Investigation of Co, Ni and Fe Doped II-VI Chalcogenides

Mirov, Sergey

doi:10.21236/ada582962

Cited by 3 publications

(2 citation statements)

References 9 publications

(36 reference statements)

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“…Compared with that of pure ZnSe nanocrystals, an absorption peak near 770 nm is clearly visible for all the Co 2+ -doped ZnSe nanocrystals’ absorption spectra. The absorption spectra of nanocrystals are similar to those of bulk crystal at room temperature . The sphalerite ZnSe crystals belong to the F-43 M lattice, and Co 2+ ions are doped into the lattice and replace the position of Zn 2+ ions.…”

Section: Resultsmentioning

confidence: 71%

“…The absorption spectra of nanocrystals are similar to those of bulk crystal at room temperature. 37 The sphalerite ZnSe crystals belong to the F-43 M lattice, and Co 2+ ions are doped into the lattice and replace the position of Zn 2+ ions. The main transitions of Co 2+ ions in ZnSe occurred between the 4P and 4F levels, and the 4F level in the ground state was split into three energy levels of 4 T 1 , 4 T 2 , and 4 A 2 (as shown in Figure 11).…”

Section: Resultsmentioning

confidence: 99%

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Mid-Infrared Emission of Transition Metal Co²⁺-Doped ZnSe Nanocrystals at Room Temperature via Hydrothermal Preparation

Chen

Cui

Xiao

et al. 2019

ACS Appl. Nano Mater.

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A series of Co 2+ :ZnSe and Co 2+ :ZnSe/ZnSe nanocrystals emitting mid-infrared (mid-IR) fluorescence centered at around 3.4 and 4.7 μm were successfully synthesized via a simple hydrothermal method. The core/shell structure and post-heat treatment under reducing atmosphere were adopted to decrease the nanocrystal's surface quenching centers and defects and improve the mid-IR photoluminescence. By analysis of the X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, Fourier transform IR, absorption, and mid-IR emission measurements of serial concentrations of Co 2+ -doped ZnSe nanocrystals, the crystal phase, grain size, core/shell structure, distribution of Co 2+ ions, impurities on the surface, and mid-IR emission performance were investigated in detail. By use of optimum Co 2+ concentration, core/shell structure construction, and proper post-heat treatment, the mid-IR emission intensities of nanocrystals were enhanced by an order of magnitude, and the nanocrystals showed excellent dispersibility. These high-quality optically active nanomaterials have potential uses in mid-IR devices such as composite fiber amplifiers and hot-pressed ceramic laser materials.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%