Characteristics of organic electroluminescent device consisting of PDPMA LB film as a polymer hole transport material and Alq3

초록

Organic electroluminescent (EL) device was fabricated with Alq(3) as an emitting material and PDPMA ultra thin film prepared by Langmuir-Boldgett technique as a polymer hole transport layer. A stable condensed PDPMA monolayer was obtained using arachidic acid as a surface active material. The thickness and absorbance of PDPMA LB: film increased Linearly with the layer numbers. The organic multilayered device consisted of ITO/PDPMA LB film (19 layers)/Alq(3)/Al emitted green light with brightness of 2500 cd/m(2) at a DC 14 V. Especially, the drive voltage of EL device having PDPMA LB film of 15 layers exhibited the value as low as 4 V. The effects of thickness control and molecular orientation in the PDPMA LB film on EL performance were discussed.

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