First-principles study of the electronic structure and optical properties of Eu2+ and Mn2+-doped NaLi3SiO4 phosphorZhengxian Liu, Jiaolian Luo, Anqi Yang, Zhenyu Xie, Lifang He and Mingzhao TanEur. Phys. J. B, 97 12 (2024) 209DOI: https://doi.org/10.1140/epjb/s10051-024-00839-5