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Thermally Activated Delayed Fluorescence Host for High Performance Organic Light Emitting Diodes
Rajkamal Anand,김헌 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We investigate the dissociation mechanism of the C–N bond in the tris(4-carbazoyl-9-ylphenyl)amine (TCTA) which is a blended Thermally Activated Delayed Fluorescence host material in organic light-emitting diodes (OLEDs). The C–N bond dissociation energies, calculated at the density functional theory level, are found to depend strongly on the charge states of the parental molecules. In particular, the anionic C–N bond dissociations resulting low dissociation energies. These low values are attributed to the large electron affinity, a feature that importantly can be modulated via substitution. The implications of this result must be considered when designing blue OLED hosts since these materials must combine chemical stability and high triplet energy.