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Experimentally Observed Reverse Intersystem CrossingâBoosted Lasing
- Source :
- Angewandte Chemie. 132:21861-21866
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Thermally activated delayed-fluorescent (TADF) materials are anticipated to overcome triplet-related losses towards electrically driven organic lasers. Thus far, contributions from triplets to lasing have not yet been experimentally demonstrated owing to the limited knowledge about the excited-state processes. Herein, we experimentally achieve reverse intersystem crossing (RISC)-boosted lasing in organic microspheres with uniformly dispersed TADF emitters. In these materials, triplets are continuously converted to radiative singlets through RISC, giving rise to reduced losses in stimulated emission. The involvement of regenerated singlets in population inversion results in a thermally activated lasing; that is, the lasing intensity increases with increasing temperature, accompanied by accelerated depletion of the excited-state population. Benefiting from the suppression of triplet accumulations by RISC processes, a high-repetition-rate microlaser was achieved.
- Subjects :
- education.field_of_study
Organic laser
Materials science
010405 organic chemistry
Population
Physics::Optics
General Chemistry
General Medicine
010402 general chemistry
Laser
Population inversion
01 natural sciences
Molecular physics
Catalysis
0104 chemical sciences
law.invention
Intersystem crossing
law
Radiative transfer
Stimulated emission
education
Lasing threshold
Subjects
Details
- ISSN :
- 15213757 and 00448249
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie
- Accession number :
- edsair.doi.dedup.....3dc784e9593fb2687bad7686c2a55686