The magnetic field effect on optical properties of Sm-doped GaN thin films

Sun, Pan; Li, Yanchen; Meng, Xiuqing; Yu, Sheng; Liu, Yihe; Liu, Fengqi; Wang, Zhanguo

doi:10.1007/s10854-014-1969-0

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…158 This is an important consideration since, as previously discussed, most of the classical binary semiconductors have only tetragonal cation sites and their doping with Ln 3+ was achieved in their bulk form via highenergy/temperature techniques. [159][160][161] However, their nano counterparts often showed poor Ln 3+ sensitized emission 54,98 and the dopant was largely found on the surface of the nanocrystals rather than incorporated in the core. 88,98,162,163 AESs such as CaS and SrS are included in the figure, but often therein Ln 3+ sensitization relies on Ce 3+ -Ln 3+ co-doping.…”

Section: Additional Observations On the Designmentioning

confidence: 99%

“…In the case of α- and β-Ga 2 O 3 , the latter has both tetragonal and octahedral sites, while the former features only octahedral sites . This is an important consideration because, as previously discussed, most of the classical binary semiconductors have only tetragonal cation sites and their doping with Ln 3+ was achieved in their bulk form via high-energy/temperature techniques. − However, their nano counterparts often showed poor Ln 3+ sensitized emission , and the dopant was largely found on the surface of the nanocrystals rather than incorporated in the core. ,,, …”

Section: Designing a Lanthanide-doped Semiconductor Nanocrystalmentioning

confidence: 99%

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Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

2020

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The spectrally narrow, long-lived luminescence of lanthanide ions makes optical nanomaterials based on these elements uniquely attractive from both a fundamental and applicative standpoint. A highly coveted class of such nanomaterials is represented by colloidal lanthanide-doped semiconductor nanocrystals (LnSNCs). Therein, upon proper design, the poor light absorption intrinsically featured by lanthanides is compensated by the semiconductor moiety, which harvests the optical energy and funnel it to the luminescent metal center. Although a great deal of experimental effort has been invested to produce efficient nanomaterials of that sort, relatively modest results have been obtained thus far. As of late, halide perovskite nanocrystals have surged as materials of choice for doping lanthanides, but they have non-negligible shortcomings in terms of chemical stability, toxicity, and light absorption range. The limited gamut of currently available colloidal LnSNCs is unfortunate, given the tremendous technological impact that these nanomaterials could have in fields like biomedicine and optoelectronics. In this Review, we provide an overview of the field of colloidal LnSNCs, while distilling the lessons learnt in terms of material design. The result is a compendium of key aspects to consider when devising and synthesizing this class of nanomaterials, with a keen eye on the foreseeable technological scenarios where they are poised to become front runners.* In their book "Understanding Chemistry", Pimentel and Sprately commented how "Lanthanum has only one important oxidation state in aqueous solution, the +3 state. With few exceptions, this tells the whole boring story about the other 14 Lanthanides". Scheme 1. Aspects discussed in this Review about colloidal Ln 3+ -doped semiconductor nanocrystals (LnSNCs). * In 1798, B. M. Tassaert reported the first coordination compound of cobalt and ammonia without, however, fully understanding the material. Passing through S. M. Jörgensen's chain theory to explain metal complexes, it was only in 1893 that A. Werner finally realized the existence of a principal (oxidation state) and auxiliary (coordination number) for the metal in that "odd" class of complex compounds (as Tassaert first referred to them).* This last statement is only partially true. There are slight changes in the position of the 4f-4f emission lines of Ln 3+ depending on the coordination environment of the ion. The extent of such shifts is of up to a few hundred wavenumbers at most and they occur because of the so-called nephelauxetic effect, where changes in the bond length between Ln 3+ and the surrounding anions result in variation of 4f electronic distribution. * A Lewis acid is a species that accepts lone electron pairs from a donor species (Lewis bases). The less (more) the Lewis acid is polarizable, the harder (softer) its acid character is, according to the hard soft acids bases (HSAB) theory. This acidity can be regarded as a measure of how "thirsty" for electrons a species is.* Preliminary information a...

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Section: Additional Observations On the Designmentioning

confidence: 99%

Section: Designing a Lanthanide-doped Semiconductor Nanocrystalmentioning

confidence: 99%

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

2020

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“…Let us comment that Pan Sun et al [37] have reported optical and magnetic properties of doped wide-band-gap GaN. They have shown that the photoluminescence (PL) intensity increased under an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Rashba effect on linear and nonlinear optical properties of a cylindrical core/shell heterojunction quantum dot

et al. 2022

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Rashba effect may play an important role in the nonlinear optical properties of heterojunction quantum dots. In this work, we have theoretically examined the effects of Rashba spin-orbit interaction on an electron in a cylindrical core/shell quantum dot (CCSQD). The modifications of various properties of cylindrical core/shell quantum dot such as transition energies, dipole transition matrix elements and linear and nonlinear optical properties due to change in Rashba coupling parameter, magnetic field and effective Rydberg energy were studied. We solved the Schrödinger equation using numerical methods and obtained energy eigenvalues as functions of the aforementioned parameters. It was observed that, the magnetic field has a considerable effect on absorption coefficients and refractive index. It was also observed that increasing the magnetic field shifts the resonances towards higher energies. Additionally, increasing in the Rashba coupling coefficient (αR) was found out to result an increase in absorption coefficients and refractive index. Our results demonstrated that, we can manipulate optical properties of cylindrical core/shell quantum dot using an external magnetic field.

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“…It is responding to these challenges by developing alternative semiconductor materials that can overcome the limitations of Si. [1][2][3][4][5] Lowdimensional nanostructures are attractive as a channel in future ultimately scaled transistors since their atomic scale thickness offers efficient electrostatic control, making them immune to short channel effects. 6,7 Graphene was known to have remarkable electrical and mechanical properties, 7 including high carrier mobility high thermal conductance, 8 and excellent stiffness.…”

Section: Introductionmentioning

confidence: 99%

Study of interfacial strain at the α-Al2O3/monolayer MoS2 interface by first principle calculations

Ran

Zhu

et al. 2018

Applied Surface Science

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The magnetic field effect on optical properties of Sm-doped GaN thin films

Cited by 5 publications

References 19 publications

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

Rashba effect on linear and nonlinear optical properties of a cylindrical core/shell heterojunction quantum dot

Study of interfacial strain at the α-Al2O3/monolayer MoS2 interface by first principle calculations

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