1. Efficient energy transfer from Ce3+ to Tb3+ in BaF2: green-emitting phosphors for potential applications in the detection of Cu2+ ions.
- Author
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He, Wenxiang, Du, Hongli, Fu, Juan, Luan, Fangfei, Li, Dewei, Sun, Liyuan, and Guo, Dongcai
- Subjects
TERBIUM ,ENERGY transfer ,PHOSPHORS ,COPPER ions ,EMISSION spectroscopy ,FLUORESCENCE quenching ,TRANSMISSION electron microscopy - Abstract
A succession of Ce
3+ and Tb3+ co-doped BaF2 nanoparticles were synthesized by co-precipitation and hydrothermal methods. The structure, morphology, elemental composition and photoluminescence characteristics of the doped samples were studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM), X-ray energy spectrometry (EDX), photoluminescence emission spectroscopy (PL) and photoluminescence excitation spectroscopy (PLE). The phosphor has a cubic structure. According to the energy level relationship between Ce3+ and Tb3+ , the energy transfer mechanism of Ce3+ and Tb3+ co-doped BaF2 samples was analyzed. Ce3+ , Tb3+ co-doped BaF2 shows a strong green emission, and its fluorescence emission intensity is about 9 times higher than that of Tb3+ single doped BaF2 . The energy transfer efficiency from Ce3+ to Tb3+ was calculated using a formula, and it was found that the energy transfer efficiency could reach up to 88.22%. The detection solution was prepared by uniformly dispersing the phosphor in absolute ethanol. Through a comparative study of a series of metal ions, it was found that the detection solution has a peculiar sensitivity to aqueous solutions containing Cu2+ . At the same time, the relationship between the fluorescence intensity of the detection solution and the concentration of Cu2+ was studied, and the cause of fluorescence quenching caused by Cu2+ ions was analyzed from the perspective of energy transfer. From this work, it is considered that the phosphor has a great potential application in the determination of Cu2+ in practical wastewater. [ABSTRACT FROM AUTHOR]- Published
- 2021
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