Universal emission intermittency in quantum dots, nanorods and nanowires

被引:451
作者
Frantsuzov, Pavel [1 ]
Kuno, Masaru [2 ]
Janko, Boldizsar [1 ,4 ]
Marcus, Rudolph A. [3 ]
机构
[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
[2] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA
[3] CALTECH, Arthur Amos Noyes Lab Chem Phys, Pasadena, CA 91125 USA
[4] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nphys1001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Virtually all known fluorophores exhibit mysterious episodes of emission intermittency. A remarkable feature of the phenomenon is a power-law distribution of on- and off-times observed in colloidal semiconductor quantum dots, nanorods, nanowires and some organic dyes. For nanoparticles, the resulting power law extends over an extraordinarily wide dynamic range: nine orders of magnitude in probability density and five to six orders of magnitude in time. Exponents hover about the ubiquitous value of -3/2. Dark states routinely last for tens of seconds - practically forever on quantum mechanical timescales. Despite such infinite states of darkness, the dots miraculously recover and start emitting again. Although the underlying mechanism responsible for this phenomenon remains a mystery and many questions persist, we argue that substantial theoretical progress has been made.
引用
收藏
页码:519 / 522
页数:4
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