LI Wei-zhi, YANG Xiu, JI Xing-qiao, ZHONG Zhi-you, JIANG Ya-dong. Influence of PVK Hole Transport Layer on Performance of Organic Electroluminescent Devices[J]. Chinese Journal of Luminescence, 2006,27(5): 719-723
LI Wei-zhi, YANG Xiu, JI Xing-qiao, ZHONG Zhi-you, JIANG Ya-dong. Influence of PVK Hole Transport Layer on Performance of Organic Electroluminescent Devices[J]. Chinese Journal of Luminescence, 2006,27(5): 719-723DOI:
With poly (N-vinylcarbazole) (PVK) layer used as hole transport layer (HTL)
influence of thickness of PVKlayer on indium tin oxide (ITO)/PVK/tris-(8-hydroxyquinoline) aluminum (Alq
3
)/Mg:Ag/Al double-layer (DL) device’s performance was investigated.Measurements showed that when the thickness of Alq
3
was fixed to be 50 nm
the device with 18 nm PVK HTLhas the best performance of light emission
e.g
.
the lowest turn-on voltage
the highest brightness and efficiency.Differences between these PVK DLdevices and N
N’-bis-(1-naphthyl)-N
N’-diphenyl-(1
1’-biphenyl)-4
4’-diamine (NPB)/Alq
3
DLdevices’ lifetime were compared.Results showed that the device with thickest PVKlayer has the longest lifetime.The different lifetime between PVKand NPB DLdevice originated from the differences between fabrication techniques and energy band structure of the two HTLs.