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 in the Beryllium complex family. It is also a blue-fluorescence emitter with excellent charge transport ability.

When compared with 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*	λ_max 406 nm
Fluorescence	λ_em440 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 , see our .

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 .

Chemical Structure

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
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
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
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
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
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
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
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)

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

MSDS Documentation

Literature and Reviews

Influence of the Emission Site on the Running Durability of Organic Electroluminescent Devices, Y. Hamada et al., Jpn. J. Appl. Phys., 34, L824 (1995);
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.
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).

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).
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.
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).
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.