Preparation method and application of fluorescent material readable under flashlight

Abstract

The invention discloses a preparation method of a fluorescent material readable under a flashlight. The method comprises the following steps: synthesizing silicon quantum dots; mixing mica in a hydrochloric acid solution with a mass concentration of 2 to 3 percent, wherein the content of mica is 3 to 5 g / mL, and stirring for 20 to 30 min at the temperature of 60 to 80 DEG C; preparing the processed mica into 10 to 13 percent by weight of mica pulp, and blending for 20 to 30 min at the temperature of 70 to 80 DEG C; adjusting the pH of the reaction system to 1.8 to 2.2 by virtue of hydrochloric acid; dropwise adding a sodium hydroxide solution, and adjusting a pH value to 9; adding praseodymium nitrate and the silicon quantum dots into the system, ultrasonically dispersing, wherein the addition amount of the praseodymium nitrate is 0.2 to 0.4 mg / mL, the addition amount of the silicon quantum dots is 0.7 to 1 mg / mL, and the dispersing time is 5 to 10 min, thus obtaining a precursor; and placing the precursor into a muffle furnace at a working current of 8 to 10 A, increasing the temperature at a speed of 5 to 10 DEG C per min to 800 to 1000 DEG C, and preserving the heat for 1 to 2 hours. When the fluorescent material prepared by the scheme is illuminated under the flashlight of a mobile phone, the emitted light is red, and the fluorescent intensity is improved by 30 percent or more compared to the situation of not adding the silicon quantum dots.

Description

technical field [0001] The present application relates to the technical field of security and anti-counterfeiting, in particular to a preparation method and application of a fluorescent material readable under a flash lamp. Background technique [0002] Today, with the surge in information volume, the security and accurate identification of information has become a topic of widespread concern in society. Existing security identification technologies generally have various technical defects such as complex production process, high price, poor precision, easy cracking, instability, and susceptibility to interference from external factors, which can no longer meet the needs of the development of information security in today's society. Taking two-dimensional barcodes as an example, the printed content can be seen intuitively, and can be easily copied using a readily available desktop copier or printing machine. [0003] Using anti-counterfeiting inks to form security marks to ...

AI Technical Summary

Problems solved by technology

Existing security identification technologies generally have various technical defects such as complex production process, high price, poor precision, easy cracking, instability, and susceptibility to interference from external factors, which can no longer meet the needs of the development of information security in today's society