title: Electric-induced enhancement and modulation of upconversion photoluminescence in epitaxial BaTiO3:Yb/Er thin films.
authors.affiliation: Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong, China. apjhhao@inet.polyu.edu.hk
authors.forename: Jianhua
authors.initials: J
authors.lastname: Hao
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xianhua
authors.initials: X
authors.lastname: Wei