Journal of Materials Science

, Volume 53, Issue 9, pp 6414–6423 | Cite as

Tunable luminescence properties and energy transfer of single-phase Ca4(PO4)2O: Dy3+, Eu2+ multi-color phosphors for warm white light

Chemical routes to materials
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Abstract

The novel Ca4−x(PO4)2O: xDy3+ and Ca4−xy(PO4)2O: xDy3+, yEu2+ multi-color phosphors were synthesized by traditional solid-state reaction. The crystal structure, particle morphology, photoluminescence properties and energy transfer process were investigated in detail. The X-ray diffraction (XRD) results demonstrate that the products showed pure monoclinic phase of Ca4(PO4)2O when x < 0.1. The scanning electron microscopy (SEM) indicated that the phosphors were grain-like morphologies with diameters of ~ 3.7–7.0 μm. Under excitation of 345 nm, Dy3+-doped Ca4(PO4)2O phosphors showed multi-color emission bands at 410, 481 and 580 nm originated from oxygen vacancies and Dy3+. Interestingly, Ca4(PO4)2O: Dy3+, Eu2+ phosphors exhibited blue emission band at 481 nm and broad emission band from 530 to 670 nm covering green to red regions. The energy transfer process from Dy3+ to Eu2+ was observed for the co-doped samples, and the energy transfer efficiency reached to 60% when Eu2+ molar concentration was 8%. In particular, warm/cool/day white light with adjustable CCT (2800–6700 K) and high CRI (Ra > 85) can be obtained by changing the Eu2+ co-doping contents in Ca4(PO4)2O: Dy3+, Eu2+ phosphors. The optimized Ca3.952(PO4)2O: 0.04Dy3+, 0.008Eu2+ phosphor can achieve the typical white light with CCT of 4735 K and CRI of 87.

Notes

Acknowledgements

This research is financially supported by the Natural Science Foundation of Liaoning Province (20170540065), the General Project of Liaoning Provincial Education Department (2016J057) and the Start-up Funding for Doctoral researchers of Dalian Polytechnic University (61020726).

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Authors and Affiliations

  1. 1.Research Institute of PhotonicsDalian Polytechnic UniversityDalianChina
  2. 2.The Second Affiliated HospitalDalian Medical UniversityDalianChina

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