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Electromagnetic Mode Management in Transparent DMD Electrodes for High Angular Color Stability in White OLEDs.
Claudia Triolo1, Antonella Lorusso2,3, Sofia Masi4
1Department of Civil, Energy, Environmental and Materials Engineering (DICEAM), Mediterranean University, Via Zehender, Loc. Feo di Vito, Reggio Calabria 89122, Italy.
ACS Photonics
|May 29, 2025
Summary
Optimizing dielectric/metal/dielectric (DMD) electrodes improves transparent OLEDs. This research enhances transmittance and color stability for wide viewing angles, enabling advanced transparent lighting solutions.
Area of Science:
- Optoelectronics
- Materials Science
Background:
- Transparent organic light-emitting diodes (OLEDs) require precise optical management of dielectric/metal/dielectric (DMD) electrodes.
- Chromatic stability of white OLEDs across viewing angles is a challenge due to wavelength-dependent internal reflections.
Purpose of the Study:
- To analyze the optical behavior of DMD structures using Variable Angle Spectroscopic Ellipsometry.
- To optimize the transmittance and viewing angle performance of DMD-based transparent white OLEDs.
Main Methods:
- Variable Angle Spectroscopic Ellipsometry (VASE) was employed for optical analysis.
- Investigated optical modes contributing to power dissipation in DMD structures.
Main Results:
- Reduced plasmonic and waveguided modes correlate with enhanced antireflection properties of DMD electrodes.
- Achieved significant improvements in transmittance across the visible spectrum.
- Demonstrated enhanced color stability for white OLED emission over a 120° viewing cone.
Conclusions:
- Optimized DMD electrodes are key to high-performance transparent white OLEDs.
- This work facilitates the development of next-generation transparent lighting sources with superior optical characteristics.
