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0225U004484,
(0124U002941)
,
Development of highly efficient light-emitting nanostructures based on quantum wells for red and near-infrared organic light-emitting devices. (QUANT).
Дослідження та налаштування ефективних нелегованих FR/NIR TADF світлодіодів з мультишаровими квантовими ямами
Stakhira Pavlo Yo., Доктор технічних наук
09-12-2025
Lviv Polytechnic National University
Development of highly efficient OLEDs based on quantum wells emitting light in the red and infrared spectral regions, as well as the study of physical features of radiative relaxation in low-dimensional 2D organic heterostructures formed on the basis of newly synthesized ambipolar emitters with organic barrier layers of commercially available wide-bandgap organic semiconductors.
The work includes comprehensive studies aimed at improving the efficiency of organic light-emitting diodes (OLEDs) by integrating quantum-well technologies and advanced mechanisms for controlling exciton dynamics. Red-emitting OLEDs based on the carbazole derivative 4CzTPN-Ph have been developed and studied in two structures: a doped host-guest system and structures with a triple cascade of quantum wells. It has been shown that the use of multilayer quantum wells provides effective charge localization and a characteristic sounding of the electroluminescent spectrum, which allows for the formation of spectrally purer red radiation (CIE 0.58, 0.33) and the effective use of the red-to-blue emission shift inherent in doped OLEDs. Also, OLEDs in the red spectral region were developed based on newly synthesized phenoxazine and diphenylamine derivatives, where the use of multiple quantum effects allowed to achieve an EQE increase of 63% compared to traditional structures. Emission with a maximum of 610 nm was obtained, and the efficiency was improved due to optimised exciton localisation. In addition, two highly efficient hyperfluorescent OLEDs (HF-OLEDs) with red-orange emission were created based on new donor-acceptor derivatives of 2,1,3-benzothiadiazole and fluorene, which contribute to intense photoluminescence in the solid state. Efficient FRET energy transfer from a commercial TADF sensitizer was confirmed, which provided low operating voltages (3.6 V and 3.9 V, respectively), brightness over 2800–3000 cd/m² and EQE up to 5.41%. The results obtained demonstrate the promise of an integrated approach that creates new organic materials with commercial organic semiconductors, quantum well technology, and hyperfluorescent mechanisms to create efficient red and near-infrared OLEDs.
Yaremchuk Iryna Ya.
Kutsiy Stepan A.
Kuzyk Nataliia I.
Lilia R. Deva
Krystyna Ivaniuk
2025-12-09
Updated: 2025-12-10
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