Orbital occupation in electron-charged CdSe quantum-dot solids

Article Abstract:

High-quality assemblies of monodisperse CdSe quantum dots are prepared and a combination of electrochemical gating and electrical and optical techniques are employed to study orbital occupation in the quantum-dot solids. By using a simple electron-repulsion model, observed differences in the electron-addition energy for different samples, the broadening of the electron occupation as a function of electrochemical potential and the strong dependence of the electron-addition energy on nanocrystal diameter are explained.

Electric properties, Quantum theory, Quantum mechanics

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Variations in steady-state and time-resolved background luminescence from surface-enhanced resonance Raman scattering-active single Ag nanoaggregates

Article Abstract:

Steady-state variations and time-resolved blue-shifts in the surface-enhanced resonance Raman scattering background luminescence of single Ag nanoaggregates adsorbed with rhodamine 6G ( R6G) molecules are investigated. The origin of the background luminescence is attributed to luminescence from several kinds of aggregates after considering pioneering work that dealt with the affinity of R6G molecules to Ag surfaces and aggregation of R6G molecules.

Silver compounds, Luminescence, Raman effect, Chemical properties

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Subsecond luminescence intensity fluctuations of single CdSe quantum dots

Article Abstract:

Photoluminescence (PL) intermittency characteristics are examined for single quantum dots (QDs) in a CdSe QD sample synthesized at a slow rate at 75 degree Celsius. Although the PL quantum efficiency was relatively low, the PL intensity of single CdSe QDs is noticed to be fluctuated on a subsecond time scale with short-lived on and off states.

Japan, Observations, Quantum chemistry, Photoluminescence

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