| Popis: |
A novel –OPhCN substituted polythiophenic copolymer (with 3-hexylthiophene, PHT, as an internal plastifying agent), named PTOPhCN, has been used as active material for the realization of electroluminescent devices. The polymer possesses in the solid state (thin film) an evident and bright photoluminescence with a double emission peak between 570 and 650 nm in film. In solution the PTOPhCN emission is slightly blue-shifted. PTOPhCN is well processable from many solvents (CHCl3, chlorobenzene, THF, etc), and it forms smooth, free-standing and amorphous films of thicknesses ranging from 10 to 400-500 microns, by drop casting or spin coating. Basic monolayer devices based on PTOPhCN have been realized, with different thicknesses. The devices have been tested for J-V curves and EL. In general, the EL characteristics of these devices are very interesting, since also without any hole injecting layer current densities as high as 250 A/m2. Moreover, in a new experimental setup (EL measured from the ITO side) a 80 nm-thick single layer device gave a turn-on voltage of 4 V. |
