A method for preparing silicon-aluminum nitride or nitrogen oxide phosphor

A technology of nitrogen oxides and nitrides, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as operability, low stability and repeatability, complex control factors such as solubility ratio, complex chemical reaction process, etc. , to achieve the effect of ensuring uniformity and stability, good crystallization and simple process
CN105778903BActive Publication Date: 2018-12-18QINGDAO CUP NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
QINGDAO CUP NEW MATERIALS CO LTD
Publication Date
2018-12-18

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Abstract

The invention belongs to the technical field of fluorescent powder preparation, particularly relates to a method for freeze drying and auxiliary combustion synthesis of silicon-aluminum nitride or oxynitride fluorescent powder, and is characterized in that the method is implemented according to the following steps: (1) weighing raw material powder and a PVB binder according to the stoichiometric proportion of a fluorescent material; (2) adding the raw material powder and the binder to a tertiary butanol solvent, and carrying out ball milling, to obtain an evenly mixed slurry; (3) freezing and curing the obtained slurry for 2 h to 6 h; (4) placing the cured blank in a freezing dryer, carrying out vacuum drying to obtain a porous blank; and (5) placing the porous blank in a combustion synthesis reaction kettle, placing a Ti powder on the upper surface of the front end of the blank to be used as an igniting agent, vacuumizing, then filling nitrogen gas, and triggering the blank to carry out combustion synthesis reaction. The prepared silicon-aluminum nitride or oxynitride fluorescent powder has the advantages of uniform particle size distribution and good crystallization, allows the product to have no sintering agglomeration phenomenon, has no need for a subsequent crushing treatment process, and has significant advantages in preparation cost.
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Description

technical field

[0001] The invention belongs to the technical field of fluorescent powder preparation, and in particular relates to a method for synthesizing silicon-aluminum nitride or nitrogen oxide fluorescent powder with freeze-drying assisted combustion. Background technique

[0002] Silicon-aluminum nitride or oxynitride phosphors have a very rich crystal structure. By changing the local crystal structure around the active ion, the energy level of the active ion can be split by crystal field, so as to obtain near-ultraviolet and blue light excitation and rich The emission spectrum, including red, green, yellow, and blue luminescence, has attracted great attention from the scientific and industrial circles.

[0003] At present, the synthesis and preparation methods of silicon-aluminum nitride or nitrogen oxide phosphor mainly include high-temperature solid-state reaction method, gas phase reduction nitriding method, carbothermal reduction nitriding method, direct nitrid...

Claims

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