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DTAF, or 9,9-di[4-(di-p-tolyl)aminophenyl]fluorine, has a fluorine centred structure with two N,N-bis(p-tolyl))benzenamine attached to the fluorine. DTAF is electron rich, so is normally used as a hole transporting layer or electron blocking layer (with a LUMO of 1.84 eV) in OLED devices.
DTAF can also form exciplexes with other electron deficient materials, such as PO-T2T, generating yellow exciplex emission. Parallel all exciplex based white-light OLED (WOLED) blend layers of mCP/PO-T2T and DTAF/PO-T2T demonstrates excellent maximum current and powder efficiencies of 27.7 cd/A and 15.8 ml/W respectively with CIE(0.29, 0.35) and CRI 70.6 .
The First Tandem, All-exciplex-based WOLED, W. Huang et al., Sci. Report, 4, 5161 (2014); DOI: 10.1038/srep05161.
A carbazole–phenylbenzimidazole hybrid bipolar universal host for high efficiency RGB and white PhOLEDs with high chromatic stability, W. Hung et al., J. Mater. Chem., 21, 19249 (2011); DOI: 10.1039/c1jm14029a.
A new benzimidazole/carbazole hybrid bipolar material for highly efficient deep-blue electrofluorescence, yellow–green electrophosphorescence, and two-color-based white OLEDs, W. Hung et al., J. Mater. Chem., 20, 10113–10119 (2010); DOI: 10.1039/c0jm02143a.
Exciplex: An Intermolecular Charge-Transfer Approach for TADF, M. Sarma et al., ACS Appl. Mater. Interfaces, 10 (23), 19279–19304 (2018); DOI: 10.1021/acsami.7b18318..
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