Characteristics of organic electroluminescent device using PDPMA LB film as a hole transport material

Organic electroluminescent (EL) device was fabricated with poly(N-(p-diphenylamine) phenylmethacrylamide) (PDPMA) Langmuir–Blodgett (LB) film as a hole transport material and Alq3 as an emitting material. The PDPMA LB film was prepared by using arachidic acid as an active material. The photoluminescence and electroluminescence properties of organic multi-layered device consisting of ITO/PDPMA LB film/Alq3/Al were investigated. Green emission with a luminance of 400 cd/m2 was achieved at DC drive voltage of 14 V. Especially, PDPMA LB film dramatically lowered the drive voltage of the device to 5 V.