Time-Dependent Phosphorescence Colors from Carbon Dots for Advanced Dynamic Information Encryption

被引：394

作者：

Tan, Jing ^{[1
]}

Li, Qijun ^{[2
,3
]}

Meng, Shuai ^{[1
]}

Li, Yuchen ^{[1
]}

Yang, Jian ^{[1
]}

Ye, Yunxia ^{[1
]}

Tang, Zikang ^{[3
]}

Qu, Songnan ^{[3
]}

Ren, Xudong ^{[1
]}

机构：

[1] Jiangsu Univ, Sch Mech Engn, Inst Micronano Optoelect & Terahertz Technol, Zhenjiang 212013, Jiangsu, Peoples R China

[2] Jiangsu Univ, Inst Energy Res, Zhenjiang 212013, Jiangsu, Peoples R China

[3] Univ Macau, Inst Appl Phys & Mat Engn, Minist Educ, Joint Key Lab, Macau 999078, Peoples R China

来源：

ADVANCED MATERIALS | 2021年 / 33卷 / 16期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

anti‐ counterfeiting; carbon dots; phosphorescence inks; time‐ dependent phosphorescence colors; QUANTUM DOTS; ORGANIC PHOSPHORESCENCE; SCALE SYNTHESIS; MECHANISM; STATE;

D O I：

10.1002/adma.202006781

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The development of phosphorescent materials with time-dependent phosphorescence colors (TDPCs) is of considerable interest for application in advanced dynamic information encryption. In this study, TDPC is realized in carbon dots (CDs) synthesized by the one-pot hydrothermal treatment of levofloxacin. CD ink printed on paper (CD@paper) exhibits a change in phosphorescence color from orange to green, 1 s after irradiation with 395 nm light. However, when irradiated with wavelengths shorter or longer than 395 nm, the CD@paper exhibits only green or red phosphorescence, respectively. The red and green phosphorescence originates from the low-energy surface oxide triplet state and high-energy N-related triplet state, respectively. When irradiated with a suitable light energy (around 395 nm wavelength), the two phosphorescent centers can be simultaneously activated, emitting red and green phosphorescence with different decay rates. The red and green phosphorescence merge into an orange phosphorescence initially, exhibiting the TDPC phenomenon. Based on the unusual phosphorescent properties of the CDs, a kind of multilevel, dynamic phosphorescence colored 3D code is designed for advanced dynamic information encryption.

引用

页数：7

共 47 条

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