Direct observation of junction formation in polymer light-emitting electrochemical cells
- 15 January 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 59 (4) , R2482-R2485
- https://doi.org/10.1103/physrevb.59.r2482
Abstract
Electroabsorption (EA) measurements are used to determine the electric fields in polymer light-emitting electrochemical cells (LEC’s). The EA signals are measured as a function of the dc bias and are found to increase abruptly above a threshold voltage. The EA measurements are compared with the capacitance-voltage and current-voltage characteristics. Calculations using a model based on electrochemical junction formation are in agreement with all of the experimental observations. These results show unambiguously that the picture of electrochemical junction formation in LEC’s is correct.Keywords
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