Pseudoisocyanine J-Aggregate to Optical Waveguiding Crystallite Transition: Microscopic and Microspectroscopic Exploration
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- 作者：Alexander N. Lebedenko ; Gleb Ya. Guralchuk ; Alexander V. Sorokin ; Svetlana L. Yefimova ; Yuri V. Malyukin
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：September 14, 2006
- 年：2006
- 卷：110
- 期：36
- 页码：17772 - 17775
- 全文大小：594K
- 年卷期：v.110,no.36(September 14, 2006)
- ISSN：1520-5207
文摘
Using fluorescent microscopy and microspectroscopy, optical properties and morphology transformations inindividual pseudoisocyanine (PIC) J-aggregates in aqueous electrolyte solutions have been explored. A stringlikestructure of J-aggregates with a string diameter much less than 1 
m has been observed. Photodestruction ofthe strings under short-wavelength excitation has been revealed. Rodlike PIC crystallites, about 1 m indiameter, have been observed with time. The fluorescence spectrum of rodlike crystallites has been found todiffer from that of stringlike J-aggregate and from PIC crystal powder spectra. The crystallites are very stable,and their photodestruction has not been observed under any excitation conditions. It has been found thatrodlike crystallites in contrast to stringlike J-aggregates possess optical waveguide properties. The luminescenceof crystallites can be observed only at the excitation spot and at butt ends located up to hundreds of micrometersfrom the excitation spot.
m has been observed. Photodestruction ofthe strings under short-wavelength excitation has been revealed. Rodlike PIC crystallites, about 1 m indiameter, have been observed with time. The fluorescence spectrum of rodlike crystallites has been found todiffer from that of stringlike J-aggregate and from PIC crystal powder spectra. The crystallites are very stable,and their photodestruction has not been observed under any excitation conditions. It has been found thatrodlike crystallites in contrast to stringlike J-aggregates possess optical waveguide properties. The luminescenceof crystallites can be observed only at the excitation spot and at butt ends located up to hundreds of micrometersfrom the excitation spot.