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<section> <article> <h1>研究發(fā)現(xiàn)：俄歇復(fù)合是LED效率下降的禍?zhǔn)?/h1> <div id="rbhd9pl" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2011-10-19</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="d9vj7xb" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="rjbzpvr" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="pfnbbhv" class="content" id="contentDiv" style="position:relative;"> <div id="v9tj9nz" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;">美國加州大學(xué)圣塔芭芭拉分校(UCSB)的研究團(tuán)隊(duì)宣稱通過第一原理計(jì)算發(fā)現(xiàn)，對于以氮化鉀(GaN)為主的發(fā)光二極管(<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>)，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/俄歇復(fù)合"><em>俄歇復(fù)合</em></a>(Auger recombination)是其<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/效率下降"><em>效率下降</em></a>(<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a> droop)與綠色缺口(green gap)的主要原因，可惜并未同時(shí)提出有效的解決方法。 <P><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a> droop是指在較高電流操作下，發(fā)光二極管的外部量子效率會下降。UCSB的Kris Delaney, Patrick Rink及Chris Van deWalle計(jì)算顯示，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/效率下降"><em>效率下降</em></a>的禍?zhǔn)资?a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/俄歇復(fù)合"><em>俄歇復(fù)合</em></a>，它是一種非輻射式的復(fù)合行為，在2.5eV(對應(yīng)波長為0.5 μm)時(shí)達(dá)到顛峰。這同時(shí)也解釋了“綠色缺口”——即波長從藍(lán)光進(jìn)入綠光波段時(shí)，LED的量子效率會下降的由來。 </P><P>稍早LED制造商Philips Lumileds根據(jù)實(shí)驗(yàn)結(jié)果主張，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/俄歇復(fù)合"><em>俄歇復(fù)合</em></a>是在較高電流下<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/效率下降"><em>效率下降</em></a>的主因，這種非輻射式復(fù)合過程牽涉到三個(gè)載子的交互作用，其中至少包含一個(gè)電子與一個(gè)空穴。UCSB的計(jì)算結(jié)果支持這種說法，而不像其它理論研究團(tuán)隊(duì)認(rèn)為俄歇復(fù)合對于LED droop的影響可以忽略，個(gè)中的差異在于采用不同的氮化物能帶結(jié)構(gòu)：UCSB團(tuán)隊(duì)找到第二條導(dǎo)帶(conduction band)，并納入計(jì)算中。 </P><P>UCSB團(tuán)隊(duì)的氮化鎵能帶結(jié)構(gòu)是利用密度泛函理論(density-functional theory)結(jié)合多體微擾理論(many-body perturbation theory)所計(jì)算得到。接著他們采用蒙特卡洛(Monte Carlo)法，計(jì)算了超過4千萬個(gè)步驟的統(tǒng)計(jì)平均，才得到俄歇復(fù)合速率。 </P><P>隨著LED droop的機(jī)制被發(fā)現(xiàn)，未來的研究方向?qū)⒕劢褂谌コ蚪档投硇獜?fù)合所造成的損失。UCSB團(tuán)隊(duì)在論文中討論了三種降低損失的方法，但都有缺點(diǎn)。其中一個(gè)方法是將氮化鉀長成閃鋅礦(zinc-blende)晶格結(jié)構(gòu)而非一般的纖鋅礦(wurtzite)結(jié)構(gòu)，因?yàn)檫@可以將第二條導(dǎo)帶推到能量較高的位置，但是要長出高質(zhì)量的閃鋅礦結(jié)構(gòu)并非易事。其它作法包括利用應(yīng)力或是改變InGaAlN的比例去調(diào)整能帶結(jié)構(gòu)，不過計(jì)算顯示，這些變化都不會明顯提升LED的表現(xiàn)。</P> </span>  <div 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