Order Code: M731MSDS sheet
|Sublimed (>99% purity)||M731||1 g||£98|
|Unsublimed (>98% purity)||M732||5 g||£111|
|Sublimed (>99% purity)||M731||5 g||£366|
|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 |
|Synonyms||Liq, lithium-8-hydroxyquinolinolate, lithium 8-quinolinolate, 8-Hydroxyquinolinolato lithium|
|Classification / Family||Organic Light-Emitting Diodes, Organic electronics|
Sublimed* >99%Unsublimed >98%
|Melting point||366-368 ºC (lit.)|
|TGA||Td ≥ 430 oC (5%)|
|DSC||Onset: 365 ± 1 oC|
|Colour||Light yellow powder|
*Sublimation is a technique used to obtain ultra pure-grade chemicals mainly to filter out trace metals and inorganic impurities. Sublimation happens under certain pressure for chemicals to only go through two physical stages: from a solid sate to vapour (gas), and when the vapour condensed 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.
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 .
|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) |
|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) |
|Luminance@200 cd/m2||32,570 cd/m2|
|Max. Current Efficiency||43.76 cd/A|
|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) |
|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) |
|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 |
|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) |
|Max. Current Efficiency||30.6 cd/A|
|Max. Power Efficiency||12.2 lm W−1|
ITO/HTL (100 nm)/CBP:9 wt%DACT-II*(40 nm)/BAlq (30 nm)/Liq/Al 
*For chemical structure information, please refer to the cited references.
Characterisation (TGA and DSC)
Literature and Review
- Lithium-Quinolate Complexes as Emitter and Interface Materials in Organic Light-Emitting Diodes, C. Schmitz et al., Chem. Mater., 12, 3012-3019 (2000).
- Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers, DPK. Tsang et al., Sci Rep. 2016; 6: 22463; doi:10.1038/srep22463.
- 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.
- 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.
- 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). http://dx.doi.org/10.1016/j.orgel.2014.07.001.
- 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.
- 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).
- 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.
- Purely organic electroluminescent material realizing 100% conversion from electricity to light,
H. Kaji et al., Nat. Commun., 6:8476 (2015); DOI: 10.1038/ncomms9476.