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Energetics of mer/fac isomers in metal tris(8-hydroxyquinoline) chelates: Implications on charge conduction in organic light-emitting devices

Published online by Cambridge University Press:  15 February 2011

Kim F. Ferris ,
Linda S. Sapochak ,
Deanna Rodovsky  and
Paul E. Burrows
Kim F. Ferris
Affiliation:
Materials Science Division Pacific Northwest National Laboratory Richland, WA 99352
Linda S. Sapochak
Affiliation:
Materials Science Division Pacific Northwest National Laboratory Richland, WA 99352
Deanna Rodovsky
Affiliation:
Materials Science Division Pacific Northwest National Laboratory Richland, WA 99352
Paul E. Burrows
Affiliation:
Materials Science Division Pacific Northwest National Laboratory Richland, WA 99352
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Abstract

Electronic structure calculations for the mer and fac-isomers of aluminum tris (8-hydroxyquinoline) (Alq3) and the methyl-substituted series, nMeq3Al (n = 3 - 7) are presented. From these data, we estimate their relative abundances in Alq3 thin films and the resultant trap state energies. Ab initio computations performed at the SCF level suggest a significantly higher stability (6 - 7.5 kcal/mol) of the mer-isomer over the facial form, whereas MP2 treatment of electron correlation effects lowers the difference to (4 - 4.5 kcal/mol). Substitution of the Al+3 metal ion with the larger ions Ga+3 and In+3 increases the energetic preference of the meridianal form by 2.7 kcal/mol and decreases it by 0.8 kcal/mol, respectively. Trap state energies calculated by previously proposed methodologies show little difference between mer and fac trap states. These results suggest that the existence of the facial isomer in thin films of metal trisquinolates is unlikely to significantly affect charge conduction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L3.3
Copyright
Copyright © Materials Research Society 2003

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