Preparation of concealed marks with core-shell luminophores for customs security check system and application thereof
US11232696B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 30, 2021 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Jul 30, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y40/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Concealed mark preparation with core-shell luminosphores for customs security check system and application thereof, to address that infrared luminescent materials have not been used in senseless customs clearance field, absorption cross sections of infrared luminescent materials currently available are not big enough, and upconversion luminescence intensity thereof is low, consequently, the luminescent marks are not clear enough to recognize marked abnormal luggage, and provide a following solution: step 1: preparing TiQ2; step 2: preparing Ag@TiO2 composite nanoparticles; step 3: preparing Ag@TiQ2@NaYF4:Yb3+, Er3+ luminescent nanoparticles; step 4: making concealed luggage marks. Ag@TiQ2@NaYF4:Yb3+, Er3+ luminescent nanoparticles according to the present invention has superior luminescent intensity than pure NaYF4:Yb3+, Er3+, and luminescent materials prepared in this method can be disseminated in organic solution such as ethanol and methanol for use in preparing concealed marks to mark susceptible luggage and provides a research direction for senseless, intelligent and safe customs clearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.