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Get it white: color-tunable AC/DC OLEDs

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Author(s)

Markus Froebel, Tobias Schwab, Mona Kliem, Simone Hofmann, Karl Leo, Malte C. Gather

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Abstract

Organic light-emitting diodes (OLEDs) have gained considerable attention because of their use of inherently flexible materials and their compatibility with facile roll-to-roll and printing processes. In addition to high efficiency, flexibility and transparency, reliable color tunability of solid state light sources is a desirable feature in the lighting and display industry. Here, we demonstrate a device concept for highly efficient organic light-emitting devices whose emission color can be easily adjusted from deep-blue through cold-white and warm-white to saturated yellow. Our approach exploits the different polarities of the positive and negative half-cycles of an alternating current (AC) driving signal to independently address a fluorescent blue emission unit and a phosphorescent yellow emission unit which are vertically stacked on top of each other. The electrode design is optimized for simple fabrication and driving and allows for two-terminal operation by a single source. The presented concept for color-tunable OLEDs is compatible with application requirements and versatile in terms of emitter combinations.

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Original languageEnglish
Article numbere247
Number of pages6
JournalLight: Science & Applications
Volume4
DOIs
Publication statusPublished - Feb 2015

    Research areas

  • Alternating current, Color mixing, Color tuning, Vertical stacking, White organic light-emitting devices, Light-emitting-diodes, Top electrodes, Devices, Efficiency, Emission, Voltage, Frequency, Cells, Layer

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