COATED UPCONVERSION NANOPARTICLES AND THEIR METHODS OF PREPARATION

摘要

There is disclosed a method of tuning the size, shape and fluorescence intensity of upconversion nanoparticles by the steps of (a) forming an upconversion nanoparticle with the chemical formula (I) MA1-xCxF4: Yby, Bz; and/or (b) coating the core upconversion nanoparticle with a composition (II): M'A'1-x'Lux'F4: Yby, B'z, to provide a core-shell nanoparticle, where M, M', A, A', x, x', y, y', B, B', z, z' and C are as defined herein.