Direct observation of junction formation in polymer light-emitting electrochemical cells

Authors
Gao, J Heeger, AJ Campbell, IH Smith, DL
Citation
J. Gao et al., Direct observation of junction formation in polymer light-emitting electrochemical cells, PHYS REV B, 59(4), 1999, pp. R2482-R2485
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
59
Issue
4
Year of publication
1999
Pages
R2482 - R2485
Database
ISI
SICI code
0163-1829(19990115)59:4<R2482:DOOJFI>2.0.ZU;2-J
Abstract
Electroabsorption (EA) measurements are used to determine the electric fiel ds in polymer light-emitting electrochemical cells (LEC's). The EA signals are measured as a function of the de bias and are found tp increase abruptl y above a threshold voltage. The EA measurements are compared with the capa citance-voltage and current-voltage characteristics. Calculations using a m odel 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. [S0163- 1829(99)51204-6].