Erratum: Probabilities for dopant pair-state formation in a nanocrystal: Simulations and theory [Phys. Rev. B<b>64</b>, 235408 (2001)]

Suyver, J. F.; Meester, R.; Kelly, J. J.; Meijerink, A.

doi:10.1103/physrevb.66.079901

Cited by 11 publications

(13 citation statements)

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“…This reason explains the significant increases in the overall luminescence intensities of these bands with an increase in the crystal size. It was reported [106] that the probability that a dopant pairstate is formed depends on the particle size. The contributions of the ions at the surface sites play an important role as the size decreases.…”

Section: à2mentioning

confidence: 99%

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

2014

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The fundamental understanding of lanthanide-doped upconverted nanocrystals remains a frontier area of research because of potential applications in photonics and biophotonics. Recent studies have revealed that upconversion luminescence dynamics depend on host crystal structure, size of the nanocrystals, dopant concentration, and core-shell structures, which influence site symmetry and the distribution and energy migration of the dopant ions. In this review, we bring to light the influences of doping/co-doping concentration, crystal phase, crystal size of the host, and core-shell structure on the efficiency of upconversion emission. Furthermore, the lattice strain, due to a change in the crystal phase and by the core-shell structure, strongly influences the upconversion emission intensity. Analysis suggests that the local environment of the ion plays the most significant role in modification of radiative and nonradiative relaxation mechanisms of overall upconversion emission properties. Finally, an outlook on the prospects of this research field is given.

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Section: à2mentioning

confidence: 99%

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

2014

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“…Thus, the estimations presented show that the ordered stage observed in the experiments and the part of doped ions quenched in this stage can not be explained by the uniform distribution of doped ions in the nanocrystal, even with the correction caused by the feature of ion pairs formation in nanoparticles [29]. The appearance of the ordered stage in the 1 D 2 luminescence decay curves at the relatively low Pr concentration (Fig.…”

Section: Resultsmentioning

confidence: 87%

“…The decrease of the nanocrystal size causes the essential increase in the part of ions that has a neighbour in the nearest surrounding due to the increase of the part of doped ions located in the near-surface layer. Taking into account the data obtained in [29], it has been revealed that in Y 2 SiO 5 :Pr 3+ nanocrystals of 20 nm average size, the number of Pr(I) ions which have a neighbour increases by 12% as compared to that for bulk crystals.…”

Section: Resultsmentioning

confidence: 94%

“…However, owing to the increasing role of the surface in nanocrystals, the part of doped ions that has a neighbour in the nearest surrounding can increase due to the feature of site population available in nearsurface layer [29]. The decrease of the nanocrystal size causes the essential increase in the part of ions that has a neighbour in the nearest surrounding due to the increase of the part of doped ions located in the near-surface layer.…”

Section: Resultsmentioning

confidence: 98%

“…For the first estimation, the random distribution of doped ions within the nanocrystal volume will be accepted. And then we will calculate the rate of Pr 3+ pairs taking into account the feature of the pair formation for small nanoparticles [29]. For both considerations we have to know how many Pr(I) and Pr(II) optical centers surround the Pr(I) optical centre.…”

Section: Resultsmentioning

confidence: 99%

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Strong quenching of Y₂SiO₅:Pr³⁺ nanocrystal luminescence by praseodymium nonuniform distribution

Zhmurin

Znamenskii

Yukina

et al. 2007

Physica Status Solidi (b)

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crystals has revealed that the concentration threshold of luminescence quenching is strikingly low for nanocrystals. In this case the ordered stage in the 1 D 2 luminescence decay has been observed at anomalously low Pr concentration (0.5 at%). This effect is caused by the preferred Pr accumulation at the nanocrystal periphery that provides the relaxation of elastic tension arising due to the difference of ionic radii of Pr 3+ and Y 3+. The temporal behavior of the 1 D 2 luminescence decay in the disordered stage shows that the concentration quenching is caused by the cooperative cross-relaxation.

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Defect‐Mediated Photoluminescence Dynamics of Eu³⁺‐Doped TiO₂ Nanocrystals Revealed at the Single‐Particle or Single‐Aggregate Level

Tachikawa

Ishigaki

et al. 2008

Angewandte Chemie

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Lanthanide-doped materials are finding use in a wide variety of applications in optics as gain media for amplifiers and lasers and as biolabels, white-light emitters, and full-color phosphors for displays. [1, 2] Since direct excitation of the parity-forbidden intra-f-shell lanthanide ion crystal-field transitions is inefficient, it is anticipated that the luminescence of lanthanide ions incorporated in a wide-band-gap semiconductor lattice (e.g., ZnO and TiO 2 ) could be sensitized efficiently by exciton recombination in the host (Figure 1) 3+ ions increases at first but then decreases and reaches a maximum at an annealing temperature of 700 8C.[2c] In this respect, the luminescence of Eu 3+ depends critically on the locations of dopants in the host. However, the mechanism of the energy-transfer process from the defect energy levels of the host to dopants has not yet been clarified owing to several difficulties, such as the inhomogeneous distribution of ions in the material. Single-molecule (single-particle) fluorescence spectroscopy has already yielded new insight into the photophysics and photochemistry of inorganic and organic nanocrystals. [3] There are, however, only a few reports on the PL behavior of lanthanide-doped materials.[4] We have now investigated the PL dynamics of undoped TiO 2 and TiO 2 :Eu 3+ (0.5 atom %) nanoparticles (or their aggregates) using single-particle PL spectroscopy. Photostimulated formation of emissive defects at the TiO 2 surface and defect-mediated PL of the doped Eu 3+ were examined at the single-particle or single-aggregate level.Undoped TiO 2 and TiO 2 :Eu 3+ powders were synthesized by radio-frequency Ar/O 2 thermal-plasma oxidation of mists of liquid precursors containing titanium tetra-n-butoxide and europium nitrate. Detailed synthetic procedures and characterization of particles (UV/Vis absorption and excitation spectra, XRD, TEM, and AFM) are given in reference [2d] and the Supporting Information.The PL images and spectra of individual luminescent spots were measured during 405-nm laser excitation of TiO 2 :Eu 3+ nanoparticles in ambient air. As shown in Figure 2 A, a number of spots with various intensities were observed (left image).Figure 2 B shows typical PL spectra of individual luminescent spots below the diffraction limit of about 150 nm for TiO 2 :Eu 3+ nanoparticles in ambient air (the AFM image is given in the Supporting Information, Figure S1). Singleparticle spectral measurements revealed that the PL bands around 590 and 615 nm are attributable to transitions from the 5 D 0 level to the 7 F 1 and 7 F 2 levels of Eu 3+ , respectively. [1, 2] Since the 5 D 0 ! 7 F 2 transition is electrically allowed, it is very sensitive to the surroundings of the Eu 3+ ion, whereas the

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Erratum: Probabilities for dopant pair-state formation in a nanocrystal: Simulations and theory [Phys. Rev. B64, 235408 (2001)]

Cited by 11 publications

References 0 publications

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Strong quenching of Y₂SiO₅:Pr³⁺ nanocrystal luminescence by praseodymium nonuniform distribution

Defect‐Mediated Photoluminescence Dynamics of Eu³⁺‐Doped TiO₂ Nanocrystals Revealed at the Single‐Particle or Single‐Aggregate Level

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Erratum: Probabilities for dopant pair-state formation in a nanocrystal: Simulations and theory [Phys. Rev. B64, 235408 (2001)]

Cited by 11 publications

References 0 publications

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Strong quenching of Y2SiO5:Pr3+ nanocrystal luminescence by praseodymium nonuniform distribution

Defect‐Mediated Photoluminescence Dynamics of Eu3+‐Doped TiO2 Nanocrystals Revealed at the Single‐Particle or Single‐Aggregate Level

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Strong quenching of Y₂SiO₅:Pr³⁺ nanocrystal luminescence by praseodymium nonuniform distribution

Defect‐Mediated Photoluminescence Dynamics of Eu³⁺‐Doped TiO₂ Nanocrystals Revealed at the Single‐Particle or Single‐Aggregate Level