| Summary: | 碩士 === 國立新竹教育大學 === 人資處應用科學系教學碩士班 === 96 === In this experiment, zinc sulfide phosphor nanopowder was prepared by thioacetamide (TAA) and zinc acetate dihydrate with chemical solution precipitation method under various temperature and reaction time. Adjustment of various reaction parameters such as pH, protecting agent and Mn dopant have used to the discussion of resulting zinc sulfide phosphor powder on the structure, particle size and illumination nature. The experiment result analysis, using XRD, SEM and EMAX, to determine the crystal structure, size distribution and the composition of particles; fluorescence spectroscopy (FL) was utilized to characterize the illumination properties.
The experimental result show that ZnS and ZnS：Mn phosphors prepared by the chemical precipitation method were cubic crystal structure in XRD spectrum analysis. The resulting data, estimating from the Debey Scherrer formula, showed that the particle size about 10nm.
In FL spectrum analysis, 555nm light illumination was obtained from stimulation after energy transfer near 525nm.The result showed that the zinc sulfide phosphor has strongest luminous intensity under reactant pH = 8 ; and the influence of neither size distribution nor luminous intensity has been observed after the addition of protecting agent PEG and PVP. Thus, we can prepare nano-scale ZnS phosphors by chemical precipitation method using thioacetamide and zinc acetate dehydrate without adding any additional protecting agent.
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