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Chalcogen atom modulated persistent room-temperature phosphorescence through intramolecular electronic coupling.

Letian Xu1, Guoping Li, Tao Xu

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Novel persistent room-temperature phosphorescence (pRTP) materials utilizing chalcogen atoms and carbazole were developed. These materials enable graphic encryption and sensitive detection of H2O2 and TNT, showcasing tunable phosphorescence properties.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Persistent room-temperature phosphorescence (pRTP) is crucial for advanced optical applications.
  • Developing novel pRTP materials with tunable properties remains a key challenge.
  • Carbazole derivatives are known for their optoelectronic properties.

Purpose of the Study:

  • To synthesize and characterize a series of novel persistent room-temperature phosphorescence (pRTP) materials.
  • To investigate the relationship between molecular structure and pRTP properties.
  • To explore the application of these materials in graphic encryption and chemical sensing.

Main Methods:

  • Synthesis of PEPCz materials incorporating O, S, Se, and Te atoms with a carbazolyl moiety.
  • Single crystal structure analysis to determine molecular conformation and crystal packing.
  • Spectroscopic and electrochemical methods to study intramolecular electronic coupling and pRTP mechanisms.
  • Application-based testing for graphic encryption and sensing of H2O2 and TNT.

Main Results:

  • A series of novel PEPCz materials exhibiting pRTP were successfully synthesized.
  • Similar molecular conformations and crystal packing were observed across the series.
  • Intramolecular electronic coupling between chalcogen atoms and π-units was identified as the source of tunable pRTP.
  • The PEPCz materials demonstrated potential for graphic encryption and sensitive detection of H2O2 and TNT.

Conclusions:

  • The study reports novel PEPCz materials with tunable pRTP properties.
  • Molecular design incorporating chalcogen atoms and carbazole is effective for achieving pRTP.
  • These materials show promise for applications in security and sensing technologies.