Excitation-dependent fluorescence from atomic/molecular layer deposited sodium-uracil thin films
Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland
Department of Chemistry and Materials Science, Aalto University, Aalto, Finland
COMP Centre of Excellence in Computational Nanoscience, Department of Applied Physics, Aalto University, Aalto, Finland
Departamento de Facultad de Ciencias Básicas, Universidad de Medellín, Carrera 87 # 30-65, Medellín, Colombia
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Atomic/molecular layer deposition (ALD/MLD) offers unique possibilities in the fabrication of inorganic-organic thin films with novel functionalities. Especially, incorporating nucleobases in the thin-film structures could open new avenues in the development of bio-electronic and photonic devices. Here we report an intense blue and widely excitation-dependent fluorescence in the visible region for ALD/MLD fabricated sodium-uracil thin films, where the crystalline network is formed from hydrogen-bonded uracil molecules linked via Na atoms. The excitation-dependent fluorescence is caused by the red-edge excitation shift (REES) effect taking place in the red-edge of the absorption spectrum, where the spectral relaxation occurs in continuous manner as demonstrated by the time-resolved measurements. © 2017 The Author(s).
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