Luminescent properties of CdS nanoclusters dispersed in solution—Effects of size and surface termination

Okamura, Misato; Ebina, Kojiro; Akimoto, Seiji; Yamazaki, Iwao; Uosaki, Kohei

doi:10.1016/j.jphotochem.2005.10.036

Cited by 10 publications

(13 citation statements)

References 43 publications

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“…Experimental data available for CdS particles with diameters of several nanometers are in accord with the quantum confinement model since both the optical absorption and the emission exhibit a shift to higher energies (blue shift) when the particle size decreases. However, the difference between the experimental and theoretical values, computed using the effective mass approximation, increases when the cluster size decreases.…”

Section: Computational Detailsmentioning

confidence: 65%

Evolution of Properties in Prolate (GaAs)_n Clusters

Karamanis¹,

Pouchan²,

Weatherford³

et al. 2010

J. Phys. Chem. C

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The structure and properties of prolate (GaAs) n clusters corresponding to the (2, 2) and (3, 3) armchair and (6, 0) zigzag capped single-wall tubes are studied using density functional theory with generalized gradient approximation (DFT-GGA). The largest number of atoms is 120 in the (2, 2) and (3, 3) series and 116 in the (6, 0) series. It is found that the band gap in all three series does not converge to the GaAs bulk value when the cluster length increases. The (2, 2) species has the smallest gaps, which are nearly 2 times smaller than the GaAs bulk gap at larger n. Cohesive energies per atom are found to be nearly independent of the cluster diameter and correspond to 75−78% of the bulk cohesive energy per atom. Special attention is paid to the static electric dipole polarizability and hyperpolarizability because conventional DFT-GGA methods provide satisfactory results only for clusters composed of less than ∼40 atoms. For larger clusters, conventional DFT polarizabilities and especially hyperpolarizabilities exhibit the divergent behavior. An inclusion of long-range corrections drastically changes this behavior and brings the corrected values close to the values obtained in the MP2 computations with the same basis sets. The CAM-B3LYP method recently devised to account for the long-range corrections was tested as well. Finally, we estimated asymptotic values for the (hyper)polarizabilies per unit length.

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Section: Computational Detailsmentioning

confidence: 65%

Evolution of Properties in Prolate (GaAs)_n Clusters

Karamanis¹,

Pouchan²,

Weatherford³

et al. 2010

J. Phys. Chem. C

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“…26 Actually, We have also observed that the PL intensity decreased significantly by thiol-capping. 30 Recently, Wuister et al investigated the effect of thiol capping on the exciton luminescence of CdTe and CdSe nanoparticles. 31 They found that the thiol-capping treatments resulted in an increase in luminescence for CdTe nanoparticles but quenching of CdSe nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Size-Dependent Carrier Dynamics in CdS Nanoparticles by Femtosecond Visible-Pump/IR-Probe Measurements

et al. 2006

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Ultrafast photoexcited carrier dynamics in CdS nanoparticles prepared by an AOT/n-heptane reversed micelle system were investigated by a femtosecond visible-pump/mid-IR probe technique. A mid-IR probe beam was found to mainly probe the ultrafast dynamics of photoexcited electrons in the conduction band. Dispersions of CdS nanoparticles with 8 different mean diameters from 2.9 to 4.1 nm were prepared by tuning the mole ratio between water and AOT (W ) [H 2 O]/[AOT]) in the reversed micelle systems. The excited state lifetime strongly depended on the mean size of CdS nanoparticles with a maximum around a mean diameter of 3.5 nm. This result was explained by considering the balance between the carrier recombination rates via surface states and those via interior states. The relationship between the excited state lifetime and the size of CdS nanoparticles was drastically changed when the surface was terminated by thiol molecules.

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“…Regulation of the surrounding lattice environment of the Ce 3+ center in LuPO 4 can serve as an effective approach for modifying the scintillation properties of Ce:LuPO 4 . In comparison with the luminescent properties of bulk materials, nanoparticles have demonstrated some novel properties. , Furthermore, the surface condition has also been found to play a dramatic role in the luminescent properties of nanomaterials. − It is notable that the lattice environment at the crystal surface is different from that in the bulk due to modification of the surface-induced chemical bonding architecture near the crystal surface (Figure ). , As the size decreases from bulk to micro- and nanometer, the weight of the Ce 3+ center located at the crystal surface increases remarkably, and the modification of the surface-induced chemical bonding architecture depends on the crystal shape and size.…”

Section: Introductionmentioning

confidence: 99%

Crystallization-Dependent Luminescence Properties of Ce:LuPO₄

Sun

Wang

et al. 2016

Inorg. Chem.

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The luminescence properties of Ce:LuPO4 depend on both the Ce(3+) center and the host lattice. In this article, we studied the dependence of the luminescence properties of Ce:LuPO4 on both the doping concentration of Ce(3+) and the size and morphology of the LuPO4 matrix at micro- and nanosize regimes. The crystalline behavior of Ce:LuPO4, including its size and shape, was investigated via precursor transformation crystallization. On the basis of this crystallization approach, Ce:LuPO4 hollow nanospheres, nanorods, and regular tetrahedrons were obtained. For micro- and nanostructured Ce:LuPO4, the surface-induced chemical bonding architecture can be effectively varied by controlling the size of the crystalline material and its geometry. Our experimental observations demonstrate that one-dimensional Ce:LuPO4 nanorods doped with 0.1 mol % Ce(3+) possess the best performance among the as-prepared samples. The significant anisotropy of Ce:LuPO4 nanorods can result in a larger specific surface area and enhanced luminescence properties. Moreover, the improved luminescence property of Ce:LuPO4 nanostructures can also be optimized by increasing the preferential anisotropic chemical bonding architecture to regulate the 5d level of Ce(3+). Our work also shows that the photoluminescence emission intensity of Ce:LuPO4 nanorods is increased as the surface area normal to their axial direction increases. From the standpoint of crystallization, the luminescence properties of Ce(3+) in nano- and microsize matrixes can be well-optimized by controlling the crystalline behavior of the host lattice under proper synthesis conditions.

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Luminescent properties of CdS nanoclusters dispersed in solution—Effects of size and surface termination

Cited by 10 publications

References 43 publications

Evolution of Properties in Prolate (GaAs)_n Clusters

Evolution of Properties in Prolate (GaAs)_n Clusters

Size-Dependent Carrier Dynamics in CdS Nanoparticles by Femtosecond Visible-Pump/IR-Probe Measurements

Crystallization-Dependent Luminescence Properties of Ce:LuPO₄

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Luminescent properties of CdS nanoclusters dispersed in solution—Effects of size and surface termination

Cited by 10 publications

References 43 publications

Evolution of Properties in Prolate (GaAs)n Clusters

Evolution of Properties in Prolate (GaAs)n Clusters

Size-Dependent Carrier Dynamics in CdS Nanoparticles by Femtosecond Visible-Pump/IR-Probe Measurements

Crystallization-Dependent Luminescence Properties of Ce:LuPO4

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Product

Resources

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Evolution of Properties in Prolate (GaAs)_n Clusters

Evolution of Properties in Prolate (GaAs)_n Clusters

Crystallization-Dependent Luminescence Properties of Ce:LuPO₄