Dear Chandra Kharvi ,

Have a look at (and the references indicated in this paper): Łapiński, M., Walas, M., Gapska, A., Kulik, D., Szmytke, A., Twardowski, P., Sadowski, W., & Kościelska, B. (2019). Structure and optical parameters of Eu doped tellurium oxide thin films prepared by reactive magnetron sputtering method. THIN SOLID FILMS, 691, 137592. https://doi.org/10.1016/j.tsf.2019.137592 . Although the title suggests otherwise, quite often the authors describe the results of the undoped material as well.

Hope this paper is of any help.

Best regards.

Thank You sir