The optical spectra characterization of Cr2+:ZnSe polycrystalline synthesized by direct reaction of Zn–Cr alloy and element Se

A Review of Cr2+ or Fe2+ Ion-Doped Zinc Sulfide and Zinc Selenide Ceramics as IR Laser Active Media

“…Second, the presence of impurities can increase the non-radiative transition probabilities, reducing the luminescence quantum yield, rais ing the lasing threshold, or making it impossible to achieve population inversion at all Therefore, laser ceramics should have both high structural perfection and chemical purity preferably 99.99% or better; in particular, limited impurities that have electronic transi tions in the laser wavelength range should be at the ppm level or less. To create a laser material, ZnSe or ZnS particles are doped with iron or chromium The introduction of these metals is possible by solid phase diffusion into prepared zinc chalcogenide powders [80,101,105,110] as well as during synthesis [79,80,88,89,111,112] In [57], a powder for subsequent consolidation was obtained by mechanical grinding in an agate mortar of pure ZnSe with a ZnSe-CrSe mixture of different concentrations (0.01 0.03, 0.05, and 0.1 mol%). The particle size did not exceed 10 µm.…”

“…Despite a fivefold increase in pressing pressure compared to the technique of [57], pores and inclusions were found in the Cr 2+ :ZnSe ceramics; the quality of the material did not allow laser generation To create a laser material, ZnSe or ZnS particles are doped with iron or chromium. The introduction of these metals is possible by solid phase diffusion into prepared zinc chalcogenide powders [80,101,105,110] as well as during synthesis [79,80,88,89,111,112]. In [57], a powder for subsequent consolidation was obtained by mechanical grinding in an agate mortar of pure ZnSe with a ZnSe-CrSe mixture of different concentrations (0.01, 0.03, 0.05, and 0.1 mol%).…”

Innovative solvent-free compound-direct synthesis of defect-rich ultra-thin NiS nanosheets for high-performance supercapacitors

“…11 Then, the direct reaction between elements was used for the preparation of energy storage and conversion materials. 12,13 To facilitate the control of the microstructure and uniformity of the target materials, this strategy is mainly based on the vertical in situ growth of the sheet substrate to obtain thin film materials, which is more suitable for the gassolid reaction. 14 Under its inspiration, the sulfur sources that can be vaporized or decomposed into sulfur-containing gases are an ideal choice.…”

Size Effect of Electrical and Optical Properties in Cr2+:ZnSe Nanowires

“…TM-doped II–VI compounds stand out among other laser crystals as they have a wide bandgap and possess several important features [ 3 ]. Cr 2+ :ZnSe attracts attention due to its outstanding properties, such as low optical phonon cutoff, large absorption and emission cross-section, and high quantum efficiency [ 4 ]. After recent decades of development, continuous (CW) and pulsed laser technologies based on Cr 2+ :ZnSe have matured [ 5 , 6 , 7 , 8 , 9 , 10 ], and entered practical applications [ 11 ].…”