Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5276912 | Tetrahedron Letters | 2011 | 4 Pages |
Novel hole-transporting materials based on carbazole dendrimers, namely G1CBC and G2CBC were synthesized and characterized. They are thermally stable with high glass transition temperatures (Tg) up to 245 °C and exhibit chemically-stable redox processes. Double-layer green OLEDs using these materials as the hole-transporting layer (HTL) with the device configuration of ITO/HTL/Alq3/LiF:Al emit brightly (λem 522-534 nm) from the Alq3 layer with a maximum luminance and low turn-on voltage of 15,890 cd/m2 and 3.0 V, respectively. Their ability as HTLs in terms of device performance is comparable to the common hole-transporter N,Nâ²-diphenyl-N,Nâ²-bis(1-naphthyl)-(1,1â²-biphenyl)-4,4â²-diamine (NPB), however their thermal properties were far greater than both NPB and N,Nâ²-bis(3-methylphenyl)-N,Nâ²-bis(phenyl)benzidine (TPD).
Graphical abstractDownload full-size image