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Organic long persistent luminescence.

Ryota Kabe1,2, Chihaya Adachi1,2,3

  • 1Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

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|October 3, 2017
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This summary is machine-generated.

Researchers developed a novel organic long persistent luminescence (OLPL) material using simple molecules. This rare-element-free OLPL system offers a transparent, flexible alternative to traditional inorganic glow-in-the-dark materials.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Long persistent luminescence (LPL) materials, commonly known as glow-in-the-dark substances, store and slowly release energy as light.
  • Current inorganic LPL materials, often strontium aluminum oxide-based, require rare elements and high-temperature fabrication, limiting transparency and applications.

Purpose of the Study:

  • To develop a novel organic LPL (OLPL) system free from rare elements and easy to fabricate.
  • To overcome the limitations of existing inorganic LPL materials, such as high fabrication temperatures and poor transparency.

Main Methods:

  • Fabrication of an OLPL system using two simple organic molecules.
  • Investigation of emission properties based on exciplex formation from long-lived charge-separated states.
  • Characterization of excitation and emission under standard white LED light at various temperatures.

Main Results:

  • The new OLPL system exhibits luminescence for over one hour at room temperature.
  • The organic system is transparent, soluble, and potentially flexible and color-tunable.
  • Luminescence is sustained even above 100 degrees Celsius, unlike previous organic systems.

Conclusions:

  • This rare-element-free OLPL system offers a promising alternative to inorganic LPL materials.
  • The transparency, flexibility, and tunable color open new applications in paints, biomarkers, fabrics, and windows.
  • The study advances understanding of long-lived charge separation in organic semiconductor devices.