Disintegration of Hexagonal NaYF4-Yb3+,Er3+ Upconverting Nanoparticles in Aqueous Media- The Role of Fluoride in Solubility Equilibrium - download at 4shared. Disintegration of Hexagonal NaYF4-Yb3+,Er3+ Upconverting Nanoparticles in Aqueous Media- The Role of Fluoride in Solubility Equilibrium is hosted at free file sharing service 4shared.