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<p>The excited triplet state characteristics of diphenylanthracene (4,4'-(anthracene-9,10-diyl)dibenzoic acid: DCDPA<sup>2−</sup>), a water-soluble triplet–triplet annihilation-based photon upconversion emitter molecule, were investigated. The excited triplet state of DCDPA<sup>2−</sup> (<sup>3*</sup>DCDPA<sup>2−</sup>) was generated by triplet-sensitized energy transfer reactions using water-soluble anionic porphyrin (tetra(4-sulfonatophenyl)porphyrinatopalladium: PdTPPS<sup>4−</sup>). The characteristic transient absorption spectra of the excited triplet state of PdTPPS<sup>4−</sup> (<sup>3*</sup>PdTPPS<sup>4−</sup>) were observed within the 120-µs region. In time regions above 120&#xa0;µs, different transient absorption spectra appeared at 400–520&#xa0;nm and were attributed to <sup>3*</sup>DCDPA<sup>2−</sup>. Based on the decay analyses, the lifetime of <sup>3*</sup>DCDPA<sup>2−</sup> was determined as 1.61&#xa0;ms.</p> Graphical abstract <p></p>

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Excited triplet state characteristics of 4,4'-(anthracene-9,10-diyl) dibenzoic acid for photon upconversion molecules in water

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Tatsuto Yui,
  • Tomoaki Miura,
  • Yuki Nakadai,
  • Hibiki Umezawa,
  • Akikazu Izumi,
  • Hiroki Saito,
  • Momoka Shirai,
  • Tadaaki Ikoma

摘要

The excited triplet state characteristics of diphenylanthracene (4,4'-(anthracene-9,10-diyl)dibenzoic acid: DCDPA2−), a water-soluble triplet–triplet annihilation-based photon upconversion emitter molecule, were investigated. The excited triplet state of DCDPA2− (3*DCDPA2−) was generated by triplet-sensitized energy transfer reactions using water-soluble anionic porphyrin (tetra(4-sulfonatophenyl)porphyrinatopalladium: PdTPPS4−). The characteristic transient absorption spectra of the excited triplet state of PdTPPS4− (3*PdTPPS4−) were observed within the 120-µs region. In time regions above 120 µs, different transient absorption spectra appeared at 400–520 nm and were attributed to 3*DCDPA2−. Based on the decay analyses, the lifetime of 3*DCDPA2− was determined as 1.61 ms.

Graphical abstract