ZnS Mn Research Articles

Synthesis and alloying of zinc sulfide in a homogeneous system based on dodecane, its identification and optical properties

Zinc sulfide doped with Mn2+ ions was synthesized in a homogeneous dodecane medium by the method of emerging reagents. By methods of chemical and X-ray phase analysis, IR spectroscopy, electron microprobe microscopy, identification of products was carried out, photographs of the surface of powder particles (SEM) were recorded. Based on the totality of the results, a conclusion is made about the formation of nanoscale objects having a polytype structure with a predominance of distorted cubic crystals forming agglomerates up to 10 microns in size in ZnS powder and up to 100 microns in ZnS–Mn powder. The formation of nanoscale ZnS particles is confirmed by spectral data. The effect of manganese ions on the photoluminescence (FL) of the powder is manifested by a change in the type of the descending branch of the ZnS–Mn FL band, it is associated with recombination processes at the levels of defects formed by Mn2+ ions in the ZnS structure at their low concentration.

Luminescent Properties of the Surface of ZnS–Mn Nanocrystals Obtained by Self-Propagating High-Temperature Synthesis

Luminescent Properties of the Surface of ZnS–Mn Nanocrystals Obtained by Self-Propagating High-Temperature Synthesis

Synthesis of ZnS–Mn nano-luminescent pigment for ink applications

In the present study, ZnS–Mn nano-luminescent pigments were synthesized, using co-precipitation method. Polyvinylpyrrolidine (PVP) surface modifier and Mn dopant concentrations were considered as affecting parameters. The luminescent ink was loaded with two different concentrations of pigments. The obtained ink was silk-screened on different types of fabrics mainly treated cotton, cotton and nylon. Structure, microstructure, luminescent properties of nano-pigments, inks and fabrics and also rheological properties of the inks were investigated. The results showed that the ceramic ink prepared with nano-luminescent pigment had high photoluminescence (PL) intensity. Moreover, the optimum concentrations of Mn and PVP for obtaining maximum PL intensity were found as 2 and 5 wt%, respectively. SEM images of fabrics indicated that nanoparticles were loaded, nonuniformly, on the fibers. The treated linen and nylon fabrics showed maximum and minimum PL intensity, respectively, due to ink penetration depth in the fabrics. Furthermore, washing fastness estimated for all fabrics was in the proper range.

Effect of the morphology of the surface of a transparent conducting support on the structure of ZnS � Mn films and the parameters of the voltage ? brightness curve

Effect of the morphology of the surface of a transparent conducting support on the structure of ZnS � Mn films and the parameters of the voltage ? brightness curve

Role of Carrier Polarization in the Mechanism of the Electroluminescence of ZnSMn Films

AbstractA polarization which remains constant over a period of time and is caused by the accumulation of carriers in deep surface traps is observed in EL ZnSMn films. The polarization characteristics (i.e., the number of polarization charges, the time‐dependence of its formation and destruction, the ionization energy of the traps, etc.) are determined in order to study the role of carrier polarization in the mechanism of EL. It is established that the polarization mainly affects the change in the internal field and therefore the impact ionization probability. Also, at the instant of voltage‐polarity reversal, the polarization charge ionization leads to an increase in the number of carriers which can accelerate. All the EL properties and features of ZnSMn films may be explained on the basis of an impactionization mechanism if the polarization effects are taken into account.

Investigation of the characteristics of low-voltage electroluminescent films of ZnS � Mn excited by pulses

The brightness waves resulting from excitation by square pulses, the time constant of the flash initiation and of the electroluminescence decay, the average brightness of low-voltage ZnS · Mn films as a function of the voltage-pulse duration, the frequency of these pulses, and their amplitude and polarity were investigated. The equivalent circuit of cells with such electroluminescent films is discussed. A “flash” can be observed when the first of a series of monopolar pulses are applied to the cell or when the polarity of the pulses is changed. It was established that the average brightness of the electroluminescence from ZnS·Mn films can be increased considerably when pulses with varying polarity are applied instead of unipolar pulses.

The electroluminescence efficiency of an evaporated ZnSMn phosphor: F. F. Kodzhespirov and S. A. Kostylev, Opt. and Spectrosc., 15 (2), Aug. 1963, 144–146

The electroluminescence efficiency of an evaporated ZnSMn phosphor: F. F. Kodzhespirov and S. A. Kostylev, Opt. and Spectrosc., 15 (2), Aug. 1963, 144–146