CAS Number 1125547-88-7
SPPO1, 9,9-Spirobifluoren-2-yl-diphenyl-phosphine oxide has a spirobifluorene structure with an electron deficient polar diphenyl-phosphine oxide moiety attached. The polarity in the P=O double bond can lead to a high triplet energy state, which is highly desirable in host materials for an efficient host-to guest energy transfer in an OLED.
SPPO1 can either be used as blue phosphorescent host or, due to its electron deficient nature, in OLED devices as an electron transport/hole blocking layer material. As a phosphorescent host, SPPO1 based blue PHOLEDs show much higher quantum efficiency than the well-known mCP based blue PHOLEDs.
| CAS number | 1125547-88-7 |
|---|---|
| Chemical formula | C37H25OP |
| Molecular weight | 516.57 g/mol |
| Absorption | λmax 317 nm (dichloromethane) |
| Photoluminescence | λem 347 nm (dichloromethane) |
| HOMO/LUMO | HOMO = 6.5 eV, LUMO = 2.8 eV; ET = 2.8 eV [1] |
| Chemical name | 9,9-Spirobifluoren-2-yl-diphenyl-phosphine oxide |
| Synonyms | 2-diphenylphosphine oxide-9,9'-spirobifluorene |
| Classification / Family | Phosphine oxide derivatives, Phosphorescent host materials, Electron transport materials, Hole blocking layer materials, Sublimed materials, Semiconducting small molecules |
| Purity | Sublimed >99.0% (HPLC) |
|---|---|
| Melting point | Tg= 96°C (lit.) |
| Appearance | White powder/crystals |
*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the sublimed materials.
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