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Infrared spectroscopy of electroluminescent conjugated polymers
Author(s) -
Furukawa Yukio,
Furukawa Shinobu,
Maekawa Shino,
Ishima Mitsuru
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)184:1<99::aid-masy99>3.0.co;2-h
Subject(s) - electroluminescence , materials science , infrared , optoelectronics , polymer , infrared spectroscopy , diode , light emitting diode , semiconductor , charge carrier , absorption spectroscopy , analytical chemistry (journal) , optics , chemistry , nanotechnology , organic chemistry , physics , layer (electronics) , composite material
The infrared spectra of the light‐emitting diodes and the metal‐insulator‐semiconductor devices based on a poly(p‐phenylenevinylene) derivative MEH‐PPV have been measured in situ with a reflection configuration. The voltage‐induced infrared spectra of these devices have been measured by the FT‐IR difference‐spectrum method. The observed bands have been attributed to the carriers injected into the polymer layers. The observation of positive carriers in the polymer light‐emitting diode is probably related to the predominance of injected positive carriers, which is one of the factors in the low efficiency of the polymer light‐emitting diode. In situ infrared reflective absorption measurements provide the information about injected carriers, which play a central role in the properties and the functions of polymer electronic devices.