Molecular near-infrared triplet-triplet annihilation upconversion with eigen oxygen immunity

Xinyu Wang, Fangwei Ding, Tao Jia, Feng Li, Xiping Ding, Ruibin Deng, Kaifeng Lin, Yulin Yang, Wenzhi Wu, Debin Xia () and Guanying Chen ()
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Xinyu Wang: Harbin Institute of Technology
Fangwei Ding: Harbin Institute of Technology
Tao Jia: Harbin Institute of Technology
Feng Li: Harbin Institute of Technology
Xiping Ding: Harbin Institute of Technology
Ruibin Deng: Harbin Institute of Technology
Kaifeng Lin: Harbin Institute of Technology
Yulin Yang: Harbin Institute of Technology
Wenzhi Wu: Heilongjiang University
Debin Xia: Harbin Institute of Technology
Guanying Chen: Harbin Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Molecular triplet-triplet annihilation upconversion often experiences drastic luminescence quenching in the presence of oxygen molecules, posing a significant constraint on practical use in aerated conditions. We present an oxygen-immune near-infrared triplet-triplet annihilation upconversion system utilizing non-organometallic cyanine sensitizers (λex = 808 nm) and chemically synthesized benzo[4,5]thieno[2,3-b][1,2,5]thiadiazolo[3,4-g]quinoxaline dyes with a defined dimer structure as annihilators (λem = 650 nm). This system exhibits ultrastable upconversion under continuous laser irradiance (>480 mins) or extended storage (>7 days) in aerated solutions. Mechanistic investigations reveal rapid triplet-triplet energy transfer from sensitizer to annihilators, accompanied by remarkably low triplet oxygen quenching efficiencies ( $${\eta }_{{{{\mbox{O}}}}_{2}}$$ η O 2

Date: 2024
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DOI: 10.1038/s41467-024-46541-z

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