Excitation-dependent fluorescence from atomic/molecular layer deposited sodium-uracil thin films

Ville Pale, Zivile Giedraityte, Xi Chen, Olga Lopez Acevedo, Ilkka Tittonen, Maarit Karppinen

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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.
Original languageEnglish
Article number6982
Pages (from-to)1-7
Number of pages7
JournalScientific Reports
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


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