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<div class="ss"><div><span>导读： </span>现在又到了为大家分享光电技术知识的时候了。引起LED封装失效的主要因素是什么？目前研究的最为深入和广泛的是温度对LED封装可靠性的影响。</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"><div><span style="line-height: 25.2px;"> 现在又到了为大家分享光电技术知识的时候了。</span>引起LED封装失效的主要因素是什么？<span style="line-height: 1.8em;">目前研究的最为深入和广泛的是温度对LED封装可靠性的影响。温度使LED模块及系统失效的原因在于以下几个方面：</span></div><div><span style="line-height: 1.8em;"><br></span></div><div><p style="text-align: center;"><a href="data/attachment/portal/201610/24/111931sss6hnh8u2ssy12s.png" target="_blank"><img src="data/attachment/portal/201610/24/111931sss6hnh8u2ssy12s.png"></a></p><p style="text-align: center;"><br></p></div><div> （1）高温会使封装<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>性能下降<span style="line-height: 25.2px;">，</span><span style="line-height: 25.2px;">降解加快</span><span style="line-height: 1.8em;">；</span></div><div><br></div><div> （2）<span style="line-height: 25.2px;">由于封装材料之间热传导系数的不匹配，温度梯度和温度分布的不均匀，材料内部可能产生裂纹或者在材料之间界面产生脱层。这些裂纹及脱层都会引起光效下降，芯片、荧光粉层之间的脱层可使取光效率下降，荧光粉层与灌封硅胶之间的脱层最高可使取光效率下降20%以上。硅胶与基板之间的脱层甚至有可能导致金线断裂，造成灾难性失效。</span></div><div><span style="line-height: 1.8em;"><br></span></div><div><span style="line-height: 1.8em;"> （3）</span><span style="line-height: 25.2px;">结温对LED的性能会产生很大的影响。过高的结温会使荧光粉层烧黑碳化，使得LED光效急剧降低或造成灾难性失效。另外，由于硅胶和荧光粉颗粒之间的折射率和热膨胀系数不匹配，过高的温度会使荧光粉的转换效率下降，并且掺的荧光粉比例越高，光效下降的越厉害；</span></div><div> </div><div> 通过有关高湿环境实验研究发现，湿气的侵入不但使得LED光效下降，而且有可能导致LED的灾难性失效。通过85℃/ 85%RH高温高湿可靠性加速实验研究发现，湿气在分层缺陷的形成中起着重要的作用，分层现象的产生使得LED的光效下降，不同芯片表面粗糙不同导致了不同的失效模式。LED<a href="http://light.oecr.com" target="_blank" class="relatedlink">照明</a>和背光灯技术在近十几年已经取得了显著的进步，作为公认的新型下一代绿色光源，LED光源已出现在传统照明等领域，但LED光源尚存在很多没有解决的问题。相信随着技术的不断进步，这些问题应该会得到一定的解决。</div><div><br></div><div><p style="text-align: 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name="comment_anchor_8886"></a> <dl id="comment_8886_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8886, '4941');">引用</a> </span> <a href="http://club.oecr.com/space-uid-32148.html" class="xi2 xw1" c="1">xyhjojoy</a> <span class="xg1 xw0">2016-10-25 07:56</span> </dt> <dd>不错 支持一个了</dd> </dl><a name="comment_anchor_8885"></a> <dl id="comment_8885_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8885, '4941');">引用</a> </span> <a href="http://club.oecr.com/space-uid-32126.html" class="xi2 xw1" c="1">benkoyang</a> <span class="xg1 xw0">2016-10-25 07:26</span> </dt> <dd>顶下，挺好的。</dd> </dl><a name="comment_anchor_8874"></a> <dl id="comment_8874_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8874, '4941');">引用</a> </span> <a 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