Organic Long Persistent Luminescence (OLPL) Material (No. 0165, 0166)

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An Organic Long Persistent Luminescence (OLPL) material provides a manufacturing and environmentally friendly solution for glow-in-the-dark materials.

The glow-in-the-dark market will see continued growth in the coming years owning to its increasing applications in various signage boards, consumer goods and bio-imaging. The glow-in-the-dark market is predicted to grow at a CAGR of 4.5% up to 2025. However, inorganic materials are mainly used as glow-in-the-dark materials for the above applications. These inorganic materials are not environmentally friendly, difficult to process for certain applications, and have a limited excitation band. Here we present a promising OLPL material developed by a group of researchers led by Prof. Ryota Kabe. The material is based on purely organic blended materials composed of electron donor and acceptor molecules which realizes an environmentally friendly and robust solution for many applications.

Lead Researcher:
Ryota Kabe

Faculty of Organic Optoelectronics Unit


  • Glow-in-the-dark paints and inks
  • Bioimaging



  • No rare metal materials
  • Soluble / ease of processing
  • Broad excitation / emission wavelength range

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Technology's Essence

The technology is based on a blend of organic donor and acceptor molecules that is free from rare elements and easy to fabricate. Specifically, this OLPL material, which is based on emission from excited complexes (exciplexes) upon the recombination of long-lived charge-separated states, can be excited by a standard white LED light source and generate long emission even at temperatures above 100 degrees Celsius. This OLPL material is transparent, soluble, and potentially flexible and color-tunable, opening new applications for LPL in large-area and flexible paints, biomarkers, fabrics, and windows.


Media Coverage and Presentations

  News: Casting light on glow-in-the-dark materials



  Graham Garner
Technology Licensing Section