Double perovskite-type molybdate red phosphor and preparation method thereof

Abstract

The invention discloses a double perovskite-type molybdate red phosphor and a preparation method thereof. A chemical formula of the phosphor is: (Ba1-x, Eux) 2MgMoO6, wherein x is greater than or equal to 0.01 and less than or equal to 0.2; and the red phosphor is prepared by using EDTA and citric acid as complexing agents through a sol-gel method. The double perovskite phosphor provided by the invention uses molybdate as a matrix, and uses Ba<2+> and Mg<2+> to occupy a A position and a B position respectively, a stable double perovskite structure is formed, the relative content of Eu<3+> instead of Ba<2+> (x is greater than or equal to 0.01 and less than or equal to 0.2) is adjusted to increase the intensity of red light emission, not only strong red light emission can be obtained under the excitation of a LED near ultraviolet chip, but also high intensity can be obtained under the excitation of a LED blue chip, the pure-phase double perovskite powder can be obtained at lower temperature in a shorter time, the production cycle is short, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a fluorescent powder, in particular to a double perovskite type molybdate red fluorescent powder and a preparation method thereof. Background technique [0002] In solid-state lighting, white light-emitting diodes (WLEDs) are widely used in flat panel displays, road lighting, etc. due to their high efficiency, long lifetime, low energy consumption, and small size. White light The most mature way to achieve white light emission is the phosphor conversion method, which is to coat the phosphor around the chip. In the way of combining InGaN chips (370-410nm) and three primary color phosphors (red, green, blue) to emit white light, the currently commercialized red phosphors are mainly CaS:Eu 3+ , but CaS:Eu 3+ Under the same excitation conditions as phosphor powder and blue-green powder, the emission intensity is much lower, and the color rendering index is ve...

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Problems solved by technology

[0007] (3) When different element types occupy the "A" site and "B" site, the "A" site ions have different lattice symmetries, which will greatly affect the ultrasensitive transition of rare earth ions doped into their positions

[0008] Meanwhile, in Eu 3+ When doping, there are several obvious problems in the molding process of this type of phosphor: ①Excessive temperature of solid phase reaction will cause problems such as abnormal growth of crystal grains, introduction of impurities, and agglomeration of powder

②The single complexing agent used in sol-gel will also cause problems such as powder precipitation in the sol process or too long gel time

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