On-Off switching of the phosphorescence signal in a carbon dot/polyvinyl alcohol composite for multiple data encryption

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

16 Scopus Citations
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Author(s)

  • Xin Bao
  • Enshan Liu
  • Zhengjie Zhou
  • Di Li
  • Ding Zhou
  • Songnan Qu

Detail(s)

Original languageEnglish
Pages (from-to)14250-14255
Journal / PublicationNanoscale
Volume11
Issue number30
Online published8 Jul 2019
Publication statusPublished - 14 Aug 2019

Abstract

Phosphorescence processes in composite systems based on luminescent carbon dots (CDs) are of great fundamental and practical interest. Herein, the control of the phosphorescent signal in a CD/polyvinyl alcohol (PVA) composite is realized. Enhanced green phosphorescence is obtained via thermal annealing of the composite under 200 °C, which can be quenched via water treatment, and then recovered again, via either repeated annealing or near-infrared laser irradiation. Water molecules infiltrating the CD/PVA composite lead to considerable vibrational motions of the CD surface groups through destruction of the rigid composite structure together with an increase in the possibility of the penetration of the phosphorescence quenchers, and thus a decrease in the phosphorescence intensity. After repeated annealing, the nonradiative transitions are restricted, and the phosphorescence signal is recovered again. Based on such on-off switching of the phosphorescence signal, a concept of multiple data encryption is realized by using the CD@PVA composite.

Research Area(s)

  • QUANTUM DOTS

Citation Format(s)

On-Off switching of the phosphorescence signal in a carbon dot/polyvinyl alcohol composite for multiple data encryption. / Bao, Xin; Ushakova, Elena V.; Liu, Enshan; Zhou, Zhengjie; Li, Di; Zhou, Ding; Qu, Songnan; Rogach, Andrey L.

In: Nanoscale, Vol. 11, No. 30, 14.08.2019, p. 14250-14255.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review