Influence of pressure on electronic and optical properties of phosphorus-doped ZnO Ling-Ping Xiao, Xiao-Bin Li, Li Zeng and Xue Yang Eur. Phys. J. B, 91 2 (2018) 31 Published online: 07 February 2018 DOI: 10.1140/epjb/e2017-80379-9