Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor

摘要

The fabrication and luminescent performance of novel phosphors Na YMg V O :Dy were investigated by a conventional solid-state reaction method. Under near-UV light, the Na YMg V O host self-activated and released a broad emission band (400–700 nm, with a peak at 524 nm) ascribable to charge transfer in the (VO ) groups. Meanwhile, the Na YMg V O :Dy phosphors emitted bright yellow light within both the broad emission band of the (VO ) groups and the sharp peaks of the Dy ions at 490, 582, and 663 nm at a quenching concentration of 0.03 mol. The emission of the as-prepared Na YMg V O :Dy phosphors remained stable at high temperatures. The obtained phosphors, commercial Y O :Eu red phosphors, and BaMgAl O :Eu blue phosphors were packed into a white light-emitting diode (WLED) device with a near-UV chip. The designed WLED emitted bright white light with good chromaticity coordinates (0.331, 0.361), satisfactory color rendering index (80.2), and proper correlation to a color temperature (7364 K). These results indicate the potential utility of Na YMg V O :Dy phosphor as a yellow-emitting phosphor in solid-state illumination.