29.01.2015
Dawn Dugan specializes in writing books, articles, white papers, reports and special communications for the human resources industry.
A semiconductor LED is a solid-state device that emits incoherent light in a narrow spectral range when a forward bias is applied.
Theatrical Lighting Fixtures are used to light plays, concerts, and other live performances, as well as TV studios and sound stages. Mainstage is proud to provide fixtures from the finest manufacturers such as ETC, Altman, Strand, Lighting & Electronics and Color Kinetics (to name a few).
Fresnel Spotlights: Used primarily where a controllable, soft-edge lighting source is required. She is the co-author of Effective Executive Compensation, which was published by AMACOM in 2008.
The wavelength of the emitted light is dependent on the energy bandgap (Eg) of the material used in the active region of the device.


More and more theatrical lighting is used in areas other than the stage, such as restaurants, churches, nightclubs or exhibits. They are available wired for three or four circuit operation for color separation or blending. An LED consists of a p–n junction with a multiple-QW active region and carrier-confining layers.
Moving fixtures are controlled by electronics and re-programmed for a variety of effects including moving, color changing and image rotation or change. The LED structure is normally formed on a lattice-matched, or nearly lattice-matched, substrate with a low dislocation density.
However, in the case of III-nitride semiconductors, sapphire (which has about 16% lattice mismatch with GaN) is the most common substrate of choice owing to the fact that bulk lattice-matched substrates are not readily available. The active region typically consists of confinement layers (n-type and p-type) with either a single or multiple QWs between them.


The alloy compositions of the well and barrier layers and their thicknesses are chosen based on the desired emission wavelength.
Most of the III-nitride-based UV LED structures are grown by MOCVD, although other methods such as molecular beam epitaxy and HVPE have also been used to a lesser extent.The performance of an LED is characterized by its wall-plug efficiency, which is the optical power output of the LED divided by the electrical power supplied to the device. This is a function of the internal quantum efficiency (the number of photons generated in the active region per electron injected into the LED) and the extraction efficiency (number of photons that are emitted from the LED chip per photon generated in the active region).



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