Researchers develop new thermally activated delayed fluorescence (TADF) materials

New thermally activated delayed fluorescence (TADF) materials developed
Credit: Osaka University

An international joint research group has succeeded in developing a new thermally activated, delayed-fluorescence (TADF) material that displays emission of light in colors from green to deep-red.

Through a detailed optical property investigation of this material, this group also confirmed that TADF was achieved through intersystem crossing (ISC) from the singlet excited state (1CT) to the triplet excited state (3LEA), a world first.

In addition, the external quantum efficiency (EQE) of the organic EL devices manufactured by using these newly developed TADF materials in their emitting layer reached 16 percent, greatly surpassing 5 percent, the limiting value obtained by conventional fluorescent materials.

These results will contribute to the research and development of white TADF emitting devices for indoor and outdoor use through combination with TADF materials that emit light in shorter wavelengths (deep blue ~ yellow) which are currently being developed all over the world.

This research was published in the of Angewandte Chemie International Edition on April 6, 2016 (Germany time).

  • New thermally activated delayed fluorescence (TADF) materials developed
    Credit: Osaka University
  • New thermally activated delayed fluorescence (TADF) materials developed
    Credit: Osaka University
  • New thermally activated delayed fluorescence (TADF) materials developed
    Credit: Osaka University

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More information: Przemyslaw Data et al. Dibenzo[]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters, Angewandte Chemie International Edition (2016). DOI: 10.1002/anie.201600113
Provided by Osaka University
Citation: Researchers develop new thermally activated delayed fluorescence (TADF) materials (2016, June 30) retrieved 17 September 2019 from https://phys.org/news/2016-06-thermally-fluorescence-tadf-materials.html
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