Praseodymium ion-doped potassium strontium borate fluorescent powder and high-temperature solid-phase preparation method

Abstract

The invention discloses a high-temperature solid-phase preparation method of praseodymium ion-doped potassium strontium borate fluorescent powder. The high-temperature solid-phase preparation method comprises the following steps: firstly, weighing raw materials according to a stoichiometric ratio; secondly, grinding the raw materials, thoroughly mixing and grinding to obtain the ground material, and drying; thirdly, putting the dried material into a high-temperature box-type resistance furnace, pre-calcining, taking out the pre-calcined material when the temperature is reduced to room temperature, grinding to obtain the reground material, and drying; fourthly, putting the redried material into the high-temperature box-type resistance furnace, and calcining at high temperature; finally, taking out the high-temperature calcined material when the temperature is reduced to room temperature, regrinding to obtain the required fluorescent powder. By the preparation method provided by the invention, the successful synthesis of samples can be ensured; in the samples, Pr3+ can substitute Sr2+ and K+, the strongest luminous intensity of a Sr2+-substituted sample is achieved when the doping amount is 1.5mol%, and the strongest luminous intensity of a K+- substituted sample is achieved when the doping amount is 1mol%; an experimental sample doped with a charge compensator (KSr4 (BO3)3: Pr3+, R+; R=Li, Na, K) has higher luminous intensity than a single-doped sample, and a sample doped with Li+ has the best effect. All samples emit red light.

Description

technical field [0001] The invention relates to the field of phosphor preparation, in particular to a method for preparing potassium strontium borate phosphor doped with praseodymium ions by a high-temperature solid-phase method. Background technique [0002] Rare earth-doped luminescent materials have a wide range of applications, which has attracted the attention of many researchers. Among them, the red phosphor plays a very important role in the application of LEDs. It can make up for the cold color of the white light formed after the blue chip and the yellow phosphor are packaged due to the lack of red light components. A large number of existing studies have shown that the chemically stable borate system is a kind of luminescent host material with excellent performance. where KSr 4 (BO 3 ) 3 It has a good orthorhombic lattice structure, and potassium atoms are in a lattice coordinated by eight oxygen atoms. Due to its wide application in luminescent materials and ot...

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Problems solved by technology

In addition, in doping substitution, after impurity ions replace matrix ions, the defect effect caused by the difference in electronegativity and radius of ions will also have a significant impact on luminescence.

[0003] There is no potassium strontium borate phosphor powder doped with praseodymium ions at present, especially the relevant reports on blue light excitation doped potassium strontium borate red phosphor powder with praseodymium ions and its preparation process. Therefore, a kind of potassium borate doped with praseodymium ions is needed. Strontium phosphor and its high-temperature solid phase preparation method

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