Unicolored phosphor-sensitized fluorescence for efficient and stable blue OLEDs

Paul Heimel, Anirban Mondal, Falk May, Wolfgang Kowalsky, Christian Lennartz, Denis Andrienko () and Robert Lovrincic ()
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Paul Heimel: InnovationLab
Anirban Mondal: Max Planck Institute for Polymer Research
Falk May: BASF SE
Wolfgang Kowalsky: InnovationLab
Christian Lennartz: InnovationLab
Denis Andrienko: Max Planck Institute for Polymer Research
Robert Lovrincic: InnovationLab

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-07432-2

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