Disentangling the effects of clustering and multi-exciton emission in second-order photon correlation experiments
Disentangling the effects of clustering and multi-exciton emission in second-order photon correlation experiments
复制标题
DOI：
10.1364/oe.21.007419
复制
发表时间：
2013-03-25
期刊：
影响因子：
3.8
通讯作者：
Htoon, Han
中科院分区：
文献类型：
--
作者：
Mangum, Benjamin D.;Ghosh, Yagnaseni;Htoon, Han
在单粒子光谱学中，在二阶互相关实验中观察到的荧光反聚束的程度指示其双激子量子产率以及粒子是否被很好地隔离。量子点合成的进展已经产生了双激子量子产率接近1的单粒子。因此，这就产生了关于粒子是否具有高双激子量子产率或者它是否作为团簇存在的不确定性。我们报告的时间门控反聚束技术能够确定多激子发射和集群效应的相对贡献。通过这种方式，我们现在可以明确地确定一个粒子是否是单个的。此外，这种时间门控反聚束方法提供了一种精确的方法来确定双激子的寿命与最小的贡献，从高阶多激子状态。(c)2013年美国光学学会
In single particle spectroscopy, the degree of observed fluorescence anti-bunching in a second-order cross correlation experiment is indicative of its bi-exciton quantum yield and whether or not a particle is well isolated. Advances in quantum dot synthesis have produced single particles with bi-exciton quantum yields approaching unity. Consequently, this creates uncertainty as to whether a particle has a high bi-exciton quantum yield or if it exists as a cluster. We report on a time-gated anti-bunching technique capable of determining the relative contributions of both multi-exciton emission and clustering effects. In this way, we can now unambiguously determine if a particle is single. Additionally, this time-gated anti-bunching approach provides an accurate way for the determination of bi-exciton lifetime with minimal contribution from higher order multi-exciton states. (c) 2013 Optical Society of America