Topic
Halogen lamp
About: Halogen lamp is a research topic. Over the lifetime, 4162 publications have been published within this topic receiving 28847 citations. The topic is also known as: tungsten halogen lamp & quartz-halogen lamp.
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TL;DR: In this paper, the authors reviewed the status of phosphors for LEDs and prospect the future development and proposed new phosphors that can absorb excitation energy from blue or nUV LEDs and generate visible emissions efficiently.
Abstract: White light-emitting diodes (WLEDs) have matched the emission efficiency of florescent lights and will rapidly spread as light source for homes and offices in the next 5 to 10 years. WLEDs provide a light element having a semiconductor light emitting layer (blue or near-ultraviolet (nUV) LEDs) and photoluminescence phosphors. These solid-state LED lamps, rather than organic light emitting diode (OLED) or polymer light-emitting diode (PLED), have a number of advantages over conventional incandescent bulbs and halogen lamps, such as high efficiency to convert electrical energy into light, reliability and long operating lifetime. To meet with the further requirement of high color rendering index, warm light with low color temperature, high thermal stability and higher energy efficiency for WLEDs, new phosphors that can absorb excitation energy from blue or nUV LEDs and generate visible emissions efficiently are desired. The criteria of choosing the best phosphors, for blue (450-480 nm) and nUV (380-400 nm) LEDs, strongly depends on the absorption and emission of the phosphors. Moreover, the balance of light between the emission from blue-nUV LEDs and the emissions from phosphors (such as yellow from Y3Al5O12:Ce3+) is important to obtain white light with proper color rendering index and color temperature. Here, we will review the status of phosphors for LEDs and prospect the future development.
478 citations
Patent•
03 Mar 1994
TL;DR: In this paper, a light emitting diodes are placed within a standard glass or plastic bulb envelope in arrangements capable of providing even illumination from the lamp, which is intended as a retrofit for incandescent lamps having such bases in illuminated signs such as exit signs.
Abstract: A retrofittable lamp using light emitting diodes as the illumination source, the lamp is fitted with any one of the common lamp bases and is intended as a retrofit for incandescent lamps having such bases in illuminated signs such as exit signs and the like. The invention contemplates the packaging of a number of light emitting diodes in a circuit usually having a current limiting device to allow LED operation at a desired current level. The light emitting diodes are placed within a standard glass or plastic bulb envelope in arrangements capable of providing even illumination from the lamp.
388 citations
TL;DR: Besides the difference of irradiance when compared with halogen lamps, LED-based devices show to be a promising alternative curing instrument and further development in instrumentation may result in devices even more efficient than conventional lamps.
289 citations
TL;DR: In this article, an advanced magneto-optical technique is described, which allows simultaneous determination of two mutuallyconjugate parameters (Kerr rotation and reflectance magnetocircular dichroism) using a piezo-birefringent modulator.
Abstract: An advanced magneto-optical technique is described, which allows simultaneous determination of two mutually-conjugate parameters–Kerr rotation and reflectance magneto-circular dichroism–using a piezo-birefringent modulator. This technique provides a sensitivity of 0.002° for Kerr rotation at λ=500 nm with 12 nm resolution, using a halogen lamp (150 W) as the light source. The wavelength region covered by the method can be extended from 300–2500 nm by suitable selection of gratings and light detectors. The new technique was used to measure magneto-optical hysteresis loops for several wavelengths and magneto-optical spectra on an rf-sputtered amorphous Gd-Co film, and the results are reported here.
260 citations
01 Jan 1982
TL;DR: In this article, an advanced magneto-optical technique is described, which allows simultaneous determination of two mutuallyconjugate parameters (Kerr rotation and reflectance magnetocircular dichroism) using a piezo-birefringent modulator.
Abstract: An advanced magneto-optical technique is described, which allows simultaneous determination of two mutually-conjugate parameters–Kerr rotation and reflectance magneto-circular dichroism–using a piezo-birefringent modulator. This technique provides a sensitivity of 0.002° for Kerr rotation at λ=500 nm with 12 nm resolution, using a halogen lamp (150 W) as the light source. The wavelength region covered by the method can be extended from 300–2500 nm by suitable selection of gratings and light detectors. The new technique was used to measure magneto-optical hysteresis loops for several wavelengths and magneto-optical spectra on an rf-sputtered amorphous Gd-Co film, and the results are reported here.
251 citations