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Experimentally Observed Reverse Intersystem Crossing-Boosted Lasing.

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Thermally activated delayed fluorescence (TADF) materials enable efficient organic lasers by converting triplet states to radiative singlets via reverse intersystem crossing (RISC). This process boosts lasing intensity with increasing temperature and allows for high-repetition-rate microlasers.

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organic lasersreverse intersystem crossingtemperature-dependent lasingthermally activated delayed fluorescencetriplet-harvesting

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Organic Electronics

Background:

  • Thermally activated delayed fluorescence (TADF) materials offer a pathway to overcome triplet-related losses in organic lasers.
  • Experimental demonstration of triplet contributions to lasing has been limited due to incomplete understanding of excited-state dynamics.

Purpose of the Study:

  • To experimentally demonstrate reverse intersystem crossing (RISC)-boosted lasing in organic microspheres utilizing TADF emitters.
  • To investigate the role of triplet-to-singlet conversion in stimulated emission and population inversion for organic lasers.

Main Methods:

  • Fabrication of organic microspheres uniformly dispersed with TADF emitters.
  • Experimental investigation of excited-state processes, including reverse intersystem crossing (RISC).
  • Analysis of lasing intensity and excited-state population dynamics as a function of temperature.

Main Results:

  • Achieved RISC-boosted lasing by continuously converting triplet excitons to radiative singlets.
  • Observed thermally activated lasing, where intensity increases with temperature due to efficient population inversion.
  • Demonstrated suppression of triplet accumulation, enabling a high-repetition-rate microlaser.

Conclusions:

  • Reverse intersystem crossing (RISC) is crucial for enhancing lasing performance in TADF materials.
  • The findings provide experimental evidence for triplet state utilization in electrically driven organic lasers.
  • This work paves the way for developing efficient and high-performance organic microlasers.