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<p>Long-persistent luminescence (LPL) materials have applications from safety signage to bioimaging; however, existing organic LPL (OLPL) systems do not align with human scotopic vision, which is sensitive to blue light. We present a strategy to blueshift the emissions in binary OLPL systems by upconverting the charge-transfer (CT) to a locally excited (LE) singlet state. Through rigorous steady-state and time-resolved photoluminescence spectroscopy and wavelength-resolved thermoluminescence measurements, we provide the direct experimental evidence for this upconversion in OLPL systems featuring small energy offsets between the lowest-energy CT and LE singlet states. These systems exhibited strong room temperature LPL, particularly when extrinsic electron traps are added. Importantly, the developed OLPL system achieved Class A (ISO 17398) LPL, matching well with human scotopic vision. The findings not only elucidate the role of small energy offsets in modulating LPL but also provide potential avenues for enhancing the efficiency and applicability of OLPL materials.</p>

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Blue organic long-persistent luminescence via upconversion from charge-transfer to locally excited singlet state

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月19日

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  • Zesen Lin,
  • Jinting Ye,
  • Shin Shinohara,
  • Yuya Tanaka,
  • Rengo Yoshioka,
  • Chin-Yiu Chan,
  • Yi-Ting Lee,
  • Xun Tang,
  • Kirill Mitrofanov,
  • Kai Wang,
  • Hayato Ouchi,
  • Liliia Moshniaha,
  • Yemineni S. L. V. Narayana,
  • Hisao Ishii,
  • Xiao-Hong Zhang,
  • Chihaya Adachi,
  • Xian-Kai Chen,
  • Ryota Kabe

摘要

Long-persistent luminescence (LPL) materials have applications from safety signage to bioimaging; however, existing organic LPL (OLPL) systems do not align with human scotopic vision, which is sensitive to blue light. We present a strategy to blueshift the emissions in binary OLPL systems by upconverting the charge-transfer (CT) to a locally excited (LE) singlet state. Through rigorous steady-state and time-resolved photoluminescence spectroscopy and wavelength-resolved thermoluminescence measurements, we provide the direct experimental evidence for this upconversion in OLPL systems featuring small energy offsets between the lowest-energy CT and LE singlet states. These systems exhibited strong room temperature LPL, particularly when extrinsic electron traps are added. Importantly, the developed OLPL system achieved Class A (ISO 17398) LPL, matching well with human scotopic vision. The findings not only elucidate the role of small energy offsets in modulating LPL but also provide potential avenues for enhancing the efficiency and applicability of OLPL materials.