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Luminescence properties and energy transfers of NaLa(WO4)2:Sm3+:Ce3+ phosphor

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Abstract

A series of NaLa(WO4)2:Sm3+:Ce3+ phosphors are prepared by the hydrothermal method. The structure, morphology, luminescent properties of sample are characterized with X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, and fluorescence spectrophotometer. The results show that all the obtained products have the scheelite structure with ellipsoidal shapes. Ce3+ has quenching effects on luminescence properties of NaLa(WO4)2:Sm3+ phosphors at high Ce3+ doping concentration. When the Ce3+ molar content is 1%, the intensity of the excitation and emission spectra is the maximum. It indicates that when the sensitizer Ce3+ has the molar content of 1%, the sensitizing ability of luminescent properties of NaLa(WO4)2:Sm3+:Ce3+ phosphors is the strongest. That is, Ce3+ can transfer energy to Sm3+. The critical distance of Ce3+ → Sm3+ energy transfer is 2.196 nm. The type of energy transfer of Ce3+ → Sm3+ is electric multi-pole interaction. The maximum energy transfer efficiency of Ce3+ → Sm3+ in NaLa(WO4)2:Sm3+:Ce3+ phosphors can reach 15.17%. The temperature-dependent emission spectra demonstrates that the NaLa(WO4)2: 0.02Sm3+:0.01Ce3+ phosphor has a good thermal stability with a thermal activation energy ΔE of 0.2789 eV. The CIE coordinates show that the phosphor is red, and is the potential red phosphor for LEDs.

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Acknowledgements

This work is supported by a Grant from fund of Nature Science of China (Grant Nos. 51634005 and 51662033), and fund of Nature Science of Inner Mongolia autonomous region, China (No. 2017MS(LH)0208).

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Correspondence to Mei Li.

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Li, M., Wu, J., Jia, H. et al. Luminescence properties and energy transfers of NaLa(WO4)2:Sm3+:Ce3+ phosphor. J Mater Sci: Mater Electron 30, 10465–10474 (2019). https://doi.org/10.1007/s10854-019-01389-8

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  • DOI: https://doi.org/10.1007/s10854-019-01389-8

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