公开(公告)号：US20190218410A1

公开(公告)日：2019-07-18

申请号：US16248371

申请日：2019-01-15

Applicant: SOUTH DAKOTA BOARD OF REGENTS

Inventor： WILLIAM CROSS ,  JEEVAN MERUGA ,  JON KELLAR ,  P. STANLEY MAY ,  ARAVIND BARIDE

IPC: C09D11/50 ,  C09D11/38 ,  C09D11/322 ,  C09D11/023 ,  C09D11/037 ,  C09K11/77 ,  B41M3/14

CPC classification number: C09D11/50 ,  B41M3/144 ,  C09D11/023 ,  C09D11/037 ,  C09D11/322 ,  C09D11/38 ,  C09K11/7773

Abstract: The present technology relates generally to a stable oil-in-water emulsion containing upconverting nanoparticles. In particular, the present technology relates to an ink formulation comprising a stable oil-in-water emulsion of upconverting nanoparticles useful for security printing. Preferably the upconverting nanoparticles comprise a β-Na(RE)F4 nanoparticle, wherein RE is a lanthanide, yttrium, or a combination or mixture thereof.