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Comparison of the Internal Field Distribution in Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells
Author(s) -
Moderegger E.,
Wenzl F. P.,
Tasch S.,
Leising G.,
Scherf U.,
Annan K. O.
Publication year - 2000
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/(sici)1521-4095(200006)12:11<825::aid-adma825>3.0.co;2-t
Subject(s) - light emitting diode , materials science , optoelectronics , electrochemical cell , diode , doping , electrochemistry , electroluminescence , electric field , voltage , blue light , nanotechnology , electrode , electrical engineering , chemistry , physics , engineering , layer (electronics) , quantum mechanics
Light‐emitting polymer electrochemical cells (LECs) emit brighter light at lower voltages in comparison to conventional LEDs. The fundamental mode of operation of LECs is investigated here: The internal electrical field distribution was determined for LECs based on methyl‐substituted ladder‐type poly( p ‐phenylene) (mLPPP) using electroabsorption measurements as a function of an external bias voltage. These results were compared to measurements on mLPPP LEDs, and a model for the working principle of both types of devices is presented, showing that electrochemical doping is important in LECs.