Magnetic Semiconductor EuO, EuS, and EuSe Nanocrystals for Future Optical Devices

Hasegawa, Yasuchika

doi:10.1246/cl.2013.2

Cited by 17 publications

(59 citation statements)

References 81 publications

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“…The coordination ability of solvent molecules can be evaluated by 13 C NMR measurements. The strength of the interaction between the solvent molecules and [Nd(hfa-D) 3 ] estimated by NMR measurement correlated well with the emission intensities in the respective solvents. The strong coordination of DMSO molecules to the Nd(III) ion in [Nd(hfa-D) 3 ] was confirmed by the chemical shift of the DMSO molecule itself observed in the 13 C NMR spectra.…”

Section: ¹1supporting

confidence: 56%

“…The intensity of the band in DMSO-d 6 was ten times larger by about one order of magnitude than that in methanol-d 4 . Emission from [Nd(hfa) 3 ] was not observed in non-deuterated solvents. The emission spectrum had a symmetric shape with a narrow band width.…”

Section: ¹1mentioning

confidence: 94%

“…On the other hand, electronic transition between the 4f and 5d orbitals is allowed by a change of parity. 3 Lanthanoid elements with 4f 7 electrons, Gd(III), Eu(II), and Tb(IV) ions, show allowed 4f5d transition with a short lifetime of the excited state. At present, inorganic phosphors containing Eu(II) have been reported.…”

Section: ¹1mentioning

confidence: 99%

“…This theoretical understanding led to the first successful utilization of deuterated hexafluoroacetylacetone (hfa-D) as an effective ligand, which enables the resulting Nd(III) complex to have luminescence in an organic liquid matrix (Figure 4). 32 A solution of [Nd(hfa-D) 3 ] in acetone-d 6 showed emissions at 880, 1062, and 1345 nm when the system was excited at 585 nm. The quantum yield of the luminescence was determined to be on the order of 10 ¹3 with an integrating sphere.…”

Section: Luminescent Lanthanoid Complex Ii: Suppression Of Vibrationamentioning

confidence: 99%

“…The coordination number of rare earth ions in solution is known to vary from 8 to 10, depending on the nature of the ligating molecules. 3540 [Nd(hfa-D) 3 ] complex was prepared from non-duterated [Nd(hfa-H) 3 The emission intensity due to the 4 F 3/2 ¼ 4 I 11/2 transition depended on the choice of solvent. The intensity of the band in DMSO-d 6 was ten times larger by about one order of magnitude than that in methanol-d 4 .…”

Section: ¹1mentioning

confidence: 99%

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Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Hasegawa

2014

Bulletin of the Chemical Society of Japan

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In this account, lanthanoid complexes, coordination polymers, and nanocrystals with photofunctional properties are introduced. To maintain the effective emission of Nd(III), Sm(III), Eu(III), Tb(III), and Yb(III) ions in organic media, the coordination sphere of the lanthanoid ions should consist of strong, bulky, and asymmetric ligands with low vibrational frequencies, that is, there are three criteria for luminescence: 1) suppression of vibrational relaxation, 2) prevention of nonradiative cross relaxation at diffusional collision, and 3) introduction of asymmetric coordination geometry for enhancing electric dipole transition. Lanthanoid coordination compounds with characteristic photosensitizing properties, photochromic properties, circularly polarized luminescence (CPL), metal ion sensing properties, solvent sensing properties, energy-conversion properties, thermostable properties, triboluminescent properties, and thermosensing properties are also described for the development of photofunctional materials. In the second half, the synthesis, photophysical magnetic, and magneto-optical properties of lanthanoid nanocrystals, EuO, EuS, and EuSe, are reported. In particular, the remarkable photophysical properties of nanoaggregates composed of EuS nanocrystals are presented. Photofunctional lanthanoid(III) complexes, coordination polymers, and nanocrystals are expected to open up a frontier field of materials science.

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Section: ¹1supporting

confidence: 56%

Section: ¹1mentioning

confidence: 94%

Section: ¹1mentioning

confidence: 99%

Section: Luminescent Lanthanoid Complex Ii: Suppression Of Vibrationamentioning

confidence: 99%

Section: ¹1mentioning

confidence: 99%

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Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Hasegawa

2014

Bulletin of the Chemical Society of Japan

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Synthesis and Properties of Magnetic Chalcogenide Nanostructures

Ramasamy

Palchoudhury

Gupta

2017

Magnetic Nanomaterials - Fundamentals, Synthesis and Applications

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Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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2D rare earth (RE) materials have received considerable attention in recent years due to the fascinating luminescence, magnetism, and electric properties originated from RE associated with sharp and various emission peaks, intrinsic 2D ferromagnetism, and incommensurate charge density wave. These materials might open up a new prospect in next‐generation lighting, magnetic devices, and phototransistors. Herein, a comprehensive review of 2D RE materials is presented, focusing on their recent progresses. First, the crystal structures of 2D RE materials are discussed. Then, typical synthesis methods such as mechanical exfoliation, molecular beam epitaxy, pulsed laser deposition, and chemical vapor deposition are introduced. Furthermore, various properties in luminescence, magnetism, and electronics are summarized. The recently reported RE‐based 2D novel photodetectors are outlined as three constructions: MoS2/RE, graphene/RE, and perovskite/RE, which show promising applications for both narrow and broad band detection arised from the special absorption windows of different RE elements. Finally, the conclusions and outlook of this area are proposed, such as exploring novel 2D RE compounds, improving stability, and broadening applications.

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Magnetic Semiconductor EuO, EuS, and EuSe Nanocrystals for Future Optical Devices

Abstract: ). In this review, syntheses and characteristic photophysical properties of EuX nanocrystals are introduced. EuX nanocrystals are expected to be useful in applications such as future optical isolators, optomagnetic and spintronic devices.

Cited by 17 publications

References 81 publications

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Synthesis and Properties of Magnetic Chalcogenide Nanostructures

Recent Advances in 2D Rare Earth Materials

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