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<p>doping is better known as <a href="page.php?w=activator_%28phosphor%29">activation</a>; this is not to be confused with <a href="page.php?w=dopant_activation">dopant activation</a> in semiconductors. Doping is also used to control the color in some pigments.</p>

<p><big>History</big></p>
<p>The effects of impurities in semiconductors (doping) were long known empirically in such devices as <a href="page.php?w=crystal_radio">crystal radio</a> <a href="page.php?w=Cat%27s-whisker_detector">detectors</a> and <a href="page.php?w=selenium_rectifiers">selenium rectifiers</a>.</p><p>
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