Temporal behavior of biexciton luminescence under two-photon excitation in CuCl quantum dots

Kagotani, Y.; Miyajima, Kensuke; Saito, Shingo; Ashida, Masaaki; Itoh, Tadashi

doi:10.1016/j.jlumin.2005.12.008

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Now there is a third type of phosphor -undoped semiconductor nanocrystals (NCs). 2,3) There has been much fundamental research on undoped NCs, [4][5][6] and there has been initial application to fluorescent probes in biological systems. 7) Since they are very bright and show reasonable photostability together with wavelengthtunability with size, they are applicable to lighting and display as well.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor

Murase¹,

Li²,

Yang³

et al. 2007

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A method was developed to compare the brightness of newly developed thin films with dispersed photoluminescent CdTe semiconductor nanocrystals (NCs) at an ultimately high concentration (ca. 0.01 M) with that of a typical commercial rareearth phosphor (Y 2 O 2 S:Eu). We have found it is reasonable to compare their brightness under conditions of the same sample thickness, excitation intensity, and wavelength. At the weak-excitation limit, the brightness of the new films was about 30 times higher. This higher brightness is due to the higher concentration and emission efficiency of NCs, and the larger absorption cross section per unit volume of NCs. The difference in the brightness increases with the excitation intensity because rare-earth phosphors exhibit a strong saturation phenomenon due to their long emission decay time. Because these films are efficiently excited by UV-blue diodes, the power of which is steadily increasing, they will become more applicable in future.

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Section: Introductionmentioning

confidence: 99%

Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor

Murase¹,

Li²,

Yang³

et al. 2007

jjap

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“…For example, an entanglement of electrons has been optically observed in a pair of coupled QDs, i.e., QD-molecule, which is embedded in the semiconductor layer structure, and this system is expected to be used for quantum information processing [1]. Another example shows the superradiance of biexcitons in CuCl QDs buried in NaCl matrix due to the coherent interaction between QDs via radiation, where their decay becomes faster with increasing the excitation laser intensity [2] and this mechanism could be used in optical devices with variable switching time. In addition, it has been investigated the energy-transfer between CdSe QDs assemblies on the glass substrate, and it is suggested that the rate of the energy flow into large QDs from small QDs can be controlled by sizes of QDs and distance between QDs [3].…”

Section: Introductionmentioning

confidence: 99%

Collective effects in radiation force on movable quantum dots

Iida

Ishihara

2006

Physica Status Solidi (b)

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We theoretically study the resonant radiation force (RF) exerted on interacting quantum dots (QDs). For this purpose, the analytical expression of RF is derived based on the nonlocal theory and the Lorentz force equation. This explicitly shows how RF on QDs behaves under optical excitation of photomediated coupled-states of polaritons in respective QDs confining excitons. In particular, if three QDs are aligned perpendicular to the optical axis, the negative dissipative (scattering and absorbing) force, whose direction is opposite to the light propagation direction, is exerted on the middle QD due to the phase inversion of the induced polarization in it. Furthermore, indirect attractive and repulsive forces arise between QDs at both ends via the middle QD. These effects would enable us to control the spatial dynamics of a QD-assembly by exciting their collective modes.

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“…Such a long range coupling of multiple QDs is expected to be used for scalable quantum information devices. Moreover, there are experimental results indicating that the radiative decay time of CuCl QDs in NaCl matrix becomes faster with an increase in the excitation laser intensity due to the coherent interaction between QDs via radiation, i.e., the superradiance phenomenon [3]. This mechanism would be used for optical switches with variable response time.…”

mentioning

confidence: 99%

Theory of light‐induced force microscopy to observe collective excited states in quantum‐dot‐array

Iida

Ishihara

2009

Phys. Status Solidi (c)

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We theoretically clarify the possibilities to observe the quantum properties of collective excited states in a QD‐array by a new type of scanning force microscopy based on light‐induced force (LIF). It has been clarified that eigenenergies of an electromagnetically coupled QD‐array can be determined through the photon energy spectra of LIF on a probe‐tip. When a collective excited state is selectively excited, the attractive or repulsive LIF is exerted on a probe above particular QDs reflecting the various spatial pattern of excited collective mode of QDs. Obtained results indicate the potential of the LIF microscopy for the direct observation of the spatial structures of quantum states in coherently coupled QDs. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Temporal behavior of biexciton luminescence under two-photon excitation in CuCl quantum dots

Cited by 5 publications

References 12 publications

Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor

Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor

Collective effects in radiation force on movable quantum dots

Theory of light‐induced force microscopy to observe collective excited states in quantum‐dot‐array

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