Tris-PCz has a tri-carbazole back-boned structure joined at the 3 and 6 positions. The highly-conjugated carbazoles makes Tris-PCz electron-rich, which is widely used as a hole-transport layer material in TADF-OLED devices.
Due to its electron-rich nature, Tris-PCz can form exciplexes with electron-deficient materials (such as B4PyPPM) in highly-efficient OLED devices with TADF characteristics.
Tris-PCz has a high triplet energy (ET = 2.7 eV), so it is also frequently used as an exciton block layer material to effectively prevent the excitons' energy from being transferred (to the donor or acceptor) to achieve high fluorescence quantum efficiency.
Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence, H. Nakanotani1 et al., Sci. Rep., 3, 2127 (2013); DOI: 10.1038/srep02127.
High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence, J. Nishide et al., Appl. Phys. Lett. 104, 233304 (2014); doi: 10.1063/1.4882456.
High-performance red organic light-emitting devices based on an exciplex system with thermally activated delayed fluorescence characteristic, S. Yuan et al., Org. Electronics, 39, 10-15 (2016); doi: 10.1016/j.orgel.2016.09.020.
Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIEy below 0.4, C. Chan et al., Nat. Commun., 9, 5036 (2018); DOI: 10.1038/s41467-018-07482-6.
Exciplex-Based Electroluminescence: Over 21% External Quantum Efficiency and Approaching 100 lm/W Power Efficiency, B. Liang et al., J. Phys. Chem. Lett., 10, 2811−2816 (2019); DOI: 10.1021/acs.jpclett.9b01140.
Balance the Carrier Mobility To Achieve High Performance Exciplex OLED Using a Triazine-Based Acceptor, W. Hung et al., ACS Appl. Mater. Interfaces, 8, 4811−4818 (2016); DOI: 10.1021/acsami.5b11895.
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