Rare earth ion Tb3+ doped natural sodium feldspar (NaAlSi3O8) Luminescent properties and energy transfer

Dilare Halmurat,Taximaiti Yusufu,Jiuyang He,Aierken Sidike,Qing-Ling Wang

doi:10.1038/s41598-019-51171-3

Dilare Halmurat, Taximaiti Yusufu + Show 3 more

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https://doi.org/10.1038/s41598-019-51171-3

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Abstract

In this study, Tb3+—doped natural sodium feldspar (NaAlSi3O8) phosphors have been successfully prepared using high−temperature solid—state method with natural sodium feldspar as a substrate. Energy—dispersive X—ray spectrometry analysis (EDX) of NaAlSi3O8 showed that 0.03 wt% of Eu element was present, and elemental distribution mapping analysis showed that the distribution of trace Eu in minerals was aggregated. The crystal structure and luminescence properties of the natural sodium Eu—containing feldspar and synthetic sodium feldspar NaAlSi3O8:Eu3+, Tb3+ phosphors are discussed in detail. The crystal structure analysis of the samples showed that the Na+ in the natural matrix was partly replaced by the doped Tb3+. Studies on the photoluminescence properties of the samples indicate that Eu does not form a luminescent center in the natural mineral, however, the strong characteristic peak of Eu3+ at 615 nm appears after doping with Tb3+ and the peak at 615 nm increases with the increase of Tb3+ concentration. According to the above spectral results, the energy transfer from Tb3+ to Eu3+ is obtained. Through the measurement and analysis of color coordinates, it is found that with the increase of Tb3+ concentration, the luminescence color of the samples can be regulated in the green to red region. NaAlSi3O8:Eu3+ Tb3+ phosphors has potential application value.

Highlights

IntroductionStudies on the photoluminescence properties of the samples indicate that Eu does not form a luminescent center in the natural mineral, the strong characteristic peak of Eu3+ at 615 nm appears after doping with Tb3+ and the peak at 615 nm increases with the increase of Tb3+ concentration
The minerals used in this experiment were analyzed by the Energy-dispersive X-ray spectrometry (EDX)
The increasing concentration of Tb3+ will transfer energy to Eu3+, which will increase the emission peak at 615 nm. These results show that the obtained samples exhibit the advantages of polychromatic emission in the visible region and have potential applications in the field of solid illumination

Summary

Introduction

Studies on the photoluminescence properties of the samples indicate that Eu does not form a luminescent center in the natural mineral, the strong characteristic peak of Eu3+ at 615 nm appears after doping with Tb3+ and the peak at 615 nm increases with the increase of Tb3+ concentration. In 2017, Hairegu T et al studied the luminescent properties of Sm3+ doped natural albite phosphors and obtained high-quality fluorescent materials with high purity in the orange-red region. Eu3+ is very effective because their energy level distributions have a large overlap We use this feature to achieve the energy transfer of Tb → Eu by doping Tb into albite, which causes the luminescence of Eu. By changing the concentration of terbium, phosphors emitting different fluorescent colors are obtained

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