Organic long persistent luminescence

Ryota Kabe, Chihaya Adachi

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Long persistent luminescence (LPL) materials - widely commercialized as 'glow-in-the-dark' paints - store excitation energy in excited states that slowly release this energy as light. At present, most LPL materials are based on an inorganic system of strontium aluminium oxide (SrAl 2 O 4) doped with europium and dysprosium, and exhibit emission for more than ten hours. However, this system requires rare elements and temperatures higher than 1,000 degrees Celsius during fabrication, and light scattering by SrAl 2 O 4 powders limits the transparency of LPL paints. Here we show that an organic LPL (OLPL) system of two simple organic molecules that is free from rare elements and easy to fabricate can generate emission that lasts for more than one hour at room temperature. Previous organic systems, which were based on two-photon ionization, required high excitation intensities and low temperatures. By contrast, our OLPL system - 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 system is transparent, soluble, and potentially flexible and colour-tunable, opening new applications for LPL in large-area and flexible paints, biomarkers, fabrics, and windows. Moreover, the study of long-lived charge separation in this system should advance understanding of a wide variety of organic semiconductor devices.

Original languageEnglish
Article number24010
JournalNature
Volume550
Issue number7676
DOIs
Publication statusPublished - Oct 19 2017

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Luminescence
Paint
Dysprosium
Europium
Temperature
Strontium
Semiconducting organic compounds
Excitation energy
Aluminum Oxide
Biomarkers
Semiconductor devices
Excited states
Light scattering
Powders
Transparency
Ionization
Light emitting diodes
Light sources
Photons
Color

All Science Journal Classification (ASJC) codes

  • General

Cite this

Organic long persistent luminescence. / Kabe, Ryota; Adachi, Chihaya.

In: Nature, Vol. 550, No. 7676, 24010, 19.10.2017.

Research output: Contribution to journalArticle

Kabe, Ryota ; Adachi, Chihaya. / Organic long persistent luminescence. In: Nature. 2017 ; Vol. 550, No. 7676.
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