Search academic texts

Information × Registration Number 0224U001777, 0121U107533 , R & D reports Title Tandem organic LEDs with high quantum efficiency based on ultra-thin emission layers with energy transfer from the explex popup.stage_title Head Baryshnikov Hlib V., Registration Date 30-01-2024 Organization Bohdan Khmelnytsky National University of Cherkasy popup.description2 The research object is ultra-thin films of organic emissive materials with predetermined properties, which are characterized by a high photoluminescence quantum yield, a narrow photo- and electroluminescence spectrum, color purity, and long photoluminescence decay times; inorganic films based on colloidal nanoparticles as transport and emission layers. The aim is to establish the relationship between the electronic structure and photophysical characteristics of new emission materials and to implement ergonomic and energy-efficient organic and hybrid tandem heterostructures based on ultra-thin emission layers with energy transfer from exciplex that would meet TSO and Energy Star standards. Results and novelty. The regularities of the relationship between the electronic structure and the structure of the crystal packing and the spectral properties and anisotropy of the transport of charge carriers for a series of heterocirculene structures have been established. A new type of donor-σ-acceptor emitter using a sulfobenzimide moiety as an acceptor unit is demonstrated for the first time, showing thermally activated delayed fluorescence. It was established that the 9-(2,3,5,6-tetrafluoro-4-vinylphenyl)carbazole molecule can be used as a multifunctional structure, in particular, as a fluorescent emitter, a host material for organic light-emitting diodes, and based on quantum dots. Functionalization approaches of a series of perylene derivatives using quantum chemistry methods have been developed in order to improve their transport and optoelectronic properties. The aromaticity nature, electronic, vibrational and NMR spectra of new covalent organic frameworks based on tetraoxa[8]circulene, which were first predicted by us based on quantum chemical modeling in 2014 and synthesized only in 2022, were established. The mechanism of triplet-singlet energy transfer in organic light-emitting diodes based on diphenylamine-carbazole derivatives is proposed. Product Description popup.authors Ivaniuk Khrystyna B. Babiy Alyona V. Heleveria Dmytro M. Karaush-Karmazin Nataliia M. Panchenko Oleksandr O. Chernyuk Maryana V. popup.nrat_date 2024-01-30 Close