Exploration of Room-Temperature Phosphorescence and New Mechanism on Carbon Dots in a Polyacrylamide Platform and their Applications for Anti-Counterfeiting and Information Encryption

Hui yong Wang, Lu Zhou, Hong mei Yu*, Xiao dan Tang, Christina Xing, Guochao Nie, Hussein Akafzade, Shao yan Wang*, Wei Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

This is the first report of full-color afterglow composites composed of four multicolored (blue, green, orange, and red) carbon dots (CDs) in polyacrylamide (PAM) matrix. Thus, adjustable four-color room-temperature phosphorescence (RTP) CDs@PAM composites are prepared on a PAM platform. The abundant amide groups in PAM are connected to the functional groups in CDs by hydrogen bonds, which promote the intersystem crossover and inhibit the non-radiative relaxation of triple states (T1) in CDs@PAM and effectively shield the quenching agents such as oxygen. Furthermore, the rigid hydrogen bond mesh structure is beneficial to the stability of T1 in CDs@PAM. In addition, the results of electron spin resonance reveal that the afterglow of CDs@PAM composites is not caused by oxygen defects and the increase of oxygen defects hinders the emission of phosphorescence. The CDs@PAM composites display not only multi-color fluorescence from blue to red, but also display full-color RTP emission from blue to red with average phosphorescence lifetime in the range of 637–478.97 ms. These composites, in addition to the full-color RTP performance, are promising for multi-color pattern anti-counterfeiting and information encryption.

Original languageEnglish
Article number2200678
JournalAdvanced Optical Materials
Volume10
Issue number15
DOIs
Publication statusPublished - 4 Aug 2022
Externally publishedYes

Keywords

  • carbon dots
  • composite materials
  • hydrogen bonds
  • polyacrylamide
  • room-temperature phosphorescence

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