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Bebq2

Bebq2
Product Code M741
Price $299.00 ex. VAT
$ USD

Bebq2, a blue-fluorescence emitter with excellent charge transport ability

Best for use as an ETL material. Available online for priority dispatch

Bis(10-hydroxybenzo[h]quinolinato)beryllium, known as Bebq2, is the brother of Bepp2 in the Beryllium complex family. It is also a blue-fluorescence emitter with excellent charge transport ability.

When compared with Alq3 as an electron-transport material, Bebq2 was proven to be superior, even though the ionisation potential and optical band gap of Bebq2 (5.5 eV and 2.7 eV respectively) and Alq3 (5.6 eV and 2.8 eV respectively) are almost the same. The best use for Bebq2 is not as an emitting-layer material or a host material (even though it is a widely used host material), but as an electron-transport material [1].

General Information

CAS number 148896-39-3
Chemical formula C26H16BeN2O2
Molecular weight 397.43 g/mol
Absorption* λmax 406 nm
Fluorescence λem 440 nm (DCM)
HOMO/LUMO HOMO = 5.5 eV, LUMO = 2.8 eV
Synonyms
  • Be(bq)2
  • Bepq2
  • Bis(10-hydroxybenzo[h]quinolinato)beryllium
  • Beryllium bisbenzo[h]quinolin-10-olate
Classification / Family Blue emitter, Electron-transport layer materials (ETL), Hole-blocking layer materials (HBL), Organic light-emitting diode (OLED), Organic electronics

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

Product Details

Purity >99% (sublimed) 
Thermogravimetric Analysis (TGA) 434 °C (5% weight loss)
Differential Scanning Calorimetry (DSC) 364.9 °C
Colour Yellow powder/crystals

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

Chemical Structure

Chemical Structure of Bis(10-hydroxybenzo[h]quinolinato)beryllium (Bebq2)
Chemical Structure of Bis(10-hydroxybenzo[h]quinolinato)beryllium (Bebq2)

Device Structure(s)

Device structure ITO/DNTPD (40 nm)/Bebq2:Ir(piq)3 (50 nm, 4 wt%)/LiF (0.5 nm)/Al (100 nm) [2]
Colour Red red light emitting device
Max. Current Efficiency 9.38 cd/A
Max. Power Efficiency 11.72 lm W−1
Device structure ITO/NPB (40 nm)/Bebq2:1 wt% Ir(piq)3 (30 nm)/Bebq2 (20 nm)/LiF (0.5 nm)/Al (100 nm) [3]
Colour Red red light emitting device
Max. Current Efficiency 12.71 cd/A
Max. Power Efficiency 16.02 lm W−1  
Device structure ITO/MeO-TPD: F4-TCNQ (50 nm, 4 wt%)/NPB (20 nm)/MADN:DSAph (25nm, 7 wt%)/Bebq2 (30 nm)/LiF (1 nm)/Al (200 nm) [4]
Colour Blue blue light emitting device
Max. Luminance 70,645 cd/m2
Max. Current Efficiency 12.7 cd/A
Max. Power Efficiency 9.1 lm W−1
Device structure Ag (100 nm)/ITO (10 nm)/DNTPD (30 nm)/NPB (44 nm)/Bebq2:3 wt% Ir(mphmq)2(acac) (20 nm)/Bphen (31 nm)/Bphen: 5 wt% Li (10 nm)/HATCN (7 nm)/NPB (63 nm)/Bebq2: 3 wt% Ir(mphmq)2(acac) (20 nm)/Bphen (40 nm)/Liq (1 nm)/Mg:Ag (10:1; 18 nm)/NPB (60 nm) [5]
Colour Red red light emitting device
Max. EQE 26.5%
Max. Current Efficiency 95.8 cd/A
Device structure ITO/NPB (40 nm))/AND:3 wt% DPAVBi (45 nm)/Bebq2 (15 nm)/LiF (1.2 nm)/Al (100 nm) [6]
Colour Blue blue light emitting device
EQE @ 100 cd/m2 8.32%
Current Efficiency @100 cd/m2 19.2 cd/A 
Device structure ITO/PEDOT:PSS (30 nm)/α-NPD (40 nm)/Bebq2:TLEC-025* (1 wt%, 35 nm)/TPBI (40 nm)/LiF (1 nm)/Al (100 nm) [7]
Colour Red red light emitting device
EQE @ 100 cd/m2 17.1%
Power Efficiency @100 cd/m2 13.6 lm W−1
Device structure ITO/a-NPB:Bebq2:Ir(piq)3 (1 wt.%, 100 nm)/ LiF (0.5 nm)/Al (100 nm) [8]
Colour Red red light emitting device
Max. Current Efficiency 9.44 cd/A
Max. Purrent Efficiency 10.62 lm W−1 

*For chemical structure information please refer to the cited references

Characterisation (TGA and DSC)

TGA, DSC traces of Bebq2
Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) traces of Bis(10-hydroxybenzo[h]quinolinato)beryllium (Bebq2)

MSDS Documentation

Bebq2 MSDSBebq2 MSDS sheet

Literature and Reviews

  1. Influence of the Emission Site on the Running Durability of Organic Electroluminescent Devices, Y. Hamada et al., Jpn. J. Appl. Phys., 34, L824 (1995); http://iopscience.iop.org/1347-4065/34/7A/L824.
  2. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes, B. Diouf et al., Adv. Mater. Sci.&Eng., 2012, 794674 (2012); doi:10.1155/2012/794674.
  3. Highly Efficient Simple-Structure Red Phosphorescent OLEDs with an Extremely Low Doping Technology, W. S. Jeon et al., J. Info. Display, 10 (2), 87-91 (2009).
  4. Comprehensive Study on the Electron Transport Layer in Blue Flourescent Organic Light-Emitting Diodes, B. Liu et al.,ECS J. Solid Stat. Sci.& Tech., 2 (11) R258-R261 (2013).
  5. High efficiency red top-emitting micro-cavity organic light emitting diodes, M. Park et al., 22, (17), Optics Express, 19919 (2014), DOI:10.1364/OE.22.019919.
  6. High-Efficiency Fluorescent Blue Organic Light-Emitting Device with Balanced Carrier Transport,
    J-H. Lee et al., J. Electrochem., Soc., 154, 7, J226-J228 (2007).
  7. Highly Efficient and Stable Red Phosphorescent Organic Light-Emitting Diodes Using Platinum Complexes, H. Fukagawa et al.,  Adv. Mater., 24, 5099–5103 (2012); DOI: 10.1002/adma.201202167.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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