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Organische Leuchtdioden
Author(s) -
Deußen Martin,
Bässler Heinz
Publication year - 1997
Publication title -
chemie in unserer zeit
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.217
H-Index - 24
eISSN - 1521-3781
pISSN - 0009-2851
DOI - 10.1002/ciuz.19970310205
Subject(s) - electroluminescence , common emitter , optoelectronics , materials science , electrode , oled , electric field , diode , layer (electronics) , electron , yield (engineering) , analytical chemistry (journal) , chemistry , nanotechnology , physics , chromatography , metallurgy , quantum mechanics
An organic light‐emitting diode consists of a thin organic layer sandwiched between electrodes that are capable of injecting a high concentration of electrons and holes when the diode is addressed by an electric field. Electroluminescence results from their bimolecular recombination of a fluorescent singlet state of a chrmophore. High emission intensity requires efficient injection, the elimination of charge carrier discharge at the counterelectrodes and a high photluminescence yield of the emitter. Of crucial importance is the choice of electrode materials and organic components based upon their workfunction and their oxidation/reduction potentials, respectively, in conjunction with the structure of the layer assembly. Corrosioon effects involving H 2 O and O 2 can limit the device's performance severely.