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Atomic/molecular layer deposition of europium-organic thin films on nanoplasmonic structures towards FRET-based
Amr Ghazy1, Jonas Ylönen2, Nagarajan Subramaniyam2
1Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland. maarit.karppinen@aalto.fi.
Abstract:
We present a novel atomic/molecular layer deposition (ALD/MLD) process for europium-organic thin films based on Eu(thd)3 and 2-hydroxyquinoline-4-carboxylic acid (HQA) precursors. The process yields with appreciably high growth rate luminescent Eu-HQA thin films in which the organic HQA component acts as a sensitizer for the red Eu3+ luminescence, extending the excitation wavelength range up to ca. 400 nm. We moreover deposit these films on nanoplasmonic structures to achieve a twentyfold enhanced emission intensity. Finally, we demonstrate the FRET-type energy transfer process for our Eu-HQA coated nanoplasmonic structures in combination with commercial Alexa647 fluorophor, underlining their potential towards novel bioimaging applications.
