Two-photon fluorescence spectroscopy of individually trapped pseudoisocyanine J-aggregates in aqueous solution

Yoshito Tanaka, Hiroyuki Voshikawa*, Hiroshi Masuhara

*Corresponding author for this work

研究成果: Article同行評審

39 引文 斯高帕斯(Scopus)

摘要

We have investigated a pseudoisocyanine dye aqueous solution including nanometer-sized J-aggregates by combining optical trapping and two-photon fluorescence spectroscopy. By focusing an intense near-infrared laser into an 8 × 10-3 M solution, the intense fluorescence from J-aggregates for a few to tens of seconds is observed intermittently, indicating that individual J-aggregates are trapped in and diffuse out from a focal spot. The peak position and full width at half-maximum of the J-band are different from each other. By measuring 171 J-aggregates, it was found that J-aggregates can be classified largely into two groups. The existence of two kinds of groups of J-aggregates could be attributed to the difference in the nucleation process, which is affected by the substrate. J-aggregates possessing a J-band of a narrower bandwidth in a shorter wavelength region are trapped for a longer period of time, indicating that highly ordered J-aggregates are trapped for a longer period of time because of their high polarizability.

原文English
頁(從 - 到)17906-17911
頁數6
期刊Journal of Physical Chemistry B
110
發行號36
DOIs
出版狀態Published - 14 九月 2006

指紋 深入研究「Two-photon fluorescence spectroscopy of individually trapped pseudoisocyanine J-aggregates in aqueous solution」主題。共同形成了獨特的指紋。

引用此