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Eu3+ co-doped Sr3Gd(PO4)3:Dy3+ phosphors: luminescence properties and color-tunable white-light emission for NUV-WLEDs

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Abstract

A series of Dy3+ and Eu3+ co-doped Sr3Gd(PO4)3 phosphors were synthesized by a high-temperature solid-state method. The crystal structure, optical band gap energy, luminescence properties, concentration quenching, energy transfer process and thermal stability were investigated. All the phosphors are pure eulytite-type Sr3Gd(PO4)3 in structure. Under different wavelengths’ excitation, the Sr3Gd(PO4)3:Dy3+, Eu3+ phosphors exhibit different emission intensities for Eu3+ and Dy3+. The color and correlated color temperature (CCT) can be tuned from cool white to warm white by adjusting excitation wavelengths and the doping concentration of Eu3+. Under the 351-nm excitation, the optimal Sr3Gd(PO4)3:0.03Dy3+, 0.085Eu3+ phosphor displays a warm white emission with CIE coordinate of (0.3987, 0.3613), CCT of 3409 K, internal quantum efficiency of 44.8% and activation energy of 0.1883 eV. These results suggest that single-phased white-emitting phosphors Sr3Gd(PO4)3:Dy3+, Eu3+ can be used in the near-ultraviolet light-emitting diodes.

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Acknowledgements

This work was supported by the Natural Science Foundation of Inner Mongolia 2018MS02002.

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Authors and Affiliations

  1. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Bin Fan & Limin Han

  2. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China

    Bin Fan & Wenyu Zhao

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  1. Bin Fan
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  2. Wenyu Zhao
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  3. Limin Han
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Correspondence to Limin Han.

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Fan, B., Zhao, W. & Han, L. Eu3+ co-doped Sr3Gd(PO4)3:Dy3+ phosphors: luminescence properties and color-tunable white-light emission for NUV-WLEDs. Appl. Phys. A 126, 260 (2020). https://doi.org/10.1007/s00339-020-3444-5

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  • DOI: https://doi.org/10.1007/s00339-020-3444-5

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