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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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Multistage Stimulus-Responsive Room Temperature Phosphorescence Based on Host-Guest Doping Systems.

Yu Tian1, Jie Yang1, Zhenjiang Liu1

  • 1Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.

Angewandte Chemie (International Ed. in English)
|July 8, 2021
PubMed
Summary

Researchers developed a novel host-guest system for stimulus-responsive organic room temperature phosphorescence (RTP). This breakthrough brings advanced RTP materials closer to commercial applications through enhanced properties and printing techniques.

Keywords:
energy transferhost-guest doping systemsprintingroom temperature phosphorescentstimulus-responsive

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic room temperature phosphorescent (RTP) materials offer advantages over inorganic counterparts, including flexibility and tunable colors.
  • Development of commercially viable organic RTP materials remains a challenge.

Purpose of the Study:

  • To develop a new host-guest doping system exhibiting stimulus-responsive RTP characteristics.
  • To explore the potential of these materials for anti-counterfeiting applications.

Main Methods:

  • A host-guest system was designed using triphenylphosphine oxide (OPph3) as the host and benzo(dibenzo)phenothiazine dioxide derivatives as guests.
  • Turn-on RTP was achieved through co-crystallization or grinding, leveraging energy transfer and intersystem crossing (ISC).
  • Multistage stimulus-responsive RTP was engineered by incorporating a pyridine group into the guest molecule.

Main Results:

  • The developed host-guest system demonstrated efficient turn-on RTP.
  • Multistage stimulus-responsive RTP characteristics were achieved, responding to grinding and chemical stimuli.
  • Successful anti-counterfeiting printings were realized using stylus, thermal, and inkjet printing methods.

Conclusions:

  • The novel host-guest system provides a promising platform for developing advanced organic RTP materials.
  • The stimulus-responsive and printable nature of these materials advances their commercialization potential.
  • This work contributes to the field of functional organic materials for security and display applications.