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Bis-4-(N-carbazolyl)phenyl)phenylphosphine oxide - BCPO - is a bipolar host material containing phenylphosphine oxide as an electron withdrawing moeity and two carbazolyl groups as electron donating moieties. BCPO possesses a high triplet energy (ET ) of 3.01 eV and a high glass transition temperature (Tg) of 137 °C. The phosphine oxide moiety in the middle of the structure can effectively cut off the electron communication between the two N-phenyl carbazole groups, leading to a much higher triplet energy of BCPO than CBP.
Like CBP and mCBP, BCPO can be used as a universal host to blue, green and red fluorescent and phosphorescent devices using simple device architectures.
A Highly Efficient Universal Bipolar Host for Blue, Green, and Red Phosphorescent OLEDs, H. Chou et al., Adv. Mater., 22, 2468–2471 (2010); DOI: 10.1002/adma.201000061.
Isomeric Bright Sky-Blue TADF Emitters Based on Bisacridine Decorated DBNA: Impact of Donor Locations on Luminescent and Electroluminescent Properties, G. Meng et al., Adv. Optical Mater., 7, 1900130 (2019); DOI: 10.1002/adom.201900130.
Triazatruxene: A Rigid Central Donor Unit for a D–A3 Thermally Activated Delayed Fluorescence Material Exhibiting Sub-Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs, P. L. dos Santos et al., Adv. Sci., 5, 1700989 (2018); DOI: 10.1002/advs.201700989.
A high triplet energy, high thermal stability oxadiazole derivative as the electron transporter for highly efficient red, green and blue phosphorescent OLEDs, C-H. Shih et al., J. Mater. Chem. C, 3, 1491-1496 (2015); DOI: 10.1039/C4TC02348J.
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