Semiconductor quantum dot super-emitters: spontaneous emission enhancement combined with suppression of defect environment using metal-oxide plasmonic metafilms
Semiconductor quantum dot super-emitters: spontaneous emission enhancement combined with suppression of defect environment using metal-oxide plasmonic metafilms
复制标题
半导体量子点超级发射器：自发发射增强与使用金属氧化物等离子体超薄膜抑制缺陷环境相结合
DOI：
10.1088/1361-6528/aa9a1c
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发表时间：
2018
期刊：
影响因子：
3.5
通讯作者：
C. Sharp
中科院分区：
文献类型：
--
作者：
S. M. Sadeghi;Waylin J Wing;Rithvik R. Gutha;C. Sharp
我们证明了由薄金层附近的Si/Al氧化物结组成的金属氧化物等离子体元膜可以隔离胶体半导体量子点中的激子，使其免受缺陷环境的影响。当金层的等离子体激元场增强量子点的自发发射衰减速率时，该过程发生。我们研究了当硅铝氧化物结与金薄层之间的距离变化时，这种量子点的发射动力学。结果表明，当距离小于临界值时，量子点的寿命可以被延长，同时它们经历强烈的等离子体激元场。这表明金属氧化物超薄膜可以将光激发的电子保持在量子点的核心中，抑制它们迁移到表面缺陷位置。这导致俄歇复合的抑制，从而提供具有不仅通过等离子体场（珀塞尔效应）而且通过对由缺陷位点引起的非辐射衰减的强抑制而增强的发射的量子点超发射体。
We demonstrate that a metal-oxide plasmonic metafilm consisting of a Si/Al oxide junction in the vicinity of a thin gold layer can quarantine excitons in colloidal semiconductor quantum dots against their defect environments. This process happens while the plasmon fields of the gold layer enhance spontaneous emission decay rates of the quantum dots. We study the emission dynamics of such quantum dots when the distance between the Si/Al oxide junction and the gold thin layer is varied. The results show that for distances less than a critical value the lifetime of the quantum dots can be elongated while they experience intense plasmon fields. This suggests that the metal-oxide metafilm can keep photo-excited electrons in the cores of the quantum dots, suppressing their migration to the surface defect sites. This leads to suppression of Auger recombination, offering quantum dot super-emitters with emission that is enhanced not only by the plasmon fields (Purcell effect), but also by strong suppression of the non-radiative decay caused by the defect sites.
使用金属氧化物光活性基底探测胶体量子点光诱导特性的结构依赖性。
影响因子：
3.2
作者：
Patty,Kira;Sadeghi,SeyedM;Campbell,Quinn;Hamilton,Nathan;West,RobertG;Mao,Chuanbin
通讯作者：
Mao,Chuanbin
DOI：
10.1021/jp405651b
发表时间：
2013-08-20
期刊：
The journal of physical chemistry. C, Nanomaterials and interfaces
影响因子：
--
作者：
Sadeghi SM;Hood B;Patty KD;Mao CB
通讯作者：
Mao CB
影响因子：
3.8
作者：
Zhang, Jian;Lakowicz, Joseph R.
通讯作者：
Lakowicz, Joseph R.