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Copper(I) Complexes for Thermally Activated Delayed Fluorescence: From Photophysical to Device Properties

  • Markus J. Leitl
  • Daniel M. Zink
  • Alexander Schinabeck
  • Thomas Baumann
  • Daniel Volz
  • Hartmut Yersin
Review
Part of the following topical collections:
  1. Photoluminescent Materials and Electroluminescent Devices

Abstract

Molecules that exhibit thermally activated delayed fluorescence (TADF) represent a very promising emitter class for application in electroluminescent devices since all electrically generated excitons can be transferred into light according to the singlet harvesting mechanism. Cu(I) compounds are an important class of TADF emitters. In this contribution, we want to give a deeper insight into the photophysical properties of this material class and demonstrate how the emission properties depend on molecular and host rigidity. Moreover, we show that with molecular optimization a significant improvement of selected emission properties can be achieved. From the discussed materials, we select one specific dinuclear complex, for which the two Cu(I) centers are four-fold bridged to fabricate an organic light emitting diode (OLED). This device shows the highest efficiency (of 23 % external quantum efficiency) reported so far for OLEDs based on Cu(I) emitters.

Keywords

Thermally activated delayed fluorescence TADF Phosphorescence Fluorescence OLED Emitter Triplet harvesting Singlet harvesting Emission properties Electroluminescence Cu(I) Copper 

Notes

Acknowledgments

The authors thank the German Ministry for Education and Research (BMBF) for funding in the scope of the cyCESH project (FKN 13N12668). The authors (T.B., D.V., D.M.Z.) gratefully acknowledge the collaboration with the groups of Prof. Franky So (NCSU), Prof. Christopher Barner-Kowollik (KIT), Prof Clemens Heske (KIT, UNLV), Prof. Uli Lemmer (KIT), and Prof. Stefan Bräse (KIT), as well as the scientific division of CYNORA.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Markus J. Leitl
    • 1
  • Daniel M. Zink
    • 2
  • Alexander Schinabeck
    • 1
  • Thomas Baumann
    • 2
  • Daniel Volz
    • 2
  • Hartmut Yersin
    • 1
  1. 1.Institut für Physikalische Chemie, Universität RegensburgRegensburgGermany
  2. 2.Cynora GmbHBruchsalGermany

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