Cubic strontium sodium niobate red fluorescent powder and preparation method thereof

Abstract

The invention discloses cubic strontium sodium niobate red fluorescent powder and a preparation method thereof. The preparation method comprises the following steps that SrCO3 and Nb2O5 are respectively weighed as raw materials according to a mol ratio of (0.45 to 0.6):1; the raw materials are put into a mortar and are ground at room temperature; after being sufficiently mixed, the raw materials are placed for use; NaCl is weighed as fused salt according to the ratio of the total mass of the prepared SrCO3 and Nb2O5 to the mass of NaCl is 1:(3 to 9); the fused salt and the raw materials weighed in the step (1) are mixed and are ground at the room temperature, so that the raw materials and the fused salt are uniformly mixed to obtain mixed powder. The cubic strontium sodium niobate powder with high phase purity, good dispersibility and uniform grain diameter is prepared by a fused salt method. Compared with other methods, the fused salt method has the advantages that the operation is easy; the granularity is controllable; the crystal morphology is good; the synthesis period short, and the like. The method is suitable for preparing uniformly dispersed powder with special morphology or regular shape. Because of the growth mechanism characteristic of the method, the synthesized powder is complete to crystallize and has few defects; the method is very suitable for synthesizing powder with the requirement of few defects.

Description

Technical field [0001] The invention belongs to the technical field of preparation of white LED fluorescent powder substrates, and relates to a cubic sodium strontium niobate red fluorescent powder and a preparation method thereof. Background technique [0002] Niobate phosphor for LED is a novel luminescent material, completely different from yellow light materials such as YAG and oxynitride. Niobate has good thermal stability, chemical stability, ferroelectric properties, dielectric properties, and easy doping and modification characteristics, so it is a good matrix material. Niobates include barium strontium niobate, lithium niobate, sodium potassium niobate and sodium strontium niobate, among which sodium strontium niobate with a tungsten bronze structure 0.7 Sr 0.15 NbO 3 It belongs to the tetragonal crystal system, and this structure is considered to be a derivative of the perovskite structure. This special structure makes the cations easily replaced by rare earth ions, so...

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Problems solved by technology

[0003] At present, high-temperature solid-phase method, sol-gel method, homogeneous co-precipitation method, combustion synthesis method, solvothermal method, etc. are often used in the synthesis of phosphor powder. The existing problems include high sintering temperature, long synthesis cycle, and high technical difficulty. Uneven particles, low safety, etc.

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