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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=115533&size=small" /></div> <h1 class="ph">LED白光技术原理及发展趋势 </h1> <p class="xg1"> 时间：2010-9-28 09:00<a class="zz" href="home.php?mod=space&uid=115533">作者：娆娆</a> 阅读<em id="_viewnum">(2423)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=1158&idtype=aid" title="查看全部评论"><em id="_commentnum">2</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>LED光源从根本上改变了光源发光机理，在提升照明质量和效用的同时，还可以改善环境、节约能源，具有很高的经济效益。目前，白光LED光源正在各个领域慢慢吞噬传统光源的市场。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"> <a href="http://light.oecr.com" target="_blank" class="relatedlink">照明</a>，从始至终与人类文明休戚相关。<br><br> 1879年，爱迪生发明了白炽灯，把人类从火焰照明的时代带到了电光源的时代。一个多世纪以来，电光源照明技术得到了跨越式的发展，先后经历了以白炽灯、荧光灯和高强度气体放电灯(HID)为代表的三个重要阶段。如今，随着新一代<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">半导体</a><a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>的出现和<a href="http://light.oecr.com" target="_blank" class="relatedlink">发光</a>二极管(LED)封装技术的突破，以及LED功率等级的不断提高，LED光源正在掀起电光源发展的第四场革命。<br><br> LED光源从根本上改变了光源发光机理，在提升照明质量和效用的同时，还可以改善环境、节约能源，具有很高的经济效益。目前，白光LED光源正在各个领域慢慢吞噬传统光源的市场。它的应用领域主要有：局部范围低照度照明、液晶(LCD)<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>的背光源、交通照明、室内照明及特殊照明等。据东芝公司(Toshiba)预测，在特殊照明市场，2010年将有16%被LED取代，2012年将达到30%。<br><br> 但从目前的情况来看，固体照明的主要应用还是在彩色LED照明领域。而作为LED业界的最终目标，大功率高亮度白光LED在如今的市场上并没有达到通过机理分析所预期的卓越性能，且价格相对高昂。<br><br> 技术原理<br><br> 要了解白光LED的进步空间，让我们首先补充一点LED的原理。<br><br> LED是由Ⅲ-Ⅴ族化合物，如砷化镓(GaAs)、磷砷化镓(GaAsP)等半导体制成，其核心是电致发光的P-N结。P-N结的一层带过量的<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>，另一层因缺乏电子而形成带正电的“空穴”(载流子)，当在P-N两端施加电压的作用下，电子和“空穴”相互结合并以光子的形式释放出能量，若光子的能量在可见光范围内，从而辐射出光芒。LED的发光波长是由半导体材料的禁带宽度决定的，不同材料的禁带宽度不同，产生的光的波长也不相同，从而，所呈现的颜色也不相同。因此可用不同材料做成不同颜色的LED，如红色、绿色、蓝色等。</td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> 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