Patent ID: 11232696

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.