Bepp2

Order Code: M691
MSDS sheet

Price

(excluding Taxes)

£181.30


General Information

CAS number 220694-90-6
Chemical formula C22H16BeN2O2
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 [1]
Synonyms

Be(pp)2
Beryllium bis[2-(2-pyridinyl)phenolate]
Bis[2-(2-hydroxyphenyl)pyridinato]beryllium
Bis[2-(2-hydroxyphenyl)-pyridine]beryllium
Bis[2-(2-pyridinyl)phenolato]beryllium(II)

Classification / Family Blue emitter, Fluorescence host materials, Electron-transport layer materials, Hole-blocking layer materials, Sublimed materials

 

Product Details

Purity Sublimed* > 99%

Melting point

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. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.

 

Chemical Structure

chemical structure of Bis[2-(2-hydroxyphenyl)pyridinato]beryllium, bepp2
Chemical structure of Bis[2-(2-hydroxyphenyl)pyridinato]beryllium (Bepp2); CAS No. 220694-90-6; Chemical formula C22H16BeN2O2.

 

Applications

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 used as host material to fabricate orange, green, red EL devices too.

 

Device structure                      ITO/NPB (60 nm)/Bepp2 (50 nm)/LiF (1 nm)/Al (200 nm) [1]
Colour Blue   blue
Max. Luminance 15, 000 cd/m2
Max. Current Efficiency                  3.8 cd/A
Max. Power Efficiency 3.43 lm W1
Device structure                      ITO/Cu-Pc(10 nm)/TPD(50 nm)/Bepp2 (40 nm)/LiF(1.5 nm)/Al(200 nm) [2]
Colour Blue   blue
Max. Luminance 4,000 cd/m2
Max. Power Efficiency 0.55 lm W1
Device structure ITO/NPB (30 nm)/(bzq)2Ir(dipba):Bepp2 (20 nm)/Bepp2 (35 nm)/LiF (0.5 nm)/Al [3]                      
Colour White   white
Max. EQE 27.8%
Max. Current Efficiency 60.8 cd/A
Max. Power Efficiency 48.8 lm W1
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    white
Max. Luminance 20,000 cd/m2
Max. Power Efficiency 1.11 lm W1
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  green
Max. EQE 18.6%
Max. Current Efficiency 58.7 cd/A
Max. Power Efficiency 65.1 lm W1
Device structure

ITO/DNTPD (40 nm)/Bepp2:Ir(ppy)3 (50 nm), 15 wt%/LiF (0.5 nm)/Al (100 nm) [7]

Colour Green  green
Max. Current Efficiency 38.3 cd/A
Max. Power Efficiency 46.4 lm W1
Device structure ITO/NPB (400 nm)/Bepp2:DCM (0.2 wt.%, 3 nm)/ Bepp2:DCM (0.5 wt.%, 42 nm)/LiF (1 nm)/Al [8]
Colour White   white
EQE@100 cd/m2 9.7-13.1%
Current Efficiency@100 cd/m2 23.8-32.2 cd/A
Power Efficiency@100 cd/m2 13.9-18.9 lm W1

 

Characterisations (DSC and TGA)

TGA-DSC trace of Bepp2, Bis[2-(2-hydroxyphenyl)-pyridine]beryllium
DSC-TGA traces of Bepp2.

 

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.