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Organic persistent room temperature phosphorescence enabled by carbazole impurity.

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|January 23, 2023
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Summary

Researchers designed novel metal-free organic phosphors for efficient persistent room-temperature phosphorescence (pRTP). Substituent effects on molecular geometry yielded high quantum yields and long excited-state lifetimes, crucial for advanced optoelectronic applications.

Keywords:
afterglowcarbazolecharge transferorganicpersistent room-temperature phosphorescence

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Designing metal-free organic phosphors is key for achieving persistent room-temperature phosphorescence (pRTP).
  • pRTP is a spin-forbidden process, posing challenges in molecular design.
  • Controlling molecular geometry is crucial for optimizing phosphorescent properties.

Purpose of the Study:

  • To synthesize and characterize novel halobenzonitrile-carbazoles.
  • To investigate the impact of halo- and cyano-substituents on molecular geometry and crystal packing.
  • To explore the photophysical properties, including pRTP and thermally activated delayed fluorescence (TADF).

Main Methods:

  • One-pot nucleophilic substitution protocol for synthesizing carbazole derivatives.
  • Crystallographic analysis to determine molecular geometry and packing.
  • Photophysical measurements (quantum yield, excited-state lifetime) to evaluate luminescence properties.

Main Results:

  • Synthesized a series of halobenzonitrile-carbazoles from commercial and lab-synthesized carbazoles.
  • Demonstrated that substituents influence carbazole moiety tilting/twisting in the crystal lattice.
  • Achieved efficient pRTP with high quantum yield (up to 22%) and long lifetime (up to 0.22 s) for compounds from commercial carbazoles.
  • Observed TADF with millisecond lifetimes for compounds from lab-synthesized carbazoles.

Conclusions:

  • Molecular design, specifically substituent effects on geometry, is critical for achieving efficient pRTP in metal-free organic phosphors.
  • The origin of luminescence is attributed to a mixed locally excited (3LE, nπ*)/charge transfer state.
  • The study provides insights into tailoring organic materials for advanced phosphorescence applications.