Order Code: M421
MSDS sheet


(excluding Taxes)


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; Aluminium 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


Sublimed* >99%

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, to mainly filter out trace metals and inorganic impurities. Sublimation happens under certain pressure for chemicals that only go through two physical stages: from a solid state to vapour (gas), and when the vapour condenses to a solid state on a cool surface (referred to as cold finger). The most typical examples of sublimation are iodine and dry ice. For more details about sublimation, please refer to sublimed materials for OLEDs and perovskites and our collection of sublimed materials.


Chemical Structure

 chemical structure of balq
 Chemical Structure of Bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum (BAlq); CAS No. 146162-54-1; Chemical Formula C32H25AlN2O3



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 it is photochemically stable [5].

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   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   white
Max. Luminance  45,000 cd/m2
Max. Current Efficiency 20.8 cd/A
Max. Power Efficiency 15.9 lm W1
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   white
Max. EQE  16.0%
Max. Current Efficiency 45.6 cd/A
Max. Power Efficiency 35.8 lm W1

*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).


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.