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Direct determination of the emission zone in a polymer light‐emitting diode
Author(s) -
Grüner Johannes,
Remmers Marcus,
Neher Dieter
Publication year - 1997
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/adma.19970091207
Subject(s) - electroluminescence , materials science , exciton , light emitting diode , optoelectronics , diode , quenching (fluorescence) , electrode , recombination , polymer , polarization (electrochemistry) , spontaneous emission , optics , nanotechnology , condensed matter physics , fluorescence , composite material , chemistry , physics , laser , biochemistry , layer (electronics) , gene
Many operating mechanisms of polymer light‐emitting diodes (LEDs) are still not fully understood, among them the crucial step of recombination of oppositely charged carriers to form excitons. Questions related to this step are: What is the shape of the recombination zone and what is the quenching loss at the metal electrode layers? An investigation is reported in which the emission zone is directly determined by analyzing the polarization of teh electroluminescence. It is shown that exciton quenching near the electrodes is a crucial parameter for the overall device efficiency.