Bepp2

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.

General Information

* Measurable with an optical spectrometer, see our spectrometer application notes.

Product Details

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

Chemical Structure

Device Structure(s)

Device structure	ITO/NPB (60 nm)/Bepp2 (50 nm)/LiF (1 nm)/Al (200 nm) [1]
Colour	Blue
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) [2]
Colour	Blue
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 [3]
Colour	White
Max. EQE	27.8%
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 [4]
Colour	White
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) [6]
Colour	Green
Max. EQE	18.6%
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) [7]
Colour	Green
Max. Current Efficiency	38.3 cd/A
Max. Power Efficiency	46.4 lm W−1

MSDS Documentation

Bepp2 MSDS sheet

Literature and Reviews

1. 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.
2. Hydroxyphenyl-pyridine Beryllium Complex (Bepp2) as a Blue Electroluminescent Material, Y. Li et al., Chem. Mater., 12, 2672–2675 (2000); DOI: 10.1021/cm000237u.
3. 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.
4. Organic white light electroluminescent devices, S. Liu et al., Thin Solid Films, 363, 294-297 (2000); doi:10.1016/S0040-6090(99)01017-2. 
5. 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.
6. 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.
7. 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.
8. 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.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.