<?xml version="1.0" encoding='utf-8'?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card id="card1" title="Photon upconversion - Page 3 - Wikipedia">
<p>
<a accesskey="1" href="page.php?w=Photon_upconversion&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=Photon_upconversion&amp;p=4">3.Next</a>
</p>
<p>elements. Examples of these ions are <a href="page.php?w=lanthanides">Ln</a><sup>3+</sup>, <a href="page.php?w=titanium">Ti</a><sup>2+</sup>, <a href="page.php?w=nickel">Ni</a><sup>2+</sup>, <a href="page.php?w=molybdenum">Mo</a><sup>3+</sup>, <a href="page.php?w=rhenium">Re</a><sup>4+</sup>, <a href="page.php?w=osmium">Os</a><sup>4+</sup>, and so on.</p>

<p><big> Physical mechanisms </big></p>
<p>There are three basic mechanisms for photon upconversion in inorganic materials and at least two distinct mechanisms in organic materials. In inorganic materials</p><p>
<a accesskey="1" href="page.php?w=Photon_upconversion&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=Photon_upconversion&amp;p=4">3.Next</a>
</p>

<do type="prev" label="Search">
        <go href="search.wml"/>
</do>

</card>
</wml>
