Rare earth magnets doped vanadate borate phosphors prepared by molten salt
Rare earth vanadate, borate its ultraviolet and vacuum ultraviolet region in a very good transparency and strong absorption and can effectively transfer energy to activate the ion, which is widely used in optical, electrical, magnetic, and other fields. However, after such material is mainly used to produce high temperature solid, due to serious pollution, excessive investment, preparation complex phosphor larger particle size, shape and so greatly affected is difficult to control the commercial use of such phosphors have been more and more suited to the needs of the current energy-saving society. Find low pollution, low cost, high performance products, preparation methods of light has become the mainstream of the current light-emitting materials industry. Molten salt method (MSS) developed rapidly in recent years a new type of powder synthesis process, low energy consumption, and therefore the production of phosphor areas of widespread concern. If the molten salt technology to the synthesis of these materials and will surely achieve better economic value and social benefits.
In this paper, molten salt method, the use of chloride or nitrate as the molten salt synthesis of light-emitting performance, crystalline sound of rare earth vanadate (YVO4: Eu3 +, YVO4: Sm3 +, YVO4: Dy3 +, YVO4: Dy3 + / Tm3 +) and borate (YBO3: Eu3 +, YBO3: Tb3 +) fluorescence material, synthetic uniform particle size, the average particle size of about a few hundred nanometers. Specific results were as follows:
1, the use of chloride, nitrate as the molten salt system, were successfully synthesized zircon structure of YVO4: Eu3 +, YVO4: Sm3 +, YVO4: Dy3 +, YVO4: Dy3 + / Tm3 + phosphor. Synthesized samples to UV light, are emitted characteristic emission of rare earth ions doped sample YVO4: Eu3 + emission peaks corresponding to the Eu3 + in the 5D0 → 7Fn (n = 0,1,2,3,4) transition. 5D0 → 7F2 transition in which the emission peak for the strongest emission peak, the average particle size of powder is about 150 nm. In YVO4: Eu3 + system to replace part of Bi3 + by Y3 +, to achieve the emission peak intensity of regulation.
2, YVO4: Sm3 + can also have Sm3 + characteristic emission, but with other reported doping Sm3 + luminescence materials, the molten salt synthesis of the sample at 647 nm at the Sm3 + in the 4G5 / 2 → 6H9 / 2 emission has been markedly strengthened, so that the samples sent bright red, instead of the usual orange light. When nitrate as the molten salt system, the optimum synthesis parameters: doping concentration of 1%; holding temperature is 500 ℃; holding time of 5 hours.
3, the sodium nitrate as the molten salt was successfully synthesized YVO4: Dy3 + yellow fluorescent material; On this basis, the introduction of Tm3 + synthesis of YVO4: Dy3 + / Tm3 + white fluorescent material, and by adjusting the Dy3 + / Tm3 + doping concentration ratio to achieve luminescent chromaticity coordinates of the regulation.
4, the use of nitrate as a molten salt system, was successfully synthesized hexagonal YBO3: Eu3 +, YBO3: Tb3 + phosphor. Fluorescence spectroscopy (PL) analysis showed that the samples had a rare-earth ions characteristic emission, red phosphor YBO3: Eu3 + emission peaks corresponding to the Eu3 +, 5D0 → 7F1, 5D0 → 7F2 transition, in which 5D0 → 7F1 transition in slightly stronger than the 5D0 → 7F2 ; yellow-green phosphor YBO3: Tb3 + emission peaks corresponding to the Tb3 + 5D4 → 7Fn (n = 3,4,5,6) transition. 5D4 → 7F5 transition in which the emission peak of a dominant position, the other showed a relatively weak transition lines.
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This thesis work by molten salt synthesis of rare earth doped fluorescent material that provides a theoretical and technological support.
