Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.349, 383-388, 2000
Polymer electroluminescent devices of poly(4,4'-triphenyl amine-diylvinylene-alt-4,4'-diphenyl-sulfone-vinylene) (PTASV)
PTASV was newly synthesized through the Wittig reaction and characteristics of various types of LEDs using this polymer were investigated, A single layer device (ITO/PTASV/Al) showed green emission at about 540 nm with the threshold voltage of 20 V. When a thin UF layer was inserted to the PTASV/Al interface, the external quantum efficiency was increased about 10 times that of the single layer device with lower threshold voltage. The external quantum efficiency of the device with heterojunction structure (ITO/PTASV/Alq(3)/LiF/Al) was 0.01 % at current density of 8 mA/cm(2), in air and at room temperature.