Continuous Condensed Triplet Accumulation for Irradiance‐Induced Anticounterfeit Afterglow
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- Ende Hopsah Badriyah
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
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- Kikuya Hayashi
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
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- Bahadur Sk
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
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- Rina Takano
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
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- Takayuki Ishida
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
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- Shuzo Hirata
- Department of Engineering Science The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182–8585 Japan
説明
<jats:title>Abstract</jats:title><jats:p>Afterglow room‐temperature emission that is independent of autofluorescence after ceasing excitation is a promising technology for state‐of‐the‐art bioimaging and security devices. However, the low brightness of the afterglow emission is a current limitation for using such materials in a variety of applications. Herein, the continuous formation of condensed triplet excitons for brighter afterglow room‐temperature phosphorescence is reported. (<jats:italic>S</jats:italic>)‐(‐)‐2,2′‐Bis(diphenylphosphino)‐1,1′‐binaphthyl ((<jats:italic>S</jats:italic>)‐BINAP) incorporated in a crystalline host lattice showed bright green afterglow room‐temperature phosphorescence under strong excitation. The small triplet–triplet absorption cross‐section of (<jats:italic>S</jats:italic>)‐BINAP in the whole range of visible wavelengths greatly suppressed the deactivation caused by Förster resonance energy transfer from excited states of (<jats:italic>S</jats:italic>)‐BINAP to the accumulated triplet excitons of (<jats:italic>S</jats:italic>)‐BINAP under strong continuous excitation. The steady–state concentration of the triplet excitons for (<jats:italic>S</jats:italic>)‐BINAP reached 2.3 × 10<jats:sup>−2</jats:sup> M, producing a bright afterglow. Owing to the brighter afterglow, afterglow detection using individual particles with sizes approaching the diffraction limit in aqueous conditions and irradiance‐dependent anticounterfeiting can be achieved.</jats:p>
収録刊行物
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- Advanced Science
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Advanced Science 10 (36), 2023-10-28
Wiley
