Synthesis and Luminescent Modulation of ZnS Crystallite by a Hydrothermal Method.

Pure and Eu-doped zinc sulfide (ZnS) crystallites were synthesized through a hydrothermal method using water and ethanol (W/E) as the solvent. The powder samples have been characterized systematically using a number of characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, photoluminescence spectroscopy, and UV-vis absorption spectroscopy. The band gap of ZnS and ZnS/Eu was calculated according to absorption spectroscopy, and an obvious red shift with the increasing molar fraction of Eu-doped ions was found.

Preparation, structure and luminescent properties of Eu3+ doped MBPO5 (M = Ca, Sr, Ba) red phosphor for white LED.

Motivation: A suite of MBPO5 (borophosphates-BPO):Eu3+ (M = Ca, Sr, Ba) red emitting phosphors were synthesized and their luminescent properties were studied by excitation and emission spectra.

Results: The energy gap of CBPO, SBPO and BBPO are 5.481, 5.

[Microanalysis study of Co-doped ZnO DMS crystal by SEM and XREDS].

In the present paper,with CoCl2 x 6H2O used as precursor, Co-doped ZnO diluted magnetic semiconductor (DMS) crystals were synthesized by hydrothermal method with KOH as mineralizer. The morphology, and the relative content and distribution uniformity of the surface and inner Co element of synthesized crystals were investigated by scanning electron microscope (SEM) and X-ray energy dispersive spectrometry (XREDS), respectively. It was found that Co-doped ZnO crystals with different morphology were yielded, while the bigger crystals showed polar growth charactertistics, and the Co content in the crystal depended on its morphology.

[Photoelectron time-resolved spectrum and phosphor spectrum of luminescent material ZnO by microwave absorption method].

The process of decay of photo-generated electrons in the conduction band of ZnO:Zn and ZnO powder materials after excitation with a ultra-short pulse laser has been investigated in this paper by microwave absorption method. The excitation and emission spectra of ZnO:Zn were measured at room temperature. It was measured that the lifetime o photoelectrons in the materials ZnOand ZnO:Zn are 64 ns and 336 ns respectively.

[Effect of the Cu+ concentration on the curve of thermoluminescence of ZnS:Cu electroluminescent material].

In the paper, five ZnS:Cu electroluminescent material specimens were prepared by adding 0.05%, 0.10%, 0.