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Product Code M421-1g
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BAlq, photochemically stable blue-emitting layer material in OLEDs

Used to improve the efficiency and lifetime of PHOLEDs


Bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum, known as BAlq or BAlq3, is widely used as blue-emitting layer materials in organic light-emitting diodes. It is also used as hole-blocking layer or as a “barrier-softening” interfacial layer in between the electron transporting and emissive layers [1, 2, 3, 4]. 

BAlq is also applied as the host material and electron-transport type hole-blocking layer in red PHOLEDs, and to improve the efficiency and lifetime of PHOLEDs. As a hole-blocking material, it is known to allow for high lifetimes, up to 160,000 hours at a luminance level of 100 cd/m[3].

BAlq has a glass transition temperature of 99 °C and is photochemically stable [5].

General Information

CAS number 146162-54-1
Chemical formula C32H25AlN2O3
Molecular weight 512.53 g/mol
Absorption λmax 259 nm (in THF)
Fluorescence λem 334,477 nm (in THF)
HOMO/LUMO HOMO = 5.9 eV, LUMO = 2.9 eV
Synonyms
  • BAlq3
  • Bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum
  • Aluminum 4-biphenylolate 2-methyl-8-quinolinolate
Classification / Family

Electron transporting materials, Hole blocking materials, Light emitter layer materials, Phosphorescent host materials, Organic light-emitting diodes, Organic electronics, Sublimed materials

Product Details

Purity >99% (sublimed)
Melting point Melting point/range: 207 - 214 °C (lit.)
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.

Chemical Structure

Chemical structure of BAlq
Chemical Structure of Bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum (BAlq)

Device Structure(s)

Device structure ITO (110 nm)/NPB(80 nm)/BtpIr*-doped BAlq (47.5 nm)/Alq3(30 nm)/Li2O(0.5nm)/Al(100nm) [5]
Colour red light emitting device Red
Max. EQE 8.6%
Max. Luminance 179 cd/m2
Device structure ITO/CuPc (15 nm)/NPB (80 nm)/NPB: 0.5 wt% DCJTB (20 nm) /Alq3:0.5 wt% C545T (3 nm)/MADN:0.8 wt% DSA-ph*(40 nm)/BAlq3 (10 nm)/LiF/Al [6]
Colour white light emitting device White
Max. Luminance  45,000 cd/m2
Max. Current Efficiency 20.8 cd/A
Max. Power Efficiency 15.9 lm W−1
Device structure ITO/MoOx (5 nm)/NPB (40 nm)/4% Y-Pt*:TCTA (20 nm)/8% FIrpic:mCP(10 nm)/8% FIrpic:UGH2 (10 nm)/BAlq (40 nm)/LiF (0.5 nm)/Al (100 nm) [7]
Colour white light emitting device White
Max. EQE  16.0%
Max. Current Efficiency 45.6 cd/A
Max. Power Efficiency 35.8 lm W−1

*For chemical structure informations please refer to the cited references

Characterisation (TGA and DSC)

dsc/tga balq
TGA and DSC trace of Bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum (BAlq).

MSDS Documentation

BAlq MSDSBAlq MSDS sheet

Literature and Reviews

  1. Electroluminescent properties of organic light-emitting diodes using BAlq and Alq3 co-evaporation layer, Y. Iwama et al., Thin Solid Films 499, 364-368 (2006).
  2. Electroluminescent mechanism of organic light-emitting diodes with blue-emitting Alq, T. Itoh et al., Colloids and Surfaces A: Physicochem. Eng. Aspects 284–285, 594–598 (2006).
  3. A host material containing tetraphenylsilane for phosphorescent OLEDs with high efficiency and operational stability, J-W. Kang et al., Org. Electronic, 9, 452–460 (2008).
  4. Electron transport in the organic small-molecule material BAlq — the role of correlated disorder and traps, S.L.M. van Mensfoort et al., Org. Electronic, 11, 1408–1413 (2010).
  5. Distinguished Paper: Red-Phosphorescent OLEDs Employing Bis(8-Quinolinolato)-Phenolato-Aluminum(III) Complexes as Emission-Layer Hosts, T. Tsuji et al., SID Symposium Digest of Technical Papers, 35 (1), 900-903 (2012).
  6. High efficiency fluorescent white organic light-emitting diodes with red, green and blue separately monochromatic emission layers, Z. Zhang et al., Org. Electronics, 10, 491-495 (2009); doi:10.1016/j.orgel.2009.02.006.
  7. High Efficiency White Organic Light-Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host, S-L. Lai et al., Adv. Funct. Mater., 23, 5168–5176 (2013); DOI: 10.1002/adfm.201300281.

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.

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