Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3676251
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Funding
- Universidad Autonoma de Madrid
- Comunidad Autonoma de Madrid [CCG087-UAM/MAT-4434, 2009/MAT-1756]
- Spanish Ministerio de Educacion y Ciencia [MAT 2010-16161]
- Banco Santander CEAL-UAM project
- Brazilian agency CAPES
- Brazilian agency CNPq
- Brazilian agency FAPEAL [PRONEX 2009-09-006]
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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. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676251]
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