2-TNATA, or 4,4',4''-Tris[2-naphthyl(phenyl)amino]triphenylamine (CAS 185690-41-9), is a starburst-type triphenylamine derivative used as a hole-injection and hole-transport material in organic light-emitting diodes (OLEDs). It is supplied as a pale yellow to yellow powder or crystals in two grades: sublimed with >99.0% purity and unsublimed with >98.0% purity.
The molecule forms highly uniform thin films, and its low ionization potential of around 5.1 eV (HOMO 5.1 eV, LUMO 2.2 eV) makes it well suited to hole-injection layers. When combined with tungsten oxide (WO3) as a p-doped transport layer in Alq3-based p-i-n OLEDs, it has been reported to improve hole injection and conductivity, giving long device lifetime, a low driving voltage of 3.1 V and a power efficiency of 3.5 lm/W at 100 cd/m2.
Published device structures using 2-TNATA cover green, deep blue, red and white OLEDs, including a green phosphorescent device reaching 62.6 cd/A current efficiency at 20 mA/cm2.
- Hole-injection layers in vacuum-deposited OLED device stacks.
- Hole-transporting layers in organic light-emitting diodes.
- p-doped transport layers when co-deposited with tungsten oxide (WO3) in p-i-n OLEDs.
- Research on green, deep blue, red and white OLED devices.
| Brand | Ossila |
|---|---|
| CAS number | 185690-41-9 |
| Molecular formula | C66H48N4 |
| Purity | >99.0% (sublimed), >98.0% (unsublimed) |
| Category | — |
| Pack sizes | — |
| Physical form | Pale yellow to yellow powder/crystals |
| Storage | — |
- Product code: M611
- Molecular weight: 897.11 g/mol
- Melting point: 246-248 °C (lit.)
- Absorption: λ max 326 nm (THF)
- Fluorescence: λ em 490 nm (THF)
- HOMO/LUMO: HOMO = 5.1 eV, LUMO = 2.2 eV
- Synonyms: 2-TNATA, 2TNATA, 2T-NATA
- Classification: Triphenylamine derivatives, Hole-injection materials, Hole-transporting materials, Light-emitting diodes
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