Compositions and methods for upconverting luminescence with engineered excitation and applications thereof
AssigneeUniversity of Massachusetts
InventorsGang Han, Jie Shen
Life of this patent
Estimating the term…
Abstract
The invention generally relates to materials and methods for creating and/or utilizing upconverting luminescence. More particularly, the invention relates to novel compositions (e.g., nanoparticles) and related methods of preparation and use that enable upconverting luminescence with an efficient excitation optimized at about 800 nm. A unique class of cascade sensitized tri-doped UCNPs with a biocompatible 800 nm excitable property are disclosed herein, for example, tri-doped β-NaYF4:Nd,Yb,Er(Tm)/NaYF4 UCNPs, which employ Nd3+ as 800 nm photon sensitizer and Yb3+ as bridging ions, having strong green or blue upconversion emissions without photobleaching.
Claims6
An upconversion luminescence material characterized by a nano-structure in the form of nanoparticles having a core/shell/shell configuration comprising an inner shell and an outer shell in an epitaxial configuration, wherein comprising
- the core comprises β-NaYF4:Yb,Tm;
- the inner shell comprises β-NaYF4:Nd,Yb,Er or β-NaYF4:Nd,Yb,Tm;
- and
- the shell comprises β-NaYF4,
- wherein
- Nd is present at a mol % from about 0.1% to about 10%;
- Yb is present at a mol % from about 10% to about 80%;
- and
- Er or Tm is present at a mol % from about 0.1 to about 10%;
- and
- the upconversion luminescence material is characterized by a constitutional excitation peak away from 980 nm.
Dependencies are inferred from the claim text.