8-Quinolinolato lithium (Liq, CAS 25387-93-3) is a light yellow organolithium powder used as an electron injection layer (EIL) material in organic electronic devices, most often OLEDs. Paired with an aluminium electrode, a very thin Liq film of only 1-2 nm is usually enough to inject electrons efficiently from the cathode into the electron transport layer (ETL).
The Liq/Al combination is well established as an effective cathode system for common ETL materials, and ultrathin Liq interlayers have been reported to substantially improve the operational stability of light-emitting diodes. Published device stacks using Liq include white, blue, deep blue, green and greenish-blue OLEDs, among them a green device reaching a maximum EQE of 41.3%.
Ossila supplies Liq in a sublimed grade with >99% purity, purified by sublimation for ultra-pure material, and an unsublimed grade with >98% purity. The compound has a HOMO of 5.58 eV and LUMO of 3.15 eV, a melting point of 366-368 ºC and a decomposition temperature of at least 430 °C (5% weight loss).
- Thin electron injection layer between the ETL and aluminium cathode in OLEDs.
- Liq/Al cathode system for use with general electron transport layer materials.
- Ultrathin interlayers to improve the operational stability of light-emitting diodes.
- Fabrication of white, blue, green and deep blue phosphorescent and fluorescent OLED stacks.
- Electron injection in TADF OLED device research.
| Brand | Ossila |
|---|---|
| CAS number | 25387-93-3 |
| Molecular formula | C9H6LiNO |
| Purity | >99% (sublimed), >98% (unsublimed) |
| Category | — |
| Pack sizes | — |
| Physical form | Light yellow powder |
| Storage | — |
- Product code: M732
- 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
- Melting point: 366-368 ºC (lit.)
- TGA: Td ≥ 430 °C (5%)
- DSC: Tm = 365 °C (+/- 1 °C)
- Synonyms: Liq, Lithium-8-hydroxyquinolinolate, Lithium 8-quinolinolate, 8-Hydroxyquinolinolato lithium
- Classification: Electron transport layer (ETL) materials, Organic Light-Emitting Diodes, Organic electronics, Sublimed materials
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