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Product Code M381-5g
Price $263 ex. VAT

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Alq3, effective electron-transport material for OLEDs

High thermal stability and quantum yield of fluorescence


Tris(8-hydroxyquinoline)aluminum(III), commonly known as Alq3, is widely used in organic light-emitting diodes (OLEDs) as an electron-transport material (ETM) and emitting layer material (ELM) due to its high thermal stability, high quantum yield of fluorescence and high electron-transport ability.

Ossila's Alq3 was used in the high-impact paper (IF 30.85)

Alq3 from Ossila was used in the high-impact paper (IF 30.85), Engineering Band-Type Alignment in CsPbBr3 Perovskite-Based Artificial Multiple Quantum Wells, K. Lee et al., Adv. Mater., 33 (17), 2005166 (2021); DOI: 10.1002/adma.202005166.

Alq3 as the electron-transport and emitting layer material was the first efficient low molecular weight OLED reported by Tang in 1987 [1]. Since then, metaloquinolates have become the focus of new electroluminescent materials research, with Alq3 being the most studied.

General Information

Full name Tris(8-hydroxyquinoline)aluminum
Synonyms
  • Alq3 
  • 8-Hydroxyquinoline aluminum salt
  • Aluminum 8-hydroxyquinolinate
  • Aluminum oxinate
  • Tris(8-hydroxyquinolinato)aluminum
CAS number 2085-33-8 
Molecular formula C27H18AlN3O3
Molecular weight 459.43 g/mol
Absorption λmax 259 nm (in THF)
Fluorescence λmax 512 nm (in THF)
HOMO / LUMO HOMO 5.62 eV      LUMO 2.85 eV
Classification / Family Organometallic, Electron transport layer (ETL), Electron injection layer (EIL), OLED emitting layer (ELM)

Product Details

Purity >99% (sublimed)
Melting point 415.4 °C (DSC onset)
Appearance Yellow-greenish powder

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials page.

Chemical Structure

Chemical structure of Alq3
Chemical structure of tris-(8-hydroxyquinoline)aluminum (Alq3)

Device Structure(s)

Device structure ITO/ NPB(60 nm)/Alq3:DCM(7nm)/BCP(12 nm)/ Alq3(36nm)/ MgAg(200 nm) [2]
Colour Red red light emitting device
Max. Luminance 1, 000 cd/m2
Max. Current Efficiency 5.66 cd/A 
Device structure  ITO/m-MTDATA:MoOx (3:1, 15 nm)/m-MTDATA (30 nm)/NPB (5 nm)/Alq3 (50 nm)/BPhen (10 nm)/LiF (1 nm)/Al (100 nm) [3]
Colour Green green light emitting device
Max. Luminance 42,090 cd/m2 
Max. Current Efficiency 4.77 cd/A
Max. Power Efficiency 3.5 lm W1
Device structure  ITO/α-NPD* (50 nm)/7%-Ir(ppy)3:CBP (20 nm)/BCP (10 nm)/Alq3 (40 nm)/Mg–Ag (100 nm)/Ag (20 nm) [4]
Colour Green green light emitting device
Max EQE (12.0±0.6)%
Max. Powder Efficiency (45±2) lm W1
Device structure ITO/NPB (30 nm)/NPB: DCJTB: C545T* (10 nm)/NPB (4 nm)/DNA (8 nm)/(BCP) (9 nm)/Alq3 (30 nm)/LiF (1 nm)/Al (100 nm) [5]
Colour White white light emitting device
Max. Luminance  13,600 cd/m2
Max. Current Efficiency 12.3 cd/A
Max. Power Efficiency 4.4 lm W1
Device structure ITO/2-TNATA:33% WO3 (100 nm)/NPB (10 nm)/Alq3 (30 nm)/Bphen (20 nm)/BPhen: 2% Cs (10 nm)/Al (150 nm) [6]
Colour Green green light emitting device
Operating Voltage for 100 cd/m2 3.1 V
Current Efficiency for 20 mA/cm2 4.4 cd/A
Power Efficiency for 20 mA/cm2 3.3 lm W1
Device structure ITO/CuPc(6.0 nm)/[NPB*(3.8 nm)/CuPc (1.5 nm)]4/NPB (15.0 nm)/Alq3 (60.0 nm)/Mg:Ag/Ag [7]
Colour Green green light emitting device
Max. Luminance 15,000 cd/m2
Max. Current Efficiency 10.8 cd/A

*For chemical structure information please refer to the cited references.

Characterisation

dsc-alq3

DSC trace of Tris-(8-hydroxyquinoline)aluminum (Alq3)

Pricing

Grade Order Code Quantity Price
Sublimed (>99% purity) M381 5 g £210
Sublimed (>99% purity) M381 10 g £340

MSDS Documentation

Alq3 MSDSAlq3 MSDS sheet

Literature and Reviews

  1. Organic electroluminescent diodes, C. Tang et al., Appl. Phys. Lett. 51, 913 (1987)
  2. High-efficiency red electroluminescence from a narrow recombination zone confinedby an organic double heterostructure, Z. Xie et al., Appl. Phys. Lett., 79, 1048 (2001); doi: 10.1063/1.1390479 .
  3. Very low turn-on voltage and high brightness tris-(8-hydroxyquinoline) aluminumbasedorganic light-emitting diodes with a MoOx p-doping layer, G. Xie et al., Appl. Phys. Lett., 92, 093305 (2008); doi: 10.1063/1.2890490.
  4. Efficient electrophosphorescence using a doped ambipolar conductive molecular organic thin film, C. Adachi et aL., Org. Electronics, 2(1), 37-43 (2001), doi:10.1016/S1566-1199(01)00010-6.
  5. High efficiency white organic light-emitting devices by effectively controlling exciton recombination region, F. Guo et al., Semicond. Sci. Technol. 20, 310–313 (2005).
  6. Highly Power Efficient Organic Light-Emitting Diodes with a p-Doping Layer, C-C. Chang et al., Appl. Phys. Lett., 89, 253504 (2006); doi: 10.1063/1.2405856.
  7. Organic light-emitting diodes with improved hole-electron balance by using copper phthalocyanine/aromatic diamine multiple quantum wells, Y. Qiu et al., Phys. Lett., 80, 2628 (2002); Appl. doi: 10.1063/1.1468894.
  8. Molecular Orbital Study of the First Excited State of the OLED Material Tris(8-hydroxyquinoline)aluminum(III), M. D. Halls et al., Chem. Mater., 13 (8), 2632–2640 (2001), DOI: 10.1021/cm010121d.
  9. Organic electroluminescent devices with improved stability, S. A. Van Slyke et al., Appl. Phys. Lett. 69, 2160 (1996); http://dx.doi.org/10.1063/1.117151
  10. Metal−Alq3 Complexes:  The Nature of the Chemical Bonding, A. Curioni et al., J. Am. Chem. Soc., 121 (36), pp 8216–8220 (1999).
  11. Enhancement of power conversion efficiency of P3HT:PCBM solar cell using solution processed Alq3 film as electron transport layer, B. Y. Kadem et al., J Mater Sci: Mater Electron 26:3976–3983 (2015), DOI 10.1007/s10854-015-2933-3.
  12. The impurity effects on OLEDs via transient electroluminescence analysis, C.-F. Lin et al., IEEE 17-20 (2015), 10.1109/AM-FPD.2015.7173184.

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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