Frequency response of molecularly thin alternating current light-emitting diodes

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Osterbacka R, Pal AJ, Kallman KM, Stubb H
Förläggare: AMER INST PHYSICS
Publiceringsår: 1998
Tidskrift: Journal of Applied Physics
Tidskriftsakronym: J APPL PHYS
Volym: 83
Nummer: 3
Artikelns första sida, sidnummer: 1748
Artikelns sista sida, sidnummer: 1752
Antal sidor: 5
ISSN: 0021-8979
eISSN: 1089-7550


Abstrakt

The frequency response of molecularly thin alternating-current polymeric light-emitting diodes has been studied. Langmuir-Blodgett (LB) films of poly(3-hexylthiophene) (PHT) were used as the active emitting material and the device was formed by sandwiching PHT films between LB films of emeraldine base polyaniline. As a step towards molecular electronic devices, we have shown that even two molecular layers of PHT (approximate to 6 nm) are sufficient for light emission. The high frequency operation limit of the device has been discussed in terms of a charge accumulation process at the polymer-polymer interface. The electroluminescence (EL) spectra of different structures have been compared with corresponding photoluminescence spectra. A significant blueshift in EL has been observed in thinner structures and its origin has been discussed. (C) 1998 American Institute of Physics. [S0021-8979(98)02103-3].

Senast uppdaterad 2019-12-11 vid 04:47