研究目的
To compare the fracto-mechanoluminescence (FML) from ZnS:Mn and ZnS:Cu phosphors prepared by solid state reaction (SSR) route in terms of its dependence on time and velocity.
研究成果
The ML intensity of ZnS:Mn phosphor is found to be 2.07 times greater than ZnS:Cu phosphor during impulsive excitation by cylindrical piston. The peak ML intensity increases linearly with impact velocity for cylindrical piston and quadratically for steel ball. ML and PL spectra of ZnS:Mn phosphor lie at the same wavelength, indicating the same center is responsible for luminescence, whereas for ZnS:Cu, the ML spectrum shifts towards shorter wavelength by 5 nm compared to PL spectrum.
研究不足
The study is limited to the comparison of FML properties of ZnS:Mn and ZnS:Cu phosphors under specific conditions of impulsive excitation by cylindrical piston and steel ball. The exact mechanism of fracture and the role of shallow and deep traps in the crystals require further study.
1：Experimental Design and Method Selection:
The study involved the preparation of ZnS:Mn and ZnS:Cu phosphors using solid state reaction technique (SSRT) and comparing their FML properties under impulsive excitation by cylindrical piston and steel ball.
2：Sample Selection and Data Sources:
Microcrystalline ZnS:Mn
3：05 and ZnS:
Cu
4：01 phosphor samples were prepared using analytical grade ZnS, MnCl2, Cu(CH3COO)2 and 4% NaCl flux. List of Experimental Equipment and Materials:
PANalytical 3 kW X’pert Powder – Multifunctional diffractometer for XRD, ZEISS-EVO 18 scanning electron microscope (SEM) for morphology, Carry eclipse fluorescence spectrophotometer for PL spectra, RCA-931A photomultiplier tube (PMT) for ML intensity measurement.
5：Experimental Procedures and Operational Workflow:
ML measurements were performed by placing the sample on a transparent lucite plate inside a sample holder, covered with a thin aluminum foil, and excited impulsively by dropping a load onto the sample from a fixed height. The luminescence intensity was measured using a PMT.
6：Data Analysis Methods:
The output of the PMT was fed to a storage oscilloscope, and ML spectra were recorded using a constant deviation spectrometer.
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