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nanotechweb.org spring round-up


     

We look at the top stories on nanotechweb.org over the first three months of 2015.

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LEDs

Using nanotechnology to enhance the performance of LEDs and other light sources

Lab talk

Nanotechnology research highlights: find out what the authors have to say

Ultra-thin multilayer films reveal surprising optical properties

Breaking down the ‘effective medium’ approach for sensing applications.

Artificial magnetism provides perfect electromagnetic absorbers

Patterning graphene for a tunable terahertz absorber.

Near-field transducers for next-generation hard-drive technology

Overcoming thermal issues with plasmonic nanostructures in heat-assisted magnetic recording.

Graphene nanoribbons steer infrared light

Controlling the reflection of infrared light using an aperiodic array of graphene strips.

Single-layer graphene electrodes

Replacing indium tin oxide with graphene for high-efficiency quantum-dot light-emitting diodes.

Ultraviolet light-emitting diodes: high efficiency and low cost

High-temperature growth enables short emission wavelength LEDs based on wide band gap semiconductors.

Controlling carbon nanotube photoluminescence

Silicon microring resonators could be key to carbon nanotube-based light sources.

Controlling emission from one dimensional photonic crystals for improved detection

Using near-field coupled emission can enhance or direct fluorescence

Ordered In(Ga)N nanocolumns grown on silicon

Rod-like structures fabricated via selective area growth process are ideal for LED applications and can be tuned across wide spectral range

Nanowires grown on polycrystalline silicon

Freestanding nanowires on glass-based polycrystalline silicon could improve light-emitting devices.

Understanding today the light sources of tomorrow

Resolving the debate on the radiative recombination mechanism in next-generation high-efficiency, phosphor-free, white LEDs.

Laser beam exfoliates graphite to form chemically tunable platform

Green synthesis route produces free-standing reduced graphene oxides at water–air interface.

ZrO2 nanoparticles boost colour temperature uniformity in white LEDs

Deviations in angular-dependent correlated colour temperature could be improved by 58%.

Seed particles govern nanowire growth and properties

Gold-seeded GaN nanowires grow slower compared with nickel-seeded ones and also contain 2D defects that are seldom found in nickel-seeded GaN nanowires.

Analysis compares growth mechanisms of Zn-polar ZnO nanowires on O-polar ZnO and on sapphire

Understanding how nanowires grow on different substrates will help developers to optimize the performance of devices such as photovoltaic solar cells, nano-generators and light-emitting diodes

Metallic ferrofluids show optical limiting

Nickel nanofluid with kerosene base displays optical limiting and magnetic field dependent transmission

Time-resolved fluorescence spectroscopy looks deeper into germanium nano-islands in silicon

Fluorescence spectra with nanosecond temporal resolution reveal charge-recombination dynamics at a glance

Vectorial recipe serves up a Xe'ek of multi-waves

Combined action of metallic nanosystems gives ultrafast all-optical phase modulation

InGaN/GaN heterostructures: building blocks for solid-state lighting

Optical analysis of single nanowire emission identifies main source of loss and reveals route for improving the performance of nanoLEDs

Electron beam lithography forms 2D hybrid photonic crystal slab

Nanocrystal inclusions allow developers to manipulate refractive index and light-emitting properties of polymer film