Related Experiment Video
Updated: May 21, 2025
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Liquid PEG and PEGDA as Protective Matrices for TTA-UC Functioning in Air and Their Application in Information
Shigang Wan1, Dongxuan Wang1, Yizhong Shi1
1School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China.
Abstract:
Photochemical deoxygenation offers a promising solution to the oxygen sensitivity issue in Triplet-triplet annihilation upconversion (TTA-UC). This study utilized polyethylene glycol (PEG)-200 and polyethylene glycol diacrylate (PEGDA)-575 as solvents and singlet oxygen scavengers for TTA-UC conducted in air. The upconversion efficiency of Pt(OEP)/DPA in aerated PEG-200 is similar to that in nitrogen-saturated PEG-200. Prolonged 532 nm light irradiation causes a PEGDA-575 solution of Pt(OEP)/DPA to undergo photoinitiated polymerization via homomolecular TTA, leading to a reduction in DPA's upconversion emission and an increase in Pt(OEP)'s phosphorescence. These results enabled the development of a high-level information encryption platform using the direct-writing method with Pt(OEP)/DPA/PEGDA-575 or Pt(OEP)/DPA/PEGDA-575/PEG-200 ink. The information is only readable under certain lighting conditions or at specific times and can be erased by exposure to light.
