Nelson Tansu, Professor in the department of electrical engineering and computing, and Volkmar Dierolf, professor of physics, both at Lehigh University, has received a three-year grant from the Department of Energy United States study methods can improve the efficiency of light emitting diodes (LEDs for their acronym in English) white.
The electricity for lighting is an important rate. For example, in the United States, about 22 percent of electricity used for lighting.
But when using this energy to light by an incandescent lamp, over 95 percent of this energy is dissipated as heat or infrared light invisible.
A typical fluorescent lamp is about four times more efficient than incandescent bulbs, but it contains mercury, which can pose some environmental and health risks.
A much better option lies in the solid state lighting, a technology that is supported by the LEDs, in which light is emitted from semiconductor materials. LEDs used for backlighting liquid crystal displays in notebook computers and televisions, as well as displays of mobile phones and car dashboards, and are also used in an increasing number of traffic signals and highway billboards and cities.
LED technologies that color these electronic displays have the potential to increase 10 to 15 times or more the energy efficiency of a typical incandescent bulb. LED technology also promises to reach two to three times energy efficient fluorescent lamps.
By significantly improving the efficiency of 22 percent of the electricity we use today for lighting, solid state lighting can significantly reduce the global demand for energy, while lighting systems provide more robust and environmentally safe.
light generated by an LED is emitted from a semiconductor material, usually indium gallium nitride (InGaN) or gallium phosphide (GaP), within the LED. A semiconductor is an element or compound that transmits electricity under certain conditions.
A semiconductor light emitting InGaN blue parts and green spectrum, and a semiconductor GaP emits light in the red spectrum. A white LED to mix these colors in the correct proportion to produce white light. This can be done by converting the wavelength or by mixing colors, which combine multiple LEDs, each the size of a human hair, in a single lamp to produce white light.
The problem is the relative inefficiency of the green light produced by an LED. When combined with red LED light and the blue LED to produce white light, this inefficiency limits the overall radiation efficiency white LED light.
The electricity for lighting is an important rate. For example, in the United States, about 22 percent of electricity used for lighting.
But when using this energy to light by an incandescent lamp, over 95 percent of this energy is dissipated as heat or infrared light invisible.
A typical fluorescent lamp is about four times more efficient than incandescent bulbs, but it contains mercury, which can pose some environmental and health risks.
A much better option lies in the solid state lighting, a technology that is supported by the LEDs, in which light is emitted from semiconductor materials. LEDs used for backlighting liquid crystal displays in notebook computers and televisions, as well as displays of mobile phones and car dashboards, and are also used in an increasing number of traffic signals and highway billboards and cities.
LED technologies that color these electronic displays have the potential to increase 10 to 15 times or more the energy efficiency of a typical incandescent bulb. LED technology also promises to reach two to three times energy efficient fluorescent lamps.
By significantly improving the efficiency of 22 percent of the electricity we use today for lighting, solid state lighting can significantly reduce the global demand for energy, while lighting systems provide more robust and environmentally safe.
light generated by an LED is emitted from a semiconductor material, usually indium gallium nitride (InGaN) or gallium phosphide (GaP), within the LED. A semiconductor is an element or compound that transmits electricity under certain conditions.
A semiconductor light emitting InGaN blue parts and green spectrum, and a semiconductor GaP emits light in the red spectrum. A white LED to mix these colors in the correct proportion to produce white light. This can be done by converting the wavelength or by mixing colors, which combine multiple LEDs, each the size of a human hair, in a single lamp to produce white light.
The problem is the relative inefficiency of the green light produced by an LED. When combined with red LED light and the blue LED to produce white light, this inefficiency limits the overall radiation efficiency white LED light.
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