A simple and general approach for controlling optical anisotropy of nanostructured semiconductors is reported. Our design involves the fabrication of liquid crystal devices with built-in semiconductor nanotubes. Quite interestingly, it is found that semiconductor nanotubes can be well aligned along the orientation of liquid crystals molecules automatically, resulting in a very large emission anisotropy with the degree of polarization up to 72%. This intriguing result manifests a way to obtain well aligned semiconductor nanotubes and the emission anisotropy can be easily manipulated by an external bias. The ability to well control the emission anisotropy should open up new opportunities for nanostructured semiconductors, including optical filters, polarized light emitting diodes, flat panel displays, and many other chromogenic smart devices.
The influence on the emission property of CdSe quantum dots arising from propagating surface plasmon polaritons based on interconnected periodic gold nanoarrays with a large area of 1 cm2 is reported. Variation in the structural parameters allows us to tune the surface plasmon resonance to the emission band of quantum dots, which can result in an enhancement up to 54 times in the external quantum efficiency. Our strategy for the enhancement of luminescence efficiency from semiconductor quantum dots should be useful for the creation of high efficiency solid state emitters.
We report the investigation of surface morphologies and transport and optical properties of hydrogenated InN epifilms. The average rms surface roughness decreases from 24nm on the as-grown sample to 13.2nm after hydrogenation. The free electron concentration can be increased or decreased depending on the duration of hydrogenation. The linewidth of the photoluminescence spectra can be reduced, and the peak intensity can be enhanced by about three times. All our results indicate that the physical properties of InN films can be improved by hydrogenation. Possible origins of the underlying mechanism have been proposed to explain the improvement.
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