Preparation method and application of infrared luminescent material hidden mark

Abstract

The invention discloses a preparation method and application of an infrared luminescent material hidden mark. The preparation method comprises the following steps: 1, selection of a matrix material; 2, adjusting of the concentration of rare earth doped ions; 3, magnetic stirring; 4, heating by a hydrothermal method; 5, controlling of the particle form; 6, cooling and centrifugal separation; 7, washing with water and ethanol; 8, drying and grinding; and 9, spraying marks. The NaYF4: Yb3+, Er3+ microrod-like nano material with high luminous intensity can be prepared by adjusting the ion concentration and the hydrothermal temperature, and the infrared luminescent material is sprayed on the surface of security inspection luggage to form a hidden mark, so that opportunistic capture is facilitated; and meanwhile, the method is used for criminal investigation sites, fingerprints are displayed in the application form of small-particle suspension liquid, and the defects that dust is raised through a powder method, the environment is polluted, and damp or bubble objects cannot be displayed are overcome.

Description

technical field [0001] The invention relates to the field of marking, in particular to a preparation method and application of an infrared luminescent material concealed marking. Background technique [0002] Up-conversion luminescence means that a substance absorbs light with long wavelength and low frequency, and emits light with short wavelength and high frequency. Infrared luminescent material is an up-conversion luminescent material that emits visible light under the excitation of infrared light. The current preparation of infrared luminescent materials has very high requirements on the environmental conditions of the reaction, and the preparation conditions are complicated, and some infrared luminescent materials based on oxyfluoride, sulfide and other systems are harmful to the environment to a certain extent, and have different The degree of toxicity is not conducive to the physical and mental health of the staff, and the stability of the prepared infrared luminescen...

AI Technical Summary

Problems solved by technology

The current preparation of infrared luminescent materials has very high requirements on the environmental conditions of the reaction, and the preparation conditions are complicated, and some infrared luminescent materials based on oxyfluoride, sulfide and other systems are harmful to the environment to a certain extent, and have different The degree of toxicity is not conducive to the physical and mental health of the staff, and the stability of the prepared infrared luminescent material is not high enough

[0003] For customs security inspection and evidence collection at the scene of criminal investigation, there is a lack of effective means of displaying marks, which is not conducive to the precise and effective attack on suspects who have stolen goods and obtained them

Images