Thin Film Deposition: Carbazole Molecular Glasses Color Change

EL AALLAOUI Najla
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Homework Statement
Hi everyone,I hope you are doing well.
I am trying to get a thin film of molecular glasses based carbazole , and during the deposition with physical vapor deposition I notice that the color change from brum to black liquid then we get a yellow thin film .
Please could you help me the understand what's happen ?
Thank you in advance for your interest.
Relevant Equations
don't have
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The color of thin film is strongly affected by interference of light.
 
Here is a mini lecture on the topic.

 
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