Ultrahighly-efficient and pure deep-blue thermally activated delayed fluorescence organic light-emitting devices based on dimethylacridine/thioxanthene-S,S-dioxide
- Authors
- Jeon, Young Pyo; Kong, Byung Ki; Lee, Eun Jung; Yoo, Keon-Ho; KIM, TAE WHAN
- Issue Date
- May-2019
- Publisher
- ELSEVIER
- Keywords
- Thermally activated delayed fluorescence; Organic light-emitting devices; Deep-blue emission; Ultrahigh-efficiency; Thioxanthene-S,S-dioxide; Biphenyl
- Citation
- NANO ENERGY, v.59, pp.560 - 568
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 59
- Start Page
- 560
- End Page
- 568
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14146
- DOI
- 10.1016/j.nanoen.2019.02.067
- ISSN
- 2211-2855
- Abstract
- A novel deep-blue emissive dopant material, 2,7-bis(9,9-dimethylacridine-10(9H)-yl)-9,9-diphenyl-9H-thioxanthene 10-,10-dioxide (DMA-ThX), is synthesized for use in highly-efficient thermally activated delayed fluorescence organic light-emitting devices (TADF OLEDs). The molecular design of DMA-ThX retains the overlap between the lowest singlet excited state (S-1) and the lowest triplet excited state (T-1) because of its twisted molecular structure. From photoluminescence emission measurements at low temperature, the difference between the S-1 and the T-1 energy levels of DMA-ThX is found to be 0.07 eV. Furthermore, the external quantum efficiency of the deep-blue-emitting TADF OLEDs with DMA-ThX-doped bis[2-(diphenylphosphino) phenyl] ether oxide is 18.4%, which is significant, and the Commission Internationale de l'Eclairage coordinates are (0.14, 0.14), indicative of very pure deep-blue emission.
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