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Related Experiment Video

Updated: May 15, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
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Ionic iridium complex and conjugated polymer used to solution-process a bilayer white light-emitting diode.

Michele Sessolo1, Daniel Tordera, Henk J Bolink

  • 1Instituto de Ciencia Molecular, Universidad de Valencia, ES-46980 Paterna (Valencia), Spain.

ACS Applied Materials & Interfaces
|January 19, 2013
PubMed
Summary

Solution-processed bilayer devices achieve white light emission using distinct phosphorescent and fluorescent materials. Layer thickness tuning enables efficient color control for diverse white light applications.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Development of efficient white light-emitting devices is crucial for solid-state lighting.
  • Solution-processable organic materials offer cost-effective fabrication routes.
  • Combining phosphorescent and fluorescent emitters presents challenges in material compatibility and processing.

Purpose of the Study:

  • To develop a facile method for fabricating bilayer white light-emitting devices (WLEDs).
  • To investigate the use of orthogonal solvents for direct deposition of distinct emitter layers.
  • To demonstrate color tuning capabilities in solution-processed WLEDs.

Main Methods:

  • Preparation of bilayer WLEDs using an ionic orange phosphorescent organometallic complex and a neutral fluorescent conjugated polymer.

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  • Utilizing orthogonal solvents to enable direct deposition of the blue emitter onto the orange emitter layer.
  • Controlled adjustment of individual layer thicknesses to tune the emitted light spectrum.

    • Main Results:

    • Successful fabrication of bilayer WLEDs through a simple solution-processing technique.
    • Demonstrated compatibility of ionic and neutral organic materials due to orthogonal solvent solubility.
    • Achieved tunable white light emission by precisely controlling the thickness of the emissive layers.

    Conclusions:

    • Solution-processed bilayer WLEDs can be efficiently fabricated using materials with orthogonal solubility.
    • This approach simplifies device fabrication by eliminating the need for cross-linking or specialized coatings.
    • Precise control over layer thickness allows for effective color tuning, enabling versatile white light generation.