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<p><a href="page.php?w=Image%3AQuantum_efficiency_graph_for_WFPC2-en.svg">thumb</a>The <b>quantum efficiency</b> (<b>QE</b>) of a <a href="page.php?w=photodetector">photodetector</a> is a measure of its electrical response to light. Another name for it is <b>incident photon to converted electron</b> (<b>IPCE</b>) <b>ratio</b>.</p>

<p>In a <a href="page.php?w=charge-coupled_device">charge-coupled device</a> (CCD) or other photodetector, quantum efficiency is the ratio between the number of <a href="page.php?w=charge_carrier">charge carrier</a>s</p><p>
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