Enhancement of emission from CdSe quantum dots induced by propagating surface plasmon polaritons

Abstract

The influence on the emission property of CdSe quantum dots arising from propagating surface plasmon polaritons based on interconnected periodic gold nanoarrays with a large area of 1 cm2 is reported. Variation in the structural parameters allows us to tune the surface plasmon resonance to the emission band of quantum dots, which can result in an enhancement up to 54 times in the external quantum efficiency. Our strategy for the enhancement of luminescence efficiency from semiconductor quantum dots should be useful for the creation of high efficiency solid state emitters.

The double-effect mechanism between Fe3O4 nanoparticles and MSA-capped CdTe QDs

“…From Table 1, it can be seen that when the distance between Fe 3 O 4 nanoparticles and QDs was lower than about 21 nm (n ¼3 (PDDA/PSS) 3 PDDA, which means that there are seven films between QDs and Fe 3 O 4 , and one film of polymer was estimated to be about 3 nm in general [27]), fluorescence enhancement can be observed obviously, and when the distance between Fe 3 O 4 nanoparticles and QDs is increased to about 27 nm (n¼4), fluorescence quenching occurred. The result shows that the maximum distance of fluorescence enhancement effect is about 21 nm, which further confirms that the fluorescence enhancement effect was not caused by energy transfer because the effect of energy transfer occurred below the distance of 10 nm [25,26]. So the second possibility can also be ruled out.…”

“…The third possibility, the coupling of the fluorophore with the plasmon resonance of a metal nanoparticle, was reported by numerous literatures for fluorescence enhancement [17,26,28], but it was also impossible because the localized surface plasma effect only occurred in the noble metals, and has not been reported for Fe 3 O 4 nanoparticles. This effect has been explained by the coupling of surface plasmon resonances from metal nanoparticles with the fluorophores, resulting in an increase in the excitation and emission rates of the fluorophore in the localized electromagnetic field and the intrinsic decay rate of the fluorophore with changing the quantum yield and life time of the fluorophore [29].…”

“…There are three possible explanations for fluorescence enhancement according to previous reported texts: first, the fluorescence enhancement could be caused by the surface passivating action on the QD surface or the pH-dependent effect on mercaptoacid-capped CdTe [23]; second, the fluorescence enhancement could be caused by energy transfer [24]; and third, the fluorescence enhancement could be supposed to occur due to a coupling of the fluorophore with the plasmon resonance of a metal nanoparticle [25,26].…”

“…This in turn leads to higher fluorescence intensity. Although the fluorescence enhancement can also be caused by the localized electromagnetic field of noble metal nanoparticles like Au or Ag [17,26,28], the localized electromagnetic field in this mechanism is quite different from the localized electromagnetic field caused by plasmon resonances effect; it is based on the movement of electrons caused by the absorption of exciting light.…”

Plasmon assisted single photon emission of CdSe/CdS nanocrystals deposited on random gold film

“…5,6 Recent advances in plasmonics have also opened the opportunity to use metallic nanostructures. [7][8][9][10][11][12][13] In this paper, we investigate the modification of NCs fluorescence due to the coupling to plasmon modes of a gold random nanostructure. We first show that strong reduction in the excited state lifetime can be obtained in the single photon emission regime.…”