Abstract
A new type of NaYSnMoO7: Eu3+ phosphor was prepared by the solid-state reaction. Using the Eu3+ ion as a probe, the structural, the micro-structure and the photoluminescence properties of NaYSnMoO7: Eu3+ were studied. The NaYSnMoO7: xEu3+ phosphor exhibited intense red emission at 617 nm under 395 or 466 nm excitation corresponding to the electric dipole (5D0→7F2) transition, which indicated that Eu3+ ions occupied the asymmetric position in the NaYSnMoO7 matrix. The optimal Eu3+-doping concentration was 30 mol% and the concentration quenching mechanism was electrostatic multipole interaction. The Judd-Ofelt (J-O) parameters, the quantum efficiency and gain bandwidth of NaYSnMoO7: 0.30Eu3+ phosphor were calculated. The J-O parameters Ω2＞Ω4 confirmed that the Eu3+ ions occupied asymmetric position in the matrix. The calculated quantum efficiency, the color purity and gain bandwidth were as high as 84%, 92% and 4.90 × 10−27 cm3, respectively. The CIE color coordinates of NaYSnMoO7: 0.30Eu3+ phosphor are closer to the standard red coordinates (0.67, 0.33) than commercial Y2O2S: Eu3+ phosphor (0.622, 0.351). These results suggest that the NaYSnMoO7: Eu3+ phosphors are promising red-emitters for white light-emitting diodes.
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