Effect of Eu³⁺ contents on structure and luminescence properties of Na₃Bi_2–x（PO₄）₃:xEu³⁺ and Na₃Bi_1–x（PO₄）₂:xEu³⁺ phosphors

傅广生，朱子忠，杨勇，杨志平，李盼来

Hebei Key Lab of Optic-Electronic Information and Materials,College of Physics Science & Technology,Hebei University

摘 要：A series of Na₃Bi_2–x（PO₄）₃:xEu³⁺ and Na₃Bi_1–x（PO₄）₂:xEu³⁺ phosphors were successfully synthesized by solid-state method.The structure and luminescence properties were carefully investigated.The excitation spectra presented an obvious excitation band,and the peak was located at 396 nm,which matched well with the popular emissions from near-UV light-emitting diode chips.With the phase of Na₃Bi_2–x（PO₄）₃:xEu³⁺ changing to that of Na₃Bi_1–x（PO₄）₂:xEu³⁺,the intensity of magnetic dipole transition（⁵D₀→F₁） at 598 nm became stronger than that of electric dipole transition（⁵D₀→⁷F₂） at 621 nm.Under 396 nm excitation,the chromaticity coordinates and the decay curves of the entitled phosphors were also investigated.Based on all experiments without concentration quenching,we could control the luminescence intensity of the material by adjusting the doping amount of the active ions.All results indicated that Na₃Bi_2–x（PO₄）₃:xEu³⁺ and Na₃Bi_1–x（PO₄）₂:xEu³⁺ phosphors have potential application as red phosphors in near UV chip-based white light emitting diodes.

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