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3P-T2T, 2,4,6-tris(2-(1H-pyrazol-1-yl)phenyl)-1,3,5-triazine, has a structure with an electron deficient triazine core equipped with phenylpyrazole peripherals. Like PO-T2T and 3N-T2T, 3P-T2T is one of the triazine derivatives and is normally used as an electron transport layer (ETL) in OLED devices. 3P-T2T shows a higher electron transport/injection ability than T2T due to the peripheral three electron-withdrawing pyrazolyl moieties.
As an acceptor, together with TCTA as hole transporting donor, 3P-T2T forms exciplex as a highly efficient yellow delayed fluorescent emitter. The exciplex TCTA:3PT2T has high and balanced hole and electron mobilities and large energy-levels offsets at the TCTA/3P-T2T interface.
3P-T2T can not only accommodate highly efficient blue, but can also act as suitable host for green yellow and red phosphorescent emitters.
Highly efficient red OLEDs using DCJTB as the dopant and delayed fluorescent exciplex as the host, B. Zhao et al., Sci. Report, 5, 10697 (2015); DOI: 10.1038/srep10697.
New exciplex systems composed of triazatruxene donors and N-heteroarene-cored acceptors, Y-C. Hu et al., Mater. Chem. Front., 4, 2029-2039 (2020); DOI: 10.1039/d0qm00188k.
Carbazole/Benzimidazole-Based Bipolar Molecules as the Hosts for Phosphorescent and Thermally Activated Delayed Fluorescence Emitters for Efficient OLEDs, Z-J. Gao et al., ACS Omega, 5, 10553−10561 (2020); 10.1021/acsomega.0c00967.
Peripheral modification of 1,3,5-triazine based electron-transporting host materials for sky blue, green, yellow, red, and white electrophosphorescent devices, J. Mater. Chem., 22, 15620-15627 (2012); DOI: 10.1039/C2JM31904G.
The First Tandem, All-exciplex-based WOLED, W-Y. Hung et al., Sci. Report, 4, 5161 (2014); DOI: 10.1038/srep05161.
Exciplex-Forming Cohost for High Efficiency and High Stability Phosphorescent Organic Light-Emitting Diodes, C-J. Shih et al., ACS Appl Mater Interfaces, 10(2), 2151-2157 (2018); DOI: 10.1021/acsami.7b15034.
High-efficiency organic light-emitting diodes with exciplex hosts, Q. Wang et al., J. Mater. Chem. C, 7, 11329 (2019); DOI: 10.1039/c9tc03092a.
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