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

<< Back to all technologies


Glow-in-the-dark materials are widely employed in applications such as emergency signage, bioimaging and consumer goods. The inorganic materials currently used as glow-in-the-dark materials are not environmentally friendly, are difficult to process for certain applications and have a limited excitation band. A team of OIST researchers led by Prof. Ryota Kabe has developed a novel, fully organic long persistent luminescence (OLPL) material. This material is transparent and soluble, and can be readily processed into flexible thin films. The luminescence color can be adjusted through the addition of organic dopants. The robust and flexible composition of this material can reduce the cost and environmental impact of existing glow-in-the-dark products, as well as open up new applications e.g. as flexible films/paints for large areas and as biomarkers.

Lead Researcher:
Ryota Kabe

Faculty of Organic Optoelectronics Unit


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



  • Free of rare metal materials
  • Soluble and easy to process
  • Broad excitation and emission wavelength range
  • Tunable color

OIST’s novel OLPL material can be processed into a transparent thin film

The color of the material can be changed by adding dopants


This novel OLPL material is based on a blend of organic donor and acceptor molecules which is free from rare elements and is easy to fabricate and process, as it is soluble and as such does not require high processing temperatures. The luminescence arises from the emission from excited complexes (exciplexes) upon the recombination of long-lived charge-separated states. The material can be excited by a standard white LED light source and generates long-lasting emission even at temperatures above 100 degC.


Media Coverage and Presentations

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



  Graham Garner
Technology Licensing Section