NaYF4:Yb3+,Tm3+ inverse opal photonic crystals and NaYF4:Yb3+,Tm3+/TiO2 composites: synthesis, highly improved upconversion properties and NIR photoelectric response†
Abstract
A novel solvent-thermal Y2O3 template method was explored to synthesise NaYF4:Yb3+,Tm3+ inverse opal photonic crystals (IOPCs), which show highly improved up-conversion luminescence properties.