Developing anti-counterfeiting technique with rich information encrypted by cheap, eco-friendly and stable photoluminescent materials is useful yet challenging. Herein, we present the application of graphene quantum dots (GQDs) for full-color and stimuli-responsive information encryption. GQDs with red, green and blue (RGB) fluorescence or ion-responsiveness are prepared based on scalable bottom-up molecular fusion in one-step hydrothermal or solvothermal reaction. Printable fluorescent ink is easily prepared by dispersing GQDs homogeneously in glycerol-containing ethanol. Utilizing the color, pattern, characteristic fluorescence emission spectrum, or stimuli-responsive emission of GQDs, information encryption under daylight and information decryption under UV light are realized. Moreover, N and S co-doped GQDs (N, S-GQDs), which have Cu²⁺-quenchable and cysteine (Cys)-recoverable blue fluorescence, are mixed with lanthanide complex (Eu³⁺DP) to realize order-sensitive stimulus-responsive information encryption.

用廉价，环保和稳定的光致发光材料加密具有丰富信息的防伪技术是有用的，但也具有挑战性。本文中，我们介绍了石墨烯量子点（GQD）在全色和刺激响应信息加密中的应用。在一步式水热或溶剂热反应中，基于可扩展的自下而上的分子融合，可以制备具有红色，绿色和蓝色（RGB）荧光或离子响应性的GQD。通过将GQDs均匀分散在含甘油的乙醇中，可以轻松制备可印刷的荧光墨水。利用GQD的颜色，图案，特征荧光发射光谱或刺激响应发射，实现了日光下的信息加密和UV光下的信息解密。此外，N和S共掺杂的GQD（N，S-GQD）具有Cu^将2+可猝灭和半胱氨酸（Cys）可恢复的蓝色荧光与镧系元素络合物（Eu ³⁺ DP）混合，以实现顺序敏感的刺激响应信息加密。