Enhanced green emission from UV down-converting Ce3+-Tb3+ co-activated
- Enhanced green emission from UV down-converting Ce3+-Tb3+ co-activated
- K. G. Tshabalala; I. M. Nagpure; H. C. Swart; O. M. Ntwaeaborwa; 조소혜; 박종구
- phosphor; ZnAl2O4; down conversion; Ce Tb
- Issue Date
- Journal of Vacuum Science and Technology B
- VOL 30, NO 3, 031401-1-031401-6
- Ce3+–Tb3+ co-activated ZnAl2O4 powder phosphors were prepared by a solution combustion method using urea as a fuel. X-ray diffraction characterization showed that all the powders crystallized in the well known cubic spinel phase of ZnAl2O4. An enhanced down-converted green emission associated with the 5D4→7F5 transitions of Tb3+ ions was observed at 543 nm from the ZnAl2O4:Ce3+, Tb3+ powders with different concentrations of Ce3+ and Tb3+. It was inferred from the fluorescence decay data that the enhancement was due to energy transfer from Ce3+ to Tb3+. Further, cathodoluminescence intensity degradation of the ZnAl2O4:Ce3+, Tb3+ powder phosphors was investigated when the powders were irradiated with 2 keV electrons. X-ray photoelectron spectroscopy was used to analyze the chemical and electronic states of individual elements before and after electron irradiation. The ZnAl2O4:Ce3+, Tb3+ phosphor was evaluated to be used as a UV down-converting layer in conventional silicon photovoltaic cells or as a source of green light in field emission display technologies.
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