Collapse of the Förster energy transfer in doped p -hexaphenylene thin films undergoing crystallization

A fluorescence resonant energy transfer study is presented, which uses composition-spread libraries of para -hexaphenylene doped with tris-(8-hydroxyquinolinato)aluminum(III) ( p 6 P : Al q 3 ) , prepared by a combinatorial physical vapor deposition technique. The p 6 P : Al q 3 libraries deposited...

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Bibliographic Details
Published in:Applied physics letters 2008-05, Vol.92 (20), p.203301-203301-3
Main Authors: Bardizza, G., Caniello, R., Milani, P., Casati, N., Srdanov, V. I.
Format: Article
Language:English
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Summary:A fluorescence resonant energy transfer study is presented, which uses composition-spread libraries of para -hexaphenylene doped with tris-(8-hydroxyquinolinato)aluminum(III) ( p 6 P : Al q 3 ) , prepared by a combinatorial physical vapor deposition technique. The p 6 P : Al q 3 libraries deposited at room temperature are polycrystalline and exhibit an inefficient energy transfer. The energy transfer efficiency increases significantly in amorphous p 6 P : Al q 3 libraries deposited at − 78 ° C , yielding the Förster transfer radius of 22 Å , in good agreement with the theory. The amorphous p 6 P : Al q 3 libraries undergo slow spontaneous crystallization at room temperature accompanied by a gradual collapse of the energy transfer.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2927355