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<div class="ss"><div><span>导读： </span>中国科学院大连化学物理研究所研究员吴凯丰、副研究员杨阳团队制备了具有优异光学性能的低毒性蓝光胶体量子点，并以其溶液为光增益介质，实现了高度稳定的液体激光输出。该研究对于推动胶体量子点在激光领域的实际应 ...</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"><p style="margin: 0px; padding: 0px 0px 1em; border: 0px; line-height: 2; text-indent: 2em; font-family: PingFangSC-Regular; font-size: 16px; background-color: rgb(255, 255, 255);">中国科学院大连化学<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>研究所研究员吴凯丰、副研究员杨阳团队制备了具有优异光学性能的低毒性蓝光胶体量子点，并以其溶液为光增益介质，实现了高度稳定的液体<span class="hrefStyle" style="margin: 0px; padding: 0px;"><a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a></span>输出。该研究对于推动胶体量子点在激光领域的实际应用具有重要意义。相关研究成果近日发表于《自然－<a href="http://material.oecr.com" target="_blank" class="relatedlink">纳米</a>技术》。</p><p style="margin: 0px; padding: 0px 0px 1em; border: 0px; line-height: 2; text-indent: 2em; font-family: PingFangSC-Regular; font-size: 16px; background-color: rgb(255, 255, 255);">胶体量子点具有光谱可调谐、<a href="http://light.oecr.com" target="_blank" class="relatedlink">发光</a>纯度高、成本低廉等优点，在激光领域广受关注。研究团队制备了高品质的蓝光ZnSe／ZnS核壳量子点。该量子点尺寸紧凑，具有自发形成的渐变型壳层组分，其“光滑”的限域势阱有助于抑制非辐射俄歇复合，从而延长双激子寿命和增益寿命。随后，团队使用飞秒瞬态吸收光谱研究了该量子点的多激子复合动力学和光增益行为，发现其具有接近1纳秒的双激子光增益寿命。该寿命比相同体积的ZnSe核量子点提升近一个数量级，接近此前报道的20纳米直径的复杂核壳量子点的光增益寿命。</p><p style="margin: 0px; padding: 0px 0px 1em; border: 0px; line-height: 2; text-indent: 2em; font-family: PingFangSC-Regular; font-size: 16px; background-color: rgb(255, 255, 255);">尺寸紧凑、增益寿命长的优点使得该量子点有望在溶液中充当“染料”角色，实现液体激光输出。团队进一步使用<span class="hrefStyle" style="margin: 0px; padding: 0px;">飞秒激光</span>和纳秒激光泵浦量子点溶液，实现了低阈值的蓝光放大自发辐射，并具有较高的增益系数。在纳秒准连续光泵浦下，该量子点溶液在经典的Littrow激光腔中成功实现了激光输出。输出的激光具有阈值低、方向性好、线宽窄、可连续调节、相干性好、偏振度高等特点。该量子点液体激光可以在不搅拌、不循环的条件下实现长时间的稳定输出，比相同波段的蓝光染料分子稳定性高出两个数量级以上。</p><p style="margin: 0px; padding: 0px 0px 1em; border: 0px; line-height: 2; text-indent: 2em; font-family: PingFangSC-Regular; font-size: 16px; background-color: rgb(255, 255, 255);">这项工作充分展示了胶体量子点在液体激光中的实际应用潜力，也为量子点在光流体学、生物成像和诊断等领域的应用提供了新机遇。</p><p microsoft="" yahei",="" simsun;="" background-color:="" rgb(255,="" 255,="" 255);="" text-align:="" center;"="" 255);"="" style="word-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; text-align: center; background-color: rgb(255, 255, 255);"><a href="http://www.oecr.com/data/attachment/portal/202404/12/093958rszee6k8hhykve3w.jpg" target="_blank" style="word-wrap: normal; color: rgb(51, 51, 51); text-decoration: none; transition: all 0.2s linear; font-family: 微软雅黑; text-shadow: 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