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<p>processes (e.g., vibrational relaxation, <a href="page.php?w=Internal_conversion_%28chemistry%29">internal conversion</a>, or <a href="page.php?w=intersystem_crossing">intersystem crossing</a>) can dissipate the excitation energy as heat instead of light, reducing luminescence efficiency.</p>

<p><big>Fluorescence and phosphorescence</big></p>
<p>In common usage, luminescence is frequently discussed in terms of <a href="page.php?w=fluorescence">fluorescence</a> and <a href="page.php?w=phosphorescence">phosphorescence</a>.</p>

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* <b>Fluorescence</b> is</p><p>
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