title: A novel approach from infrared to ultraviolet emission enhancement in Yb3+, Er3+:CaF2 nanofilms.
abstract: Under 978 nm excitation, we explored the infrared-to-ultraviolet upconversion properties in the nanofilms with the nanoparticles of Yb3+, Er3+ codoped calcium fluoride (CaF2:Yb3+, Er3+). The strong enhancement of ultraviolet emission was observed. The result is attributed to the optical performance characteristics of the nanostructure materials. Furthermore, a novel upconversion approach explains well the UV-enhanced emission.
authors.affiliation: Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, PR China.
authors.forename: Jisen
authors.initials: J
authors.lastname: Zhang
authors.forename: Weiping
authors.initials: W
authors.lastname: Qin
authors.forename: Jishuang
authors.initials: J
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Cao
authors.forename: Ye
authors.initials: Y
authors.lastname: Jin
authors.forename: Guodong
authors.initials: G
authors.lastname: Wei
authors.forename: Guofeng
authors.initials: G
authors.lastname: Wang
authors.forename: Lili
authors.initials: L
authors.lastname: Wang