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Bottoms Up: Zinc Oxide Glows

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DURHAM, N.C., Dec. 18, 2008 -- A compound commonly used on babies' bottoms has been made to produce brilliant light best suited to the human eye. Duke University adjunct physics professor Henry Everitt, chemistry professor Jie Liu and their graduate student John Foreman discovered that adding sulfur to ultrafine powders of commonplace zinc oxide -- a cheap and nontoxic ingredient in suntan lotion and diaper rash creme -- at about 1000 °C allows the preparation to convert invisible ultraviolet (UV) light into a remarkably bright and natural form of white light. They are now probing the solid-state chemistry and...Read full article

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    Published: December 2008
    Glossary
    broadband
    Indicating a capability to deal with a relatively wide spectral bandwidth.
    light
    Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    visible
    That term pertaining to the spectral region that can be perceived by the eye.
    wavelength
    Electromagnetic energy is transmitted in the form of a sinusoidal wave. The wavelength is the physical distance covered by one cycle of this wave; it is inversely proportional to frequency.
    white light
    Light perceived as achromatic, that is, without hue.
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