperature Fluorescence Lifetime of Pseudoisocyanine (PIC) J Excitons with Various Aggregate Morphologies in Relation to Microcavity Polariton Formation. Int. J. Mol. Sci. 2012, 13, 5851-5865.

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