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Product Code M731-1g
Price $200 ex. VAT

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Liq, for efficient electron injection in organic electronic devices

To enhance the operational stability of LEDs


8-Hydroxyquinolinolato-lithium (Liq), coupled with aluminum (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 T=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.

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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
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 £160
Unsublimed (>98% purity) M732 5 g £150
Sublimed (>99% purity) M731 5 g £520

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. 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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