Issue 16, 2024

Time-dependent phosphorescence color of carbon dots in boric acid matrix for dynamic information encryption

Abstract

The ability to tune the color of time-dependent phosphorescence is very important. In this research, carbon dots (CDs) were synthesized with L-aspartic acid and boric acid through a one-step hydrothermal synthesis method. The CDs exhibit orange phosphorescence within 1 s after switching off 365-nm ultraviolet light and further change to green. The CDs have a long lifetime of 0.68 s and a quantum yield of 7.43%. By introducing halide ions into the CDs, CDs-X (X = F, Cl, or Br) have longer lifetimes of 0.83 s and higher quantum yields of 9.49%. However, the incorporation of iodine ions leads to a decrease in the quantum yield of the CDs and disappearance of the orange phosphorescence. This is because iodine ions expedite the carbonization process during the formation of CDs-I, resulting in a reduction in surface luminescent groups, thereby diminishing the quantum yield and orange phosphorescence of CDs-I and realizing regulation of the time-dependent phosphorescent color optical property of the carbon dots. Importantly, CDs and CDs-X (X = F, Cl, Br, or I) were successfully applied in anti-counterfeiting and multi-level dynamic phosphorescence color 3D coding information encryption.

Graphical abstract: Time-dependent phosphorescence color of carbon dots in boric acid matrix for dynamic information encryption

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
30 Jan 2024
Accepted
28 Feb 2024
First published
29 Feb 2024

J. Mater. Chem. C, 2024,12, 5849-5855

Time-dependent phosphorescence color of carbon dots in boric acid matrix for dynamic information encryption

X. Wang, S. Xie, L. Tao, M. Ouyang and X. Sun, J. Mater. Chem. C, 2024, 12, 5849 DOI: 10.1039/D4TC00431K

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