![]() Theoretical calculations and mechanistic studies suggested that the sensing of Sn 2+ was attributed to the photoinduced electron transfer between Sn 2+ and N, B-CDs, and the limit of detection (LOD) was determined as 3.5 μM with the 3s/k rule. N, B-CDs have been successfully applied to detect Sn 2+ and gallic acid (GA). N, B-CDs contained many hydroxyl and amino groups on the surface, which can be utilized to detect specific ions and compounds. Graphic security and information encryption schemes were designed using N, B-CDs and rhodamine 6G. Due to their excellent phosphorescent properties, N, B-CDs have been successfully applied in information encryption. ![]() In the powder state, N, B-CDs exhibited bright blue fluorescence and stable green phosphorescence with a lifetime of 539 ms, visible to the naked eye for 9 s. In this work, easily accessible carbon dots (N, B-CDs) were synthesized via a one-step microwave method.
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