NaYF₄:Yb, Er with nitrogen-doped graphene quantum dots (N-GQDs) mixture was synthesized by a simple one-pot hydrothermal method. The as-obtained mixture shows green color under the irradiation of infrared light (980 nm), and exhibits blue color by means of ultraviolet excitation (365 nm). The luminescence of NaYF₄:Yb, Er and N-GQDs are not affected by each other. And the synthesized mixture directly incorporated into a polyvinyl alcohol (PVA) matrix can obtain a transparent luminescent film. The luminescent film also shows different luminescent colors under different light irradiation (980 nm or 365 nm). This result indicates that it has a potential application value in anti-counterfeiting packaging.

通过简单的一锅水热法合成了掺有氮掺杂石墨烯量子点（N-GQDs）的NaYF ₄：Yb，Er。所获得的混合物在红外光（980nm）的照射下显示绿色，并且通过紫外线激发（365nm）显示蓝色。NaYF ₄：Yb，Er和N-GQD的发光互不影响。并且，将直接掺入聚乙烯醇（PVA）基体中的合成混合物可以获得透明的发光膜。发光膜在不同的光照射（980nm或365nm）下也显示出不同的发光颜色。该结果表明其在防伪包装中具有潜在的应用价值。