Sub-picosecond fluorescence dynamics of organic light-emitting diode tris(8-hydroxyquinoline) metal complexes

For a few complexes belonging to a new class of organic light-emitting diodes (OLED), namely Al(III)– and Ga(III)– tris-8-hydroxyquinoline (Alq 3 and Gaq 3), femtosecond fluorescence up-conversion measurements are reported. The fluorescence decays contain picosecond components when the complexes are...

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Bibliographic Details
Published in:Chemical physics letters 1999-04, Vol.304 (1), p.10-18
Main Authors: Humbs, Werner, van Veldhoven, Emile, Zhang, Hong, Glasbeek, Max
Format: Article
Language:English
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Summary:For a few complexes belonging to a new class of organic light-emitting diodes (OLED), namely Al(III)– and Ga(III)– tris-8-hydroxyquinoline (Alq 3 and Gaq 3), femtosecond fluorescence up-conversion measurements are reported. The fluorescence decays contain picosecond components when the complexes are dissolved in liquid solution. The fast components are not found in the time-resolved fluorescence of the complexes doped in an inert host crystal. The results in liquid solution are characteristic of a dynamic Stokes shift due to the solvation in a ligand-localized excited state. Furthermore, from the temporal behavior of the total fluorescence intensity it is concluded that, concomitant with solvation, adiabatic electron transfer takes place.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(99)00275-4