Photoconduction in the Metal Chelate Tris-(8-hydroxyquinolinato) Aluminium (Alq3)

• Autorzy: Kalinowski J. , Stampor W. , Szmytkowski J.
• Języki publikacji: EN

Abstrakty

EN

Electric field, light wavelength and excitation intensity characteristics of photoconduction have been measured in an aluminum (Al)/tris-(8-hydroxyquinolinato) aluminum( III) (Alq3)/Al sandwich system. The results show the photocurrent to be underlain by intrinsic dissociation of singlet excited states (Alq3 * ) into a pair of free electrons and holes. However, conventional theories, such as Onsager or Poole-Frenkel models for charge photogeneration cannot account for the experimentally observed characteristics. Excellent agreement with experiment is provided by the 3D-Onsager theory of geminate recombination combined with volume (bimolecular) recombination of the photogenerated space charge. This model predictions are also consistent with independent electric field-induced fluorescence quenching experiments and are able to account for the decrease in the electroluminescence quantum efficiency of Alq3-based organic light-emitting diodes at high electric fields.

Słowa kluczowe

EN

photoconduction in organics; electromodulation spectroscopy; dissociation of excitions; charge carrier recombination; organic light emitting diodes

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 2-3
• Strony: 249--262
• Opis fizyczny: Bibliogr. 27 poz., rys.

Twórcy

autor

Kalinowski J.

• Department of Molecular Physics, Technical University of Gdańsk, ul. G. Narutowicza 11/12, 80-952 Gdańsk, Poland

autor

Stampor W.

• Department of Molecular Physics, Technical University of Gdańsk, ul. G. Narutowicza 11/12, 80-952 Gdańsk, Poland

autor

Szmytkowski J.

• Department of Molecular Physics, Technical University of Gdańsk, ul. G. Narutowicza 11/12, 80-952 Gdańsk, Poland

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