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8-Quinolinolato lithium (Liq)


Product Code M731
Price £119.00 ex. VAT

8-Hydroxyquinolinolato-lithium (Liq), coupled with aluminium (Al), is commonly used as an electron injection layer (EIL) material in organic electronic devices, particularly OLEDs. Normally, only a very thin layer (1-2 nm) Liq is needed for efficient electron injection from the electrode to the electron transport layer (ETL).

Liq/Al has also been widely known to be an effective cathode system towards general electron transport layer materials. It has also been reported that ultrathin Liq interlayers can greatly enhance the operational stability of light-emitting diodes [2].

General Information

CAS number 25387-93-3
Chemical formula C9H6LiNO

Molecular weight

151.09 g/mol
Absorption λmax  261 nm (in THF)
Fluorescence λem 331 nm (in THF)
HOMO/LUMO HOMO = 5.58 eV, LUMO = 3.15 eV [1]
Synonyms Liq, Lithium-8-hydroxyquinolinolate, Lithium 8-quinolinolate, 8-Hydroxyquinolinolato lithium
Classification / Family Electron transport layer (ETL) materials, Organic Light-Emitting Diodes, Organic electronics, Sublimed materials

Product Details

Purity >99% (sublimed), >98% (unsublimed)
Melting point 366-368 ºC (lit.)
TGA Td ≥ 430 oC (5%)
DSC Tm = 365 oC (+/- 1oC)
Colour Light yellow powder

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

Chemical Structure

chemical structure of 8-Hydroxyquinolinolato-lithium (liq)
Chemical Structure of 8-Hydroxyquinolinolato-lithium (Liq)

Device Structure(s)

Device structure ITO (150 nm)/NPB (70 nm)/mCP:Firpic-8.0%:Ir(ppy)3-0.5%:Ir(piq)3-0.5% (30 nm)/TPBi (30 nm)/Liq (2 nm)/Al (120 nm) [3]
Colour White  white
Max. Luminance 37,810 cd/m2 
Max. Current Efficiency 48.1 cd/A
Device structure ITO (180 nm)/TAPC (60 nm)/mCP:Firpic–8 wt% (10 nm)/Ir(ppz)3 (1.5 nm)/mCP:Firpic–8 wt% (10 nm)/Ir(ppz)3 (1.5 nm)/mCP:Firpic–8 wt% (10 nm)/TPBi (30 nm)/Liq (2 nm)/Al (120 nm) [4]
Colour Blue  blue
Luminance@200 cd/m2 32,570 cd/m2
Max. Current Efficiency 43.76 cd/A
Max. EQE 23.4%
Max. Power Efficiency 21.4 lm W−1 
Device structure     Al/MoO3 (3 nm)/mCP (50 nm)/Ir(tfmppy)2(tpip)* (0.5 nm)/TPBi (2.5 nm)/mCP (2.5 nm)/Ir(tfmppy)2(tpip) (0.5 nm)/TPBi (10 nm)/Bphen (45 nm)/Liq (1 nm)/Al (1 nm)/Ag (22 nm)/mCP (80 nm) [5]
Colour Green  green
Max. Current Efficiency 126.3 cd/A
Device structure  ITO/ NPB (70 nm)/DPVBi:BCzVBi (15 wt%, 15 nm)/ADN:BCzVBi (15% wt%, 15 nm)/BPhen (30 nm)/ Liq (2 nm)/Al (100 nm) [6]
Colour Deep Blue deep blue
Max. Luminance       8,668 cd/m2
Max. Current Efficiency  5.16 cd/A
Device structure ITO/NPB/DPVBi:BCzVBi-6%/MADN:DCM2-0.5%/Bphen/Liq/Al [7]
Colour White white
Max. Luminance  15,400 cd/m2
Max. Current Efficiency 6.19 cd/A
Device structure  ITO/PEDOT:PSS (40 nm)/ CzDMAC-DPS* (40 nm)/TPBI (40 nm)/Liq (1.6 nm)/Al (100 nm) [8]
Colour Greenish-blue greenish-blue
Max. Current Efficiency       30.6 cd/A
Max. Power Efficiency 12.2 lm W−1
Device structure    

ITO/HTL (100 nm)/CBP:9 wt%DACT-II*(40 nm)/BAlq (30 nm)/Liq/Al [9]

Colour Green  green
Max. EQE 41.3%

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

Characterisation

DSC/TGA of liq
TGA and DSC trace of 8-Hydroxyquinolinolato-lithium (Liq).

Pricing

Grade Order Code Quantity Price
Sublimed (>99% purity) M731 1 g £98.00
Unsublimed (>98% purity) M732 5 g £111.00
Sublimed (>99% purity) M731 5 g £366.00

MSDS Documentation

8-Quinolinolato lithium MSDS8-Quinolinolato lithium MSDS sheet

Literature and Review

  1. Lithium-Quinolate Complexes as Emitter and Interface Materials in Organic Light-Emitting Diodes,  C. Schmitz et al., Chem. Mater., 12, 3012-3019 (2000); doi: 10.1021/cm0010248
  2. Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers, DPK. Tsang et al., Sci Rep., 6: 22463 (2016); doi:10.1038/srep22463.
  3. Study of Sequential Dexter Energy Transfer in High Efficient Phosphorescent White Organic Light-Emitting Diodes with Single Emissive Layer, J-K. Kim et al., Sci. Reports, 4, 7009 (2014); DOI: 10.1038/srep07009.
  4. Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers, J-S. Kang et al., Optical Materials 47, 78–82 (2015); doi:10.1016/j.optmat.2015.07.003.
  5. High efficiency green phosphorescent top-emitting organic light-emitting diode with ultrathin non-doped emissive layer, X. Shi et al., Org. Electronics, 15, 2408–2413 (2014); DOI: 10.1016/j.orgel.2014.07.001.
  6. Highly efficient blue organic light-emitting diodes using dual emissive layers with host-dopant system, B. Lee et al., J. Photon. Energy. 3(1), 033598 (2013), doi: 10.1117/1.JPE.3.033598.
  7. High efficient white organic light-emitting diodes using BCzVBi as blue fluorescent dopant, Y. Kim et al., J Nanosci. Nanotechnol., 8(9), 4579-83 (2008); DOI: 10.1166/jnn.2008.IC67. .
  8. Multi-carbazole encapsulation as a simple strategy for the construction of solution-processed, non-doped thermally activated delayed fluorescence emitters, J. Luo et al., J. Mater. Chem. C, 2016, DOI: 10.1039/C6TC00418K.
  9. Purely organic electroluminescent material realizing 100% conversion from electricity to light, H. Kaji et al., Nat. Commun., 6:8476 (2015); DOI: 10.1038/ncomms9476.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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