Bright dual-mode green emission from selective set of dopant ions in β-Na(Y,Gd)F_4:Yb,Er/β-NaGdF_4:Ce,Tb core/shell nanocrystals

Bright dual-mode green emission from selective set of dopant ions in β-Na(Y,Gd)F_4:Yb,Er/β-NaGdF_4:Ce,Tb core/shell nanocrystals