Can you help me please,
How can I make sure about the formation J-aggregation of (PIC) dye on solid substrate by Langmuir-Blodgett technique?
Is there any other way except uv-visible absorption spectroscopy?
Thank you so much Dr. Ivanova,
My dye is "1,1′-Diethyl-2,2′-cyanine iodide" or Pseudocyanine dye, it has absorption peak of J-aggregate in about 580nm.
I recorded the fluorescence spectra of my thin films (12 layers of dye by Langmuir-Blodgett) today, but I couldn’t record any peak or signal. I think it is because of the high intensity of the pump laser and I should record this spectra by microscope and in very low intensity of pump laser. Today I used 405 nm laser diode for pumping.
what are your opinions?
Ms Asgari,
i found this articel, may be it is helpful for your porblem:
"
Absorption and emission studies on pure and mixed J-aggregates of pseudoisocyanine
HenkFidder
https://doi.org/10.1016/j.chemphys.2007.06.016
"
Do you have an absorption or excitation spectra of the thin films (12 layers of dye by Langmuir-Blodgett)? So you can check if you're using the right wavelength for the excitation.
I suggest you create an even thinner layer, if possible, because in my experience the molecules reduce fluorescence by interacting with each other.
What is your solid substrate ? Glass?
Thank you so much,
This article is very helpful,
I tried many times but I can't record any obvious absorption spectra (in UV-visible) of my samples, so I recorded the ATR of my samples, the results are attached, what is your opinion about them?
and how many layers do you think is better for that?
my substrate is 40nm gold on polycarbonate 1D grating.
with regards.
I can recommend very interesting paper in this field
Egorov VV. 2017 Nature of
the optical band shapes in polymethine dyes
and H-aggregates: dozy chaos and excitons.
Comparison with dimers, H*- and
J-aggregates. R. Soc. open sci. 4: 160550.
http://dx.doi.org/10.1098/rsos.160550
Mrs/Miss Asgari,
The uploaded spectra are IR. These are completely different spectroscopies. There was question about your Fs spectra. Can you upload them?
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