BCBP, full name 2,2'-bis(4-(carbazol-9-yl)phenyl)-biphenyl, has a bridged biphenyl structure with two electron rich carbazolyl pendant moieties. The bridged structure is believed to enhance the conjugation and raise the HOMO energy level, facilitating hole-injection and leading to low turn-on voltages in organic photoelectroluminescent devices.
Comparing with CBP, a well-known host material, BCBP is thermally more stable with a high glass transition temperature (Tg) of 173 °C, while CBP has a relatively low Tg of 69 °C.
Carbazolyl groups are largely embedded in both fluorescent and phosphorescent host materials because of their higher triplet energy levels and higher hole mobility. Like the rest of the family, BCBP is commonly used as host material for blue, green, and red phosphorescent dopants in highly efficient OLED devices.
* Measurable with a USB spectrometer
Tg = 173 °C (lit.)
TGA: >330 °C (0.5% weight loss)
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.