FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.

Product Code M741-1g
Price £310 ex. VAT

Due to shipping restrictions this product is not available in all destinations.

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
  • 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.

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);
  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).
Return to the top