According to my answer to your another question:

Dear Mr. Benali,

Your question is too vague and cannot answered correctly if you don't post any infos!!

Please start GOOGLE SCHOLAR  and   NOT GOOGLE (very important) and insert  : " doping of glass with copper".

You will earn 243.000 hits

I agree fully with the answer of Ivanova. Please upload and post your spectrum as jpg or pdf.

On other part, do you know the cut off of your glass and what a kind of UV-Vis spectrometer are you using (e.g single beam, dual beam , diode arrays...).

Please give  more infos about the chemical composition (Method?)  and method used for doping  with ccopper (salt a.s.o...)  or like in the following link:

Copper doping of silicate glasses by the ion-exchange technique: A photoluminescence spectroscopy study

E. Borsella1, A. Dal Vecchio1, M. A. Garcı̀a1, C. Sada1, F. Gonella2, R. Polloni2, A. Quaranta3 and L. J. G. W. van Wilderen4

+ VIEW AFFILIATIONS

J. Appl. Phys. 91, 90 (2002); http://dx.doi.org/10.1063/1.1421241

JRG

How to interpreted an UV-Visible spectra of silicated glass doped with copper, the chemical compositions are ( SiO2, Na2O, CaO and CuO)? - ResearchGate. Available from: https://www.researchgate.net/post/How_to_interpreted_an_UV-Visible_spectra_of_silicated_glass_doped_with_copper_the_chemical_compositions_are_SiO2_Na2O_CaO_and_CuO [accessed Aug 17, 2016].