Electric Field Modulation of Semiconductor Quantum Dot Photoluminescence: Insights Into the Design of Robust Voltage-Sensitive Cellular Imaging Probes
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- 作者：Clare E. Rowland ; Kimihiro Susumu ; Michael H. Stewart ; Eunkeu Oh ; Antti J. M盲kinen ; Thomas J. O鈥橲haughnessy ; Gary Kushto ; Mason A. Wolak ; Jeffrey S. Erickson ; Alexander L. Efros ; Alan L. Huston ; James B. Delehanty
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：October 14, 2015
- 年：2015
- 卷：15
- 期：10
- 页码：6848-6854
- 全文大小：358K
- ISSN：1530-6992
文摘
The intrinsic properties of quantum dots (QDs) and the growing ability to interface them controllably with living cells has far-reaching potential applications in probing cellular processes such as membrane action potential. We demonstrate that an electric field typical of those found in neuronal membranes results in suppression of the QD photoluminescence (PL) and, for the first time, that QD PL is able to track the action potential profile of a firing neuron with millisecond time resolution. This effect is shown to be connected with electric-field-driven QD ionization and consequent QD PL quenching, in contradiction with conventional wisdom that suppression of the QD PL is attributable to the quantum confined Stark effect.