SPPO13, or 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene (CAS 1234510-13-4), is a small-molecule semiconductor for organic electronics. It can be processed from solution and serves as an n-type electron transport layer (ETL) material in OLEDs and related light-emitting devices.
The molecule pairs an electron-donating spirobifluorene core with two identical electron-withdrawing diphenylphosphine oxide groups, which makes it electron deficient. The related SPPO1 carries only one such group. When SPPO13 is blended with a hole transporting material such as TCTA, the mixture works as a universal bipolar co-host for blue, green and red phosphorescent emitters.
Ossila supplies SPPO13 as a white powder or crystals with a purity above 99.0% by HPLC. Reported values include HOMO 5.90 eV, LUMO 2.60 eV and a glass transition temperature of 123°C. Inverted OLEDs using SPPO13:TCTA co-hosts have reached a maximum EQE of 15.2% (blue), 16.3% (green) and 10.8% (red).
- Solution-processed electron transport layers in organic light-emitting diodes.
- Bipolar co-host, blended with TCTA, for blue, green and red phosphorescent OLEDs (PHOLEDs).
- Simplified two-layer blue phosphorescent OLED architectures.
- Research on TADF light-emitting diodes and other organic electronic devices.
- n-type host material in light-emitting electrochemical cells.
| Brand | Ossila |
|---|---|
| CAS number | 1234510-13-4 |
| Molecular formula | C49H34O2P2 |
| Purity | >99.0% (HPLC) |
| Category | — |
| Pack sizes | 250 mg, 500 mg, 1 g |
| Physical form | White powder/crystals |
| Storage | — |
- Product code: M2333A1
- Product code: M2333A1
- Full name: 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene
- Synonym: 9,9'-spirobi[fluorene]-2,7-diylbis(diphenylphosphine oxide)
- Molecular weight: 716.74 g/mol
- Glass transition temperature: Tg = 123°C
- Absorption: λ max 282 nm (in DCM)
- Phosphorescence: λ max 373 nm (in DCM)
- HOMO/LUMO: HOMO 5.90 eV, LUMO 2.60 eV
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