Title: Investigation of the Crystalline Emitting Layers Exhibiting Emission Facilitated by Triplet States for White Organic Light Emitting Diodes
Research proposal No: 1.1.1.9/LZP/1/24/140
Duration: 01.04.2025.-31.03.2028.
Project Leader: Oleksandr Bezvikonnyi
Total budget: EUR 184 140
ISSP UL budget: EUR 9207
Project description:
The biggest obstacle to the dominance of the technology of white organic light emitting diodes (WOLED) in the market of lighting and displays is low efficiency and stability. The project aims to develop efficient crystalline OLEDs. These devices will utilize emitters exhibiting crystallinity in emitting layers and triplet-facilitated emission. The phenomena like thermally activated delayed fluorescence (TADF), room temperature phosphorescence (RTP), etc. are prioritized as non-toxic, environmentally friendly approaches. State-of-the-art efficiency and stability will be pursued by using newly designed and synthesized crystalline organic semiconducting (COS) compounds with highly oriented dipoles, high drift mobility of charge carriers, and enhanced morphological features. Molecular packing of COS facilitated by crystallization in emitting layers will be used for the enhancement of the efficiency of WOLEDs with target values of 30% of external quantum efficiency (EQE) and color rendering index (CRI) of 90. The target values will be achieved by optimization of the device structure incorporating different emitting layers systems, transport layers, thickness of the layers to improve the charge balance, out-coupling and the quality of the white light.