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Unicolored phosphor-sensitized fluorescence for efficient and stable blue OLEDs

Author

Listed:
  • Paul Heimel

    (InnovationLab
    TU Braunschweig
    BASF SE)

  • Anirban Mondal

    (Max Planck Institute for Polymer Research)

  • Falk May

    (BASF SE
    Merck KGaA)

  • Wolfgang Kowalsky

    (InnovationLab
    TU Braunschweig)

  • Christian Lennartz

    (InnovationLab
    BASF SE
    trinamiX GmbH)

  • Denis Andrienko

    (Max Planck Institute for Polymer Research)

  • Robert Lovrincic

    (InnovationLab
    TU Braunschweig)

Abstract

Improving lifetimes and efficiencies of blue organic light-emitting diodes is clearly a scientific challenge. Towards solving this challenge, we propose a unicolored phosphor-sensitized fluorescence approach, with phosphorescent and fluorescent emitters tailored to preserve the initial color of phosphorescence. Using this approach, we design an efficient sky-blue light-emitting diode with radiative decay times in the submicrosecond regime. By changing the concentration of fluorescent emitter, we show that the lifetime is proportional to the reduction of the radiative decay time and tune the operational stability to lifetimes of up to 320 h (80% decay, initial luminance of 1000 cd/m2). Unicolored phosphor-sensitized fluorescence provides a clear path towards efficient and stable blue light-emitting diodes, helping to overcome the limitations of thermally activated delayed fluorescence.

Suggested Citation

  • Paul Heimel & Anirban Mondal & Falk May & Wolfgang Kowalsky & Christian Lennartz & Denis Andrienko & Robert Lovrincic, 2018. "Unicolored phosphor-sensitized fluorescence for efficient and stable blue OLEDs," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07432-2
    DOI: 10.1038/s41467-018-07432-2
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    Cited by:

    1. Pode, Ramchandra, 2020. "Organic light emitting diode devices: An energy efficient solid state lighting for applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).

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