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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Red Room Temperature Phosphorescence from Lignin.

Hongda Guo1,2, Huanjie Cheng3, Ruixia Liu1,2

  • 1Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 24, 2024
PubMed
Summary
This summary is machine-generated.

Sustainable red room-temperature phosphorescence (RTP) materials were created from lignin. Modified lignin (Lig-Upy) exhibits tunable red RTP, enabling applications in anti-counterfeiting and visual displays.

Keywords:
LigninMultiple hydrogen bondsRed RTP materialsTDPCs

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Sustainable Chemistry

Background:

  • Developing red room-temperature phosphorescence (RTP) materials from sustainable sources is a significant challenge.
  • Lignin, a renewable biopolymer, offers potential but requires functionalization for advanced optical properties.

Purpose of the Study:

  • To synthesize novel red RTP materials from lignin.
  • To investigate the impact of chemical modification on lignin's phosphorescent properties.
  • To explore the potential of these materials in applications like anti-counterfeiting.

Main Methods:

  • Covalent modification of lignin with Upy (1-(6-isocyanatohexyl)-3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl) urea) to create Lig-Upy.
  • Characterization of Lig-Upy's photophysical properties, including RTP emission wavelength and lifetime.
  • Embedding Lig-Upy into different matrices (PVA, MTM) to study matrix-dependent property variations.

Main Results:

  • Lig-Upy demonstrated red RTP centered at 625 nm with a long lifetime of 24.2 ms.
  • The Upy modification enhanced intermolecular interactions and reduced energy gaps in lignin.
  • Embedding Lig-Upy in PVA and MTM matrices resulted in tunable RTP wavelengths and lifetimes.
  • Developed time-dependent phosphorescent color (TDPC) materials from Lig-Upy.

Conclusions:

  • Lignin can be effectively functionalized to produce sustainable red RTP materials.
  • The tunable phosphorescence of Lig-Upy opens avenues for advanced optical applications.
  • TDPC materials derived from Lig-Upy show promise for visual decoration, information encryption, and anti-counterfeiting.