Highly Charge Transport Thermally Activated Delayed Fluorescence Host Materials Based on Benzimidazole-Acridine Derivatives.

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ID: 101669
2020
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Abstract
We designed novel thermally activated delayed fluorescence (TADF) host molecules for blue electrophosphorescence by combining the electron acceptor benzimidazole (BI) unit and the electron donor acridine derivatives into a single molecular unit based on density functional theory (DFT). We obtained the energies of the first singlet () and the first triplet () excited states of the TADF materials by performing DFT and time-dependent DFT (TD-DFT) calculations to the ground state using dependence on charge transfer amounts for the optimal Hartree-Fock percentage in the exchange-correlation of TD-DFT. Using DFT and TD-DFT calculations, the large separation between the HOMO and LUMO caused a small difference in energy (Ī”) between the S and T states. The host molecules retained high triplet energy and showed great potential for use in blue phosphorescent organic light-emitting diodes. The results showed that these molecules are promising TADF host materials because they have a low barrier to hole and electron injection, balanced charge transport for both holes and electrons, and a small Ī”.
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Authors Lee, Ja Min;Lee, Sae Won;Kim, Young Sik;
Journal Journal of nanoscience and nanotechnology
Year 2020
DOI 10.1166/jnn.2020.17821
URL
Keywords
validation molecular dynamics protein carbonylation geometry optimization amber force field parameterization gaff quantum-mechanics

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