论文标题
超高绿色和红色光学增益横截面来自胶体量子井异质结构的溶液
Ultrahigh Green and Red Optical Gain Cross-sections from Solutions of Colloidal Quantum Well Heterostructures
论文作者
论文摘要
溶液中的光学增益，由于增益介质的连续再生提供了高光稳定性，对光电应用非常有吸引力。在这里，我们提出并证明了在溶液中的扩增自发发射（ASE），具有30 mikroj/cm2的红色和44个Mikroj/cm2的超低阈值，以及工程胶体量子井（CQW）异质结构的绿色中的44 mikroj/cm2。为此，旨在击中绿色区域的CDSE/CDS CORE/CROWN CQW以及CDSE/CDS/CDXZN1-XS CORE/CORCE/CROWN/gradient-Alloyed Shell CQWS通过壳合金进行了进一步调整，以在可见的可见度中实现高性能的ASE。这些CQW的净模态增益达到绿色的530 cm-1和红色的201 cm-1，由于这些CQW的本质上较大的增益横截面，在溶液中，溶液中的两个数量级大于胶体量子点（QD）。为了解释溶液中超高增益系数的根本原因，我们表明，与CQD相比，这些CQWS的增益横截面为3.3x10-14 cm2，红色为1.3x10-14 cm2，这是两个级数大的幅度。这些发现证实了这些解决方案处理的CQW作为基于溶液的光学增益媒体的非凡前景。
Optical gain in solution, which provides high photostability as a result of continuous regeneration of the gain medium, is extremely attractive for optoelectronic applications. Here, we propose and demonstrate amplified spontaneous emission (ASE) in solution with ultralow thresholds of 30 mikroJ/cm2 in red and of 44 mikroJ/cm2 in green from engineered colloidal quantum well (CQW) heterostructures. For this purpose, CdSe/CdS core/crown CQWs, designed to hit the green region, and CdSe/CdS/CdxZn1-xS core/crown/gradient-alloyed shell CQWs, further tuned to reach the red region by shell alloying, were employed to achieve high-performance ASE in the visible. The net modal gain of these CQWs reaches 530 cm-1 for the green and 201 cm-1 for the red, two orders of magnitude larger than those of colloidal quantum dots (QDs) in solution owing to intrinsically larger gain cross-sections of these CQWs. To explain the root cause for ultrahigh gain coefficient in solution, we show that for the first time that the gain cross-sections of these CQWs is 3.3x10-14 cm2 in the green and 1.3x10-14 cm2 in the red which are two orders magnitude larger compared to those of CQDs. These findings confirm the extraordinary prospects of these solution-processed CQWs as solution-based optical gain media in lasing applications.
