Hi Kamal,

It is tough to conclude anything important without seeing the actual spectra. If you attach the spectra here, it would be better to conclude something important. But remember, you are using 532 nm laser, which may not be good for collecting publishable Raman spectra of the CsPbBr3 samples because these samples are used to giving fluorescence at this excitation wavelength.

Best,

Aslam

Hi Karmal!

As previously stated it is very difficult to draw any conclusions without the spectrograms. Also, as Md Aslam Uddin stated, CsPbBr3 possesses a very strong photoluminescence near the wavelenght you used as excitation.

May be it would be useful for you to check this work,

Article In Situ Raman Spectroscopic Studies of Thermal Stability of ...

in which they use a 785 nm laser (to avoid the fluorescence problem) to characterize samples of the same material you are studing, although they have a different morphology.

I hope this can help you!

Best regards,

Daniel Gau.

Hello Kamal,

it is a very puzzling question! I hope you will find your answer soon. Since I would not expect those peaks from the material itself, I would double-check for possible artifacts, such as aliasing, spurious contribution from ambient illumination, or possible contaminants (some solvents from the crystallization or unreacted precursors maybe?)

Good luck!

Best,

Marcello