Usually, CZTS nanoparticles have a broad range of absorption extending to the edge of NIR region and I need to calculate the concentration of CZTS nanoparticles in the solution.
I guess it should not be so difficult to find it out!
I suggest you, to try Lambert–Beer's law: A/l (absorption per length)= alpha (extinction coefficient) X C (concentration).
A/L is the peak intensity, after subtracting the baseline or background. Now all you need to find out is the value of alpha for this particular kind of nanoparticles.
Good luck!
You probably do not have the fundamental constants for the absorption or emission process of your particles to be able to apply Beer's law directly. You will therefore need to do calibration experiments to generate your own Beer's law plot. You may find a serious limitation. The absorption and/or the emission may be too weak at dilute concentrations. Other methods may be required in those cases, such as a fluorescence spectrometer.
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