Publication date: 22nd July 2026
OLEDs typically have active layer thicknesses below 200 nm. This makes the incorporation of photonic structures within the device architecture challenging as these structures are generally thicker than 200 nm. Solution processed polymer based LEDs and vacuum deposited multilayer organic LEDs, have different advantages and challenges with respect to the incorporation of nanophotonic structures.
We will report on different strategies to incorporate nanophotonic structures in OLEDs with the aim to obtain circularly polarized electroluminescence. The nanophotonic structures are prepared using a PDMS stamp on large areas.[3] These nanophotonic structures are modified with a thin transparent conductive oxide using pulsed laser deposition. The enables there use as nanophotonic substrates for the preparation of OLEDs. For the OLEDs, both solvent processed polymer based emitters and vacuum sublimed phosphorescent emitters are evaluated. As an alternative approach, top emitting OLEDs are prepared on which the nanophotonic structures are applied. In both these approaches we observe circularly polarized light under electrical excitation. The maximum values we observed are gEL = 0.2 as a result of the excellent compatibility of the nanophotonic nanostructures and the vacuum sublimated fabrication of OLEDs.
References:
1. M. Forzatti, et al., Organic Light-Emitting Diodes Comprising an Undoped Thermally Activated Delayed Fluorescence Emissive Layer and a Thick Inorganic Perovskite Hole Transport Layer. ACS Photonics. 11, 4151-4160 (2024)
2. Mendoza-Carreño, J. et al. A single nanophotonic platform for producing circularly polarized white light from non-chiral emitters. Nat. Commun. 15, 10443 (2024).
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