8-Quinolinolato lithium (Liq)

CAS Number 25387-93-3

Charge Transport Layer Materials, Electron Injection Layer Materials, Electron Transport Layer Materials, High Purity Sublimed Materials, Materials, OLED Materials, Semiconducting Molecules

MSDS

8-Quinolinolato lithium (Liq) CAS 25387-93-3

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	λ_max 261 nm (in THF)
Fluorescence	λ_em 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	T_d≥ 430 ^oC (5%)
DSC	T_m=365 ^oC (+/- 1^oC)
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

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
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
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
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
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
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
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
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 MSDS sheet

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); doi: 10.1021/cm0010248
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.
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); DOI: 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); DOI: 10.1166/jnn.2008.IC67. .
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.