Substituent effect on anthracene-benzophenone triad system: Photophysical properties and application to OLEDs with “hot-exciton” characteristics
- Authors
- Lee, Y.; Hwang, K.M.; Lee, S.; Park, B.B.; Kim, T.; Han, W.-S.
- Issue Date
- 1-May-2023
- Publisher
- Elsevier Ltd
- Citation
- Dyes and Pigments, v.213
- Journal Title
- Dyes and Pigments
- Volume
- 213
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/30966
- DOI
- 10.1016/j.dyepig.2023.111171
- ISSN
- 0143-7208
1873-3743
- Abstract
- ‘‘Hot-exciton’’ materials exhibiting high-lying reverse intersystem crossing (hRISC) are promising candidates for organic light-emitting diode (OLED) materials owing to their improved exciton utilization efficiency and efficiency roll-off. To investigate the excited-state structure–property relationship in anthracene/benzophenone-based materials, we designed and prepared three anthracene-benzophenone derivatives by varying substituents at peripheral benzophenone units, namely, AnBP-F, AnBP-H, and AnBP-OMe. Systematic investigation of the excited-state properties of these compounds and DFT calculations showed that they have hybridized local and charge-transfer (HLCT) characteristics in their emissive transitions. All prepared compounds were adapted in a non-doped OLED device, which exhibited an external quantum efficiency (EQE) of up to 2.88%. To further study the exciton dynamics in the device, magnetoelectroluminescence was measured, which exhibits the combined characteristics of triplet–triplet annihilation (TTA) and HLCT mechanisms. © 2023 Elsevier Ltd
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