【摘要】 为了提高防伪的强度，提出了基于高亮度NaYF₄:Yb³⁺,Er³⁺材料的荧光防伪应用研究方法。首先，通过溶剂热法合成了晶相结构为六方相、形貌特征为长柱形、结晶度高、分散均匀、高亮度的NaYF₄:Yb³⁺,Er³⁺材料，并将其溶解在环己烷中形成透明溶液，作为荧光防伪所需的发光油墨。其次，使用环己烷溶液作为墨水在纸张上书写“J”“L”“N”“U”4个字符，发现在自然光下看不到纸张上的字符，但在980 nm近红外光的照射下，纸张上显示出明亮的绿色“J”“L”“N”“U”字符。由此可以推断，合成的高亮度NaYF₄:Yb³⁺,Er³⁺材料可以用于荧光防伪。实验表明，上述方法的防伪效果优于传统的条形码、二维码等防伪方式。更多还原

【Abstract】 In order to improve the strength of anti-counterfeiting, a research method of fluorescent anti-counterfeiting application based on high brightness NaYF₄:Yb³⁺,Er³⁺ materials is proposed. Firstly, NaYF₄:Yb³⁺,Er³⁺ materials with hexagonal crystal phase structure, long columnar morphology, high crystallinity, uniform dispersion and high brightness were synthesized by solvothermal method, and dissolved in cyclohexane to form a transparent solution as the luminous ink required for fluorescent anti-counterfeiting. Secondly, cyclohexane solution was used as ink to write four characters “J” “L” “N” and “U” on the paper. It was found that the characters could not be seen on the paper under natural light, but under the irradiation of 980 nm near-infrared light, the paper showed bright green characters “J” “L” “N” and “U”. It can be inferred that the synthesized high brightness NaYF₄:Yb³⁺,Er³⁺ materials can be used for fluorescent anti-counterfeiting. Experiments show that the anti-counterfeiting effect of the above method is better than the traditional anti-counterfeiting methods such as bar code and two-dimensional code.更多还原