A double perovskite type molybdate red phosphor and preparation method thereof

Abstract

The invention discloses a double perovskite type molybdate red fluorescent powder and a preparation method thereof. The chemical structural formula of the fluorescent powder is: (Ba 1‑x , Eu x ) 2 MgO 6 , wherein, 0.01≤x≤0.2; it is prepared by the sol-gel method using EDTA and citric acid as complexing agents. The double perovskite fluorescent powder provided by the invention is based on molybdate, using Ba 2+ , Mg 2+ Occupy the "A" site and "B" site respectively, forming a stable double perovskite structure and regulating the Eu 3+ Replace Ba 2+ The relative content (0.01≤x≤0.2) can increase the intensity of red light emission, not only strong red light emission can be obtained under the excitation of LED near-ultraviolet chip, but also a higher intensity can be obtained under the excitation of LED blue light chip, and The pure-phase double perovskite powder can be obtained at a lower temperature and in a shorter time, and 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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