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Bepp2, blue fluorescence emitter with excellent charge transport ability
ETL and HBL material used in high efficiency OLEDs
Bis[2-(2-hydroxyphenyl)-pyridine] beryllium, known as Bepp2, belonging to the beryllium complex family, is a blue fluorescence emitter with excellent charge transport ability. Due to its high electron mobility and high triplet energy level, Bepp2 has been used as an electron-transporting and hole/exciton-blocking layer material in OLEDs. High-efficiency blue OLEDs by using Bepp2 as the emitting layer material and high efficiency white OLEDs using Bepp2 as host material have been achieved [1-8].
Bepp2 can be also used as host material to fabricate orange, green, red EL devices.
High-performance blue electroluminescent devices based on hydroxyphenyl-pyridine beryllium complex, Y Liu, et al., Appl. Phys. Lett., 78, 2300 (2001); doi: 10.1063/1.1366338.
Hydroxyphenyl-pyridine Beryllium Complex (Bepp2) as a Blue Electroluminescent Material, Y. Li et al., Chem. Mater., 12, 2672–2675 (2000); DOI: 10.1021/cm000237u.
Highly efficient white organic electroluminescence device based on a phosphorescent orange material doped in a blue host emitter, T. Peng et al., J. Mater. Chem., 21, 3551-3553 (2011); DOI: 10.1039/C0JM03645E.
Organic white light electroluminescent devices, S. Liu et al., Thin Solid Films, 363, 294-297 (2000); doi:10.1016/S0040-6090(99)01017-2.
White light emission induced by confinement in organic multiheterostructures, Z. Y. Xie et al., Appl. Phys. Lett., 74, 641 (1999); http://dx.doi.org/10.1063/1.123190.
Low roll-off efficiency green phosphorescent organic light-emitting devices with simple double emissive layer structure, W-S. Jeon et al., Appl. Phys. Lett., 93, 063303 (2008); doi: 10.1063/1.2969040.
Highly efficient bilayer green phosphorescent organic light emitting devices, W-S. Jeon et al., Appl. Phys. Lett., 92, 113311 (2008); http://dx.doi.org/10.1063/1.2898527.
High-efficiency and high-quality white organic light-emitting diode employing fluorescent emitters, Y. Yang et al., Org. Electronics, 12 (1), 29-33 (2011); doi:10.1016/j.orgel.2010.10.006.
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