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A functional unit combination strategy for enhancing red room-temperature phosphorescence.

Shuaiqiang Zhao1, Zhiqiang Yang1, Xiangyu Zhang1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University Changchun 130012 China hcliu@jlu.edu.cn yangbing@jlu.edu.cn.

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|September 22, 2023
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Summary
This summary is machine-generated.

Researchers developed novel red organic materials for room-temperature phosphorescence (RTP). These materials, inspired by a jigsaw puzzle, show promise for advanced optical sensing applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Red room-temperature phosphorescence (RTP) organic materials are scarce compared to green emitters.
  • Developing novel non-metallic organic compounds for red RTP is crucial for advanced optical applications.

Purpose of the Study:

  • To design and synthesize novel organic molecules exhibiting red RTP.
  • To investigate the structure-property relationships influencing RTP emission.
  • To explore the potential of these materials in optical oxygen sensing.

Main Methods:

  • Molecular design integrating benzo[c][2,1,3]thiadiazole (BZT) as a red RTP unit and a folding unit to enhance spin-orbit coupling (SOC).
  • Synthesis of three new molecules: SS-BZT, SO-BZT, and OO-BZT.
  • Characterization of photophysical properties, including fluorescence and RTP emission in monodisperse films.
  • Evaluation of SS-BZT film performance in optical oxygen sensing.

Main Results:

  • SS-BZT and SO-BZT molecules with folded geometries exhibited enhanced red RTP compared to the parent BZT.
  • SS-BZT film displayed dual emission (blue fluorescence and red RTP) with a 150 nm spectral separation.
  • SS-BZT film showed high sensitivity and efficiency for optical oxygen sensing, with a quenching constant of 2.66 kPa⁻¹ and quenching efficiency of 94.24% within 0-1.31% oxygen concentration.

Conclusions:

  • The proposed jigsaw-puzzle-like molecular design effectively generates red RTP materials.
  • SS-BZT demonstrates significant potential for ratiometric detection and accurate oxygen sensing in hypoxic environments.
  • This work expands the library of red RTP organic materials and offers a new strategy for designing functional luminescent probes.