TSBF, or 2,7-Bis(9,9-spirobifluoren-2-yl)-9,9-spirobifluorene (CAS 518997-91-6), is a sublimed organic semiconductor with purity above 99%, supplied as a white to off-white powder or crystals. Its structure links three spirobifluorene units through the 2,7-positions, and it is mainly used as a fluorescent host in OLED devices.
The spirobifluorene family is valued for high glass transition temperatures (T g = 231 °C) together with good thermal and colour stability, which is why related compounds such as Spiro-OMeTAD are widely used in OLED work. The bulky, sterically hindered shape of TSBF suits it to host duties in emissive layers.
Layers doped with TSBF show a low amplified spontaneous emission (ASE) threshold and reduced electroluminescence efficiency roll-off, making the material a candidate for electrically pumped organic semiconductor laser diodes. It absorbs at 350 nm and fluoresces at 415 nm in THF, with HOMO = 6.1 eV and LUMO = 3.0 eV. Sublimation is used to reach ultra-pure grade material.
- Fluorescent host material in the emissive layer of OLED devices.
- Blue emitter research in organic light-emitting devices.
- Studies towards electrically pumped organic semiconductor laser diodes.
- Electron transport layer (ETL) and OFET materials research.
| Brand | Ossila |
|---|---|
| CAS number | 518997-91-6 |
| Molecular formula | C75H44 |
| Purity | >99% (sublimed) |
| Category | — |
| Pack sizes | 500 mg, 1 g |
| Physical form | White to off-white powder/crystals |
| Storage | — |
- Product code: M2213A1
- Molecular weight: 945.15 g/mol
- Full name: 2,7-Bis(9,9-spirobifluoren-2-yl)-9,9-spirobifluorene
- Synonym: 2,2'':7'',2''''-Ter-9,9'-spirobi[9H-fluorene]
- Melting point: 457 °C (DSC, lit.)
- Glass transition temperature: T g = 231 °C (lit.)
- Absorption: 350 nm in THF
- Fluorescence: 415 nm in THF
- HOMO/LUMO: HOMO = 6.1 eV, LUMO = 3.0 eV
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