Abstract
Carbazole dendrimers are promising materials for realizing highly efficient solution-processed organic light-emitting diodes (OLEDs). Merging carbazole dendrimers with a light-metal complex enables the development of solution-processable materials with excellent optical properties. In this work, highly luminescent Al complexes with carbazole-based dendritic ligands were developed. Metal complexation enhances photoluminescence quantum yields (PLQYs) and thermally activated delayed fluorescence (TADF) properties compared with the corresponding dendritic ligands. Consequently, the Al complex containing symmetric dendritic ligands exhibited a high PLQY of 70% with a delayed fluorescence lifetime of 16 μs in the doped film. Solution-processed OLEDs using these Al complexes as emitters exhibited excellent performance with an external electroluminescence quantum efficiency of 10.6% at a luminance of 100 cd m-2. These results present a strategy to improve the TADF properties and contribute to expanding the chemical space of the TADF materials.
Original language | English |
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Pages (from-to) | 1393-1402 |
Number of pages | 10 |
Journal | ACS Applied Optical Materials |
Volume | 2 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 26 2024 |
All Science Journal Classification (ASJC) codes
- Spectroscopy
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics