Controllable structural and optical properties of NaYF4:Tm, Yb microparticles by Yb<sup>3+</sup> doping for anti-counterfeiting
Vuong Thanh Tuyen, Bui Quang Huy, Nguyen Ba Tong, Tran Thi Ngoc Lam, Maurizio Ferrari, Cao Thi My Dung, Ung Thi Dieu Thuy, Thi Thanh Van Tran
Abstract
a power-dependent luminescence study. The results show that the crystal phases and luminescence properties of the NaYF4:Tm, Yb UCMPs are controlled by changing the Yb doping concentration. The printed patterns are readable under the excitation of a 980 nm LED. Moreover, the zeta potential analysis shows that the UCMPs after surface oxidation are water dispersible. In particular, the naked eye can observe the enormous upconversion emissions in UCMPs. These findings indicated that this fluorescent material is an ideal candidate for anti-counterfeiting and biological applications.
Topics & Concepts
DopingMaterials scienceNanotechnologyOptoelectronicsChemical engineeringEngineeringLuminescence Properties of Advanced MaterialsOptical properties and cooling technologies in crystalline materialsInorganic Fluorides and Related Compounds