Xi-Cun Gao

Red to near-infrared electrophosphorescence from a platinum complex coordinated with 8-hydroxyquinoline

A platinum complex coordinated with 2-phenylpyridine and 8-hydroxyquinoline [(phpy)Pt(q)] was synthesized. When (phpy)Pt(q) was used as a guest emitting material in the electrophosphorescent devices, the emission starts at ∼600nm extending to the near-infrared region. The device with 40nm emitting layer of (phpy)Pt(q) doped into N, N′-dicarbazolyl-4, 4′-biphenyl (CBP) exhibits higher luminance and efficiency compared to the device with a layer of 20nm (phpy)Pt(q) doped into CBP combined with a layer of 20nm (phpy)Pt(q) doped into aluminum 8-hydroxyquinoline (Alq3) or a layer of 40nm (phpy)Pt(q) doped into Alq3.

Synthesis of all-deuterated tris(2-phenylpyridine)iridium for highly stable electrophosphorescence: the “deuterium effect”

Device stability and life-time rank the key issues for PhOLEDs. We synthesized deuterated Ir(ppy)3-D24. A device based on it has a current density twenty times higher than and a life-time six times longer than devices based on Ir(ppy)3. The more stable C–D bond is found to be the main contributing factor, called the “deuterium effect”.

N,N′‐Bis(1‐naphthyl)‐N,N′‐diphenyl‐1,1′‐biphenyl‐4,4′‐diamine

The title complex, C44H32N2, is a useful charge-carrier transport material in organic electroluminescence devices. There are two half-molecules in the asymmetric unit; each molecule possesses a centre of symmetry at the mid-point of the central C—C bond.

Synthesis of Triphenylamine-Modified Arylates and Ketones via Suzuki Coupling Reactions

Abstract A series of triphenylamine-mdified arylates and ketones were synthesized via Pd-catalyzed Suzuki coupling reaction of triphenylamine boronic acid with aryl bromide. The triphenylamine boronic acid was synthesized by iodization of 4-bromoaniline, Ullmann reaction of 1-bromo-4-iodobenzene with diphenylamine, and boronic acidification of 4-bromotriphenylamine.