Optimum quantum dot size for highly efficient fluorescence bioimaging
Entity
UAM. Departamento de BiologíaPublisher
American Institute of Physics.Date
2012-01-25Citation
10.1063/1.3676251
Journal of Applied Physics 111.2 (2012): 023513
ISSN
0021-8979 (print); 1089-7550 (online)DOI
10.1063/1.3676251Funded by
This work was supported by the Universidad Autónoma de Madrid and Comunidad Autónoma de Madrid (Projects CCG087-UAM/MAT-4434 and 2009/MAT-1756), by the Spanish Ministerio de Educacion y Ciencia (MAT 2010-16161), by a Banco Santander CEAL-UAM project, and by the Brazilian agencies CAPES, CNPq, and FAPEAL (through the PRONEX 2009-09-006).Project
Comunidad de Madrid. S2009/MAT-1756/PHAMAEditor's Version
http://dx.doi.org/10.1063/1.3676251Subjects
Quantum dots; Fluorescence; Medical imaging; Brightness; Semiconductors; Biología y Biomedicina / BiologíaNote
The following article appeared in Journal of Applied Physics 111.2 (2012): 023513 and may be found at http://scitation.aip.org/content/aip/journal/jap/111/2/10.1063/1.3676251Rights
©2012 American Institute of Physics.Abstract
Semiconductor quantum dots of few nanometers have demonstrated a great potential for bioimaging. The size determines the emitted color, but it is also expected to play an important role in the image brightness. In this work, the size dependence of the fluorescence quantum yield of the highly thermal sensitive CdTe quantum dots has been systematically investigated by thermal lens spectroscopy. It has been found that an optimum quantum yield is reached for 3.8-nm quantum dots. The presence of this optimum size has been corroborated in both one-photon excited fluorescence experiments and two-photon fluorescence microscopy of dot-incubated cancer cells. Combination of quantum yield and fluorescence decay time measurements supports that the existence of this optimum size emerges from the interplay between the frequency-dependent radiative emission rate and the size-dependent coupling strength between bulk excitons and surface trapping states.
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Google Scholar:Maestro, Laura Martínez
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Jacinto, Carlos
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Rocha, Uéslen
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Sanz Rodríguez, Francisco
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Juarranz de la Fuente, Ángeles
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Jaque García, Daniel
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Iglesias de la Cruz, María del Carmen
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García Solé, José
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