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\section{Light-Emitting Diodes}  \subsection{White Diodes}  White light, created by the full spectrum of visible wavelengths of light, is a key target of LED research, as the the creation of a lamp that will produce efficient lighting is both a challenging task and one in high demand. Current solid-state lamps rely on coating an LED of a more narrow wavelength, such as blue InGaN quantum-well lamps, with doped phosphors\cite{Pimputkar_2009}. These convert the high-frequency blue light into lower frequency red and green light, giving the RGB spectrum commonly used to create white light. However, these phosphors are often quite expensive, and compromise both the cost and efficiency of LEDs.  Zeitan Mi and cowworkers have done much in this field to explore the potential of phosphor-free white LEDs, primarily exploring methods involving InGaN/GaN nanowires. One obstacle was the poor output power of white nanowire LEDs, but in a 2013 paper, Nguyen et al. determined that poor carrier injection efficiency-- an inefficiency that only grew as nanowire diameter shrank-- was responsible for the poor performance of such white LEDs. To combat this, Nguyen et al. utilized InGaN/GaN dot-in-a-wire heterostructures wrapped within an AlGaN shell, which served to minimize the surface recombination that was the root cause of the carrier injection inefficiency. The core-shell heterostructures produced a light that was both significantly more powerful at high current densities, and very white-- spanning the 450-700nm range of the visual spectrum.