Publications by authors named "Paulius Imbrasas"
Article Synopsis
- Researchers discovered a straightforward method to modify the optical and structural features of hydrogen-bonded organic frameworks (HOFs) based on porphyrins by incorporating transition metal ions into their structure.
- The study focused on GTUB-5, specifically its variations with different metals (Cu, Ni, Pd, Zn), which showed changes in band gaps (1.37 to 1.62 eV) and photoluminescence lifetimes (2.3 to 83 ns) due to metal-induced structural alterations.
- These findings suggest that embedding metals can enhance the performance of HOFs for applications in optoelectronics and capturing small molecules by optimizing their properties.
A comprehensive study of the optical properties of CsPbBr perovskite multiple quantum wells (MQW) with organic barrier layers is presented. Quantum confinement is observed by a blue-shift in absorption and emission spectra with decreasing well width and agrees well with simulations of the confinement energies. A large increase of emission intensity with thinner layers is observed, with a photoluminescence quantum yield up to 32 times higher than that of bulk layers.
View Article and Find Full Text PDFMaterials exhibiting thermally activated delayed fluorescence (TADF) have been extensively explored in the last decade. These emitters have great potential of being used in organic light-emitting diodes because they allow for high quantum efficiencies by utilizing triplet states via reverse intersystem crossing. In small molecules, this is done by spatially separating the highest occupied molecular orbital from the lowest unoccupied molecular orbital, forming an intramolecular charge-transfer (iCT) state and leading to a small energy difference between lowest excited singlet and triplet states (Δ).
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