IN347796: A lanthanum based upconverting microrods and application thereof

The invention provides a monodispersed lanthanum based upconverting microrods comprising (3 -NaYF4Yb3+, Er3+ and - NaYF4Yb3+, Tm3+, capped with oleic acid. The upconverting microrods, embedded in polymer matrices is used for making security  tags and for sensing application. The process of preparation, of the oleic acid capped upconverting microrods is also disclosed.