Abstract
The white-light phosphors consisting of Dy3+doped YPO4and Dy3+doped YP1-XVXO4were prepared by the chemical coprecipitation method. After the 1200°C thermal treatment in the air atmosphere, the white-light phosphors with particle sizes around 90 nm can be obtained. In order to reduce the average particle size of phosphors, the alkaline washing method was applied to the original synthesis process, which reduces the particle sizes to 65 nm. From the PLE spectra, four absorption peaks locating at 325, 352, 366, and 390 nm can be observed in the YPO4-based phosphors. These peaks appear due to the following electron transitions:6H15/2→4K15/2,6H15/2→4M15/2+6P7/2,6H15/2→4I11/2, and6H15/2→4M19/2. Besides, the emission peaks of wavelengths 484 nm and 576 nm can be observed in the PL spectra. In order to obtain the white-light phosphors, the vanadium ions were applied to substitute the phosphorus ions to compose the YP1-XVXO4phosphors. From the PL spectra, the strongest PL intensity can be obtained with 30% vanadium ions. As the concentration of vanadium ions increases to 40%, the phosphors with the CIE coordinates locating at the white-light area can be obtained.
Highlights
Due to the excellent luminescent properties and chemical stabilities, the phosphors using yttrium vanadate (YVO4) and yttrium phosphate (YPO4) as the host materials have been used in a broad range of daily life, such as the cathode ray tubes, electroluminescence devices, field emission displays, plasma display panels, projection displays, and ultraviolet light-emitting diodes (UV-LEDs) [1,2,3,4]
The white-light phosphors with average particle size 90 nm can be obtained through the chemical coprecipitation method with suitable thermal treatments in this study
The alkaline-washing process was applied to the original synthesis
Summary
Due to the excellent luminescent properties and chemical stabilities, the phosphors using yttrium vanadate (YVO4) and yttrium phosphate (YPO4) as the host materials have been used in a broad range of daily life, such as the cathode ray tubes, electroluminescence devices, field emission displays, plasma display panels, projection displays, and ultraviolet light-emitting diodes (UV-LEDs) [1,2,3,4]. In addition to the Eu3+ ions, the phosphor doped with dysprosium (Dy3+) ions is a potential luminescent material. Owing to the same crystal structure, similar lattice constants, and similar physical and chemical properties between YPO4 and YVO4 phosphors, the material Y(P,V)O4 has been paid much attention to in recent decades [13,14,15]
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