CAS Number 220694-90-6
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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.
|Molecular weight||349.39 g/mol|
|Absorption||λmax 329 nm, 361 nm (chloroform)|
|Fluorescence||λem 440 nm (chlorofom); 450 nm (film)|
|HOMO/LUMO||HOMO = 5.7 eV, LUMO = 2.6 eV |
|Classification / Family||Blue emitter, Fluorescence host materials, Electron-transport layer (ETL), Hole-blocking layer (HBL), Sublimed materials|
|Purity||Sublimed* > 99%|
TGA 365 °C (5% weight loss)
DSC 314 °C (onset)
|Colour||Light yellow powder/crystals|
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.
|Device structure||ITO/NPB (60 nm)/Bepp2 (50 nm)/LiF (1 nm)/Al (200 nm) |
|Max. Luminance||15, 000 cd/m2|
|Max. Current Efficiency||3.8 cd/A|
|Max. Power Efficiency||3.43 lm W−1|
|Device structure||ITO/Cu-Pc(10 nm)/TPD(50 nm)/Bepp2 (40 nm)/LiF(1.5 nm)/Al(200 nm) |
|Max. Luminance||4,000 cd/m2|
|Max. Power Efficiency||0.55 lm W−1|
|Device structure||ITO/NPB (30 nm)/(bzq)2Ir(dipba):Bepp2 (20 nm)/Bepp2 (35 nm)/LiF (0.5 nm)/Al |
|Max. Current Efficiency||60.8 cd/A|
|Max. Power Efficiency||48.8 lm W−1|
|Device structure||ITO/TPD (50 nm)/BePP2 (5 nm)/TPD (4 nm)/BePP2:rubrene (5 nm)/TPD (4 nm)/Alq (10 nm)/Al |
|Max. Luminance||20,000 cd/m2|
|Max. Power Efficiency||1.11 lm W−1|
|Device structure||ITO/NPB (40 nm)/TCTA:Ir(ppy)3 (15 nm), 12 wt%/Bepp2:Ir(ppy)3 (15 nm), 12 wt%/LiF (1 nm)/Al (100 nm) |
|Max. Current Efficiency||58.7 cd/A|
|Max. Power Efficiency||65.1 lm W−1|
|Device structure||ITO/DNTPD (40 nm)/Bepp2:Ir(ppy)3 (50 nm), 15 wt%/LiF (0.5 nm)/Al (100 nm) |
|Max. Current Efficiency||38.3 cd/A|
|Max. Power Efficiency||46.4 lm W−1|
Literature and Reviews
- 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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