Y. Fagot-Revurat

Observation of a nanoscale phase separation in blue-emitting Ce-doped SiO1.5 thin films

Both the optical and structural properties of Ce-doped SiO1.5 thin films were investigated. The Ce-related blue luminescence, which can be seen even at room temperature for as-grown films, exhibits a rather complex evolution with the annealing temperature. In particular, a strong decrease is observed when the films are annealed at 900 °C. Structural characterizations combining scanning transmission electron microscopy and atom probe tomography reveal the formation of Si- and Ce-rich clusters at this temperature, thus demonstrating that the decreasing Ce-related luminescence is due to concentration induced quenching. For annealing temperatures higher than 900 °C, the Ce-related luminescence increases. The different structural characterizations provide clear experimental evidence of a phase separation occurring at the nanoscale between pure Si nanocrystals and Ce-rich clusters having a stoichiometry close to the cerium silicates Ce2Si2O7 or Ce4.667(SiO4)3O. The latter compounds are optically active thereby explaining the increased Ce-related luminescence observed at the highest annealing temperature.

Band structure and Fermi surfaces of the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2

The electronic structure of the reentrant superconductor Eu(Fe

Understanding the insulating nature of alkali-metal/Si(111):B interfaces

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Interplay between structural, chemical, and spectroscopic properties of Ag/Au(111) epitaxial ultrathin films : A way to tune the rashba coupling

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Interacting quantum box superlattice by self-organized Co nanodots on Au(788)

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Structure of chlorine on Ag(111): Evidence of the (3×3) reconstruction

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Imaging a buried interface by scanning tunneling spectroscopy of surface states in a metallic system

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Chlorine adsorption on Cu(111) revisited: LT-STM and DFT study

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Electron-phonon coupling on strained Ge/Si(111)-(5×5) surfaces

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Commensurate-incommensurate phase transition in chlorine monolayer chemisorbed on Ag(111): Direct observation of crowdion condensation into a domain-wall fluid

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