Because ionized polyurethane-poly(ethylene glycol) copolymer(PUI) and poly[1

4-(2

5-bis(1

4

7-ethoxy) phenylene vinylene)-alt-1

4-(phenylene vinylene)](BETO-PPV) can be mixed well

we use PUI as polymer electrolyte and BETO-PPV as luminescent polymer to fabricate light-emitting electrochemical cell (SLEC). The device structure is identical to traditional LEC. The fabrication of SLEC and measurement of the electrical and electroluminescent characteristics were reported

and the experimental results were discussed by an electrodynamic model. Experiments and analyses show

because of congregate of cations

SLEC has a low turn-on voltage and Al can be employed as cathode as traditional LEC. Due to low density of immobile anions in PUI

steady-state current-voltage character depends on the height of the barrier for hole injection. So the curve of SLECs steady-state current-voltage character is imsymmetrical. In addition

the most important characteristic of SLEC is the fast light-emitting response. The response time of SLEC is about 10 ms

faster two orders of magnitude under a fixed bias than that of traditional LEC. By analyses of chemical character of BETO-PPV and PUI

it shows that oligo(ethylene oxide) side groups of BETO-PPV chains are stick to PUI chains so that the compound film of PUI and BETO-PPV forms a continuous network phase enabling fast ion transport. Another reason enabling fast ion transport is that a local ordered potential formed by fixed anions of SLEC forms less scatter for mobile cations than the disordered potential formed by mobile anions of traditional LEC.

C-f

characteristics conform SLECs fast time response.