@ Tyutrin, can elucidate further on what precisely you mean by "calculate" in your question? Are you referring to chemiluminescence, electro chemiluminescence or fluorescence? Your explanation would pave way to respond appropriately to your question.

Abubakar Abdussalam thank you for question! I want to know are there ways to obtain a theoretical curve of photoluminescence of color centers ?

There are so many programs to do the same like Microcal Origin, Specwin etc.

Hi Аlexander А. Tyutrin,

Different filters can be used in front of the PM tube during the experiment to obtain roughly information about the color centers of the experimentally obtained photoluminescence curve. Thus, you can easily draw the data against the wavelength.

I can say that this method is suitable for preliminary study. If you need a spectrum for further research, I suggest you do an x-ray luminescence analysis instead of simulating.