title: Tuning Upconversion Emission of β-NaGdF4:Yb+/Ho3+ Nanorods Through Yb3+.
abstract: Yb3+/Ho3+ doped hexagonal NaGdF4 nanocrystals are synthesized through solvothermal method, for which pure hexagonal phased nanorods are presented. The concentration influence of Yb3+ ions on the sample morphology and fluorescence emission of Ho3+ is investigated. It is found that the sample size is changed from 25 nm to 125 nm and the upconversion emission is tuned from green to yellow when the concentration of Yb3+ ions is increased from 5.0 mol% to 50.0 mol%. The possible upconversion mechanism and the improvement of crystallinity are carefully investigated. It is suggested that the cross-relaxation process between Ho3+ ions promotes the red emission and quenches the green emission.
authors.forename: Fangqi
authors.initials: F
authors.lastname: Gao
authors.forename: Wei
authors.initials: W
authors.lastname: Gao
authors.forename: Ruibo
authors.initials: R
authors.lastname: Wang
authors.forename: Longxiang
authors.initials: L
authors.lastname: Yan
authors.forename: Jinping
authors.initials: J
authors.lastname: Li
authors.forename: Hairong
authors.initials: H
authors.lastname: Zheng
mesh_terms: D003116:Color; D005453:Fluorescence; D008027:Light; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size