Optical and magnetooptical study of CdTe crystals doped with rare earth ions

Савчук, A. Й.; Paranchych, S. Yu.; Frasunyak, V. M.; Fediv, V. I.; Tanasyuk, Yu. V.; Kandyba, Ye.O.; Никитин, П. И.

doi:10.1016/j.mseb.2003.08.037

Cited by 13 publications

(7 citation statements)

References 12 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%

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%

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

2020

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“…In this decade, rare-earth-doped QDs have been fascinating major interest because of unique photoluminescence and electroluminescence properties that this doping is the main route to adjust their physical behaviors [38][39][40]. These QDs doped with rare earth elements have presented a high luminescence yield [41]. Rare-earth ions-doped quantum dots, because of both optical and magnetic potential in a single unit is of speci c importance in the eld of bioimaging [42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

et al. 2021

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This research reports the preparation and examination of Cadmium Telluride (CdTe) Quantum Dots and doping CdTe QDs with Europium (Eu), Gadolinium (Gd), and Manganese (Mn) prepared in aqueous solution using TGA as a capping agent. Magnetic QDs (MQDs) are important agents for uorescence (FL) /magnetic resonance (MR) dual-modal imaging due to their excellent optical and magnetic properties.Herein, the chemical bonds, structural, uorescence, and magnetized properties of CdTe QDs and effect of Mn, Eu, and Gd ions doping on their properties were examined by X-ray powder diffraction (XRD), highresolution transmission electron microscopy (HRTM), Energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), photoluminescence spectroscopy (PL), Ultraviolet-visible spectroscopy (UV-Vis), and vibrating sample magnetometer measurements (VSM). Almost similar X-Ray patterns with the absence/presence of ions for all samples with cubic crystal structures were obtained which indicates that the introduction of ions into CdTe QDs could not alteration the cubic primary structure of CdTe. Monodisperse size distribution with seemingly-spherical shapes, and also, the estimated mean diameters about 3 and less than 3 nm of QDs Were obtained. The effect of X ions injection on the uorescence and UV-Vis properties of the QDs were also investigated. Optical studies showed the decreases in bandgap with the heating time increases during synthesis, and they undergo red-shift. The CdTe nanocrystals with high PL quantum yields were achieved in more than 6 h of heating. Also, investigations have shown the quenching of uorescence by the existence of ions in the CdTe QDs.And Also, all the ions doped QDs exhibited ferromagnetic behavior at room temperature by a vibrating sample magnetometer which con rmed the success of the presentation of ions into CdTe cubic crystal structure. They can have been employed as a suitable contrast agent successfully for biological applications such as FL/MR dual-modal imaging.

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“…Although there are reports on dispersion of DMS nanocrystals in the polymer matrix (PVP) [15], however such polymers offer only 30% optical transparency in the optical window 1500-1530 nm [16], compared with close to 99.9% transparency in pure silica. There are reports on thermal annealing and control of size distributions of the DMS Q-dots (ZnMnS [17], PbMn(Te,S) [18] CdMnTe [19] and Mn 2+ -doped Bi 2 S 3 [5,20]) in oxide glass matrices, which form the basis for developing an approach for controlling the thermal annealing condition for Qdot size distribution for Mn 2+ -doped CdS glasses. Techniques of Q-dot structural characterisation for maximizing the Verdet constant using the electron paramagnetic resonance, room temperature and below 4K magnetic susceptibility and AC field-induced magnetisation characterisation have been reported [1,21].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+- doped CdS quantum dots in a silicate glass

Panmand

Tekale

Daware

et al. 2020

Journal of Alloys and Compounds

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Optical and magnetooptical study of CdTe crystals doped with rare earth ions

Cited by 13 publications

References 12 publications

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+- doped CdS quantum dots in a silicate glass

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