Ultraviolet/visible light lamps

Systems that function with the help of visible light are quite common. This relates to the fact that sunlight is a mixture of ultraviolet and visible light. The potentially harmful effects of moderate doses of ultraviolet are overcome by the repair processes triggered by the visible light. Ultraviolet tanning lamps usually eliminate most of the visible light and consequently could be quite harmful if used excessively or even in moderation. 

Sunlamp tests were also run to determine the effectiveness of the compounds under another light source. Eight-mil polypropylene films were exposed in the atmosphere 10 inches below a new 275 watt sunlamp this particular lamp produces visible light and a considerable amount of heat along with the ultraviolet radiation. Results are shown in Table VI. 

Xenon lamp An intense source of ultraviolet, visible and near-infrared light produced by electrical discharge in xenon under high pressure. 

The mercury-free fluorescent lamps and plasma display panels require alternative luminescent materials for efficient conversion of ultraviolet radiation to visible light. The quantum cutting (two photon luminescence or photon-cascade emission) was demonstrated in famous "Eu -Gd " pair" containing system employing the concept of down-conversion, which means that two visible photons are emitted after... 

Over the past decade, there has been considerable development in imaging type detectors for the measurement of ultraviolet (UV) and visible light. These new detectors have attracted the interest of a number of analytical spectroscopists. For absorption spectroscopy, analytical chemists have traditionally used such instruments as the photometer, which uses a narrow-band light source (for example the 254 nm emission line from a low pressure Hg lamp or a continuous source with a filter), a sample cell and a photomultiplier tube (FMT) as the detector. While useful for many specific applications, the single-wavelength photometer cannot determine multiple sample components simultaneously or provide a general absorbance characterization of the system. When information at multiple wavelengths is desired,... 

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