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A kind of fluorine-based blue fluorescent powder and preparation method thereof

A blue phosphor, fluoride technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor comprehensive performance of blue phosphors, and achieve good physical and chemical properties, pollution-free, and environment-friendly. Effect

Active Publication Date: 2018-04-20
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall performance of blue phosphors is poor, and it is not as good as red and green phosphors in terms of color rendering performance and stability. Therefore, the study of blue phosphors with good performance not only has certain theoretical significance, but also has important practical applications. significance

Method used

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  • A kind of fluorine-based blue fluorescent powder and preparation method thereof
  • A kind of fluorine-based blue fluorescent powder and preparation method thereof
  • A kind of fluorine-based blue fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Sr 7 Y 5.9994 Ce 0.0006 OF 30

[0028] According to the chemical formula Sr 7 Y 5.9994 Ce 0.0006 OF 30 The stoichiometric ratio of each element in the formula is weighed as strontium fluoride SrF 2 : 2.1983 g, yttrium oxide Y 2 o 3 : 1.6934 g, cerium oxide CeO 2 : 0.0003 g, after grinding and mixing well in an agate mortar, buried in 4.6702 g of ammonium fluoride NH 4 In F, select a reducing atmosphere for pre-calcination, the pre-calcination temperature is 450°C, and the pre-calcination time is 14 hours, then cool to room temperature, and take out the sample; the pre-calcined sample is fully mixed and ground again, and buried in 4.6702 grams of fluoride Ammonium NH 4 In F, the final calcination is carried out in a reducing atmosphere, the calcination temperature is 1350° C., the calcination time is 2 hours, and it is naturally cooled to room temperature, and the sample is taken out to obtain the blue phosphor.

[0029] See attached figure 1...

Embodiment 2

[0034] Preparation of Sr 7 Y 5.994 Ce 0.006 OF 30

[0035] According to the chemical formula Sr 7 Y 5.994 Ce 0.006 OF 30 The stoichiometric ratio of each element in the formula is weighed as strontium carbonate SrCO 3 : 2.5835 g, yttrium fluoride YF 3 : 2.1863 grams, cerium nitrate Ce (NO 3 ) 3 ·6H 2 O: 0.0065 g, ground and mixed well in an agate mortar, buried in 5.7316 g of ammonium fluoride NH 4In F, select a reducing atmosphere for pre-calcination, the pre-calcination temperature is 400 ° C, the pre-calcination time is 15 hours, then cool to room temperature, take out the sample; the pre-calcined sample is fully mixed and ground again, and buried in 5.7316 grams of fluoride Ammonium NH 4 In F, the final calcination is carried out in a reducing atmosphere, the calcination temperature is 1400° C., the calcination time is 1 hour, and it is naturally cooled to room temperature, and the sample is taken out to obtain a powder blue phosphor.

[0036] Its main excita...

Embodiment 3

[0038] Preparation of Sr 7 Y 5.97 Ce 0.03 OF 30

[0039] According to the chemical formula Sr 7 Y 5.97 Ce 0.03 OF 30 The stoichiometric ratio of each element in the element, weigh strontium nitrate Sr(NO 3 ) 2 : 3.7035 grams, yttrium nitrate Y (NO 3 ) 3 ·6H 2 O: 5.7172 g, cerium tetrafluoride CeF 4 : 0.0119 g, after grinding and mixing well in an agate mortar, buried in 11.3191 g of ammonium fluoride NH 4 In F, select a reducing atmosphere for pre-calcination, the pre-calcination temperature is 550°C, and the pre-calcination time is 10 hours, then cool to room temperature, and take out the sample; the pre-calcined sample is fully mixed and ground again, and buried in 11.3191 grams of fluoride Ammonium NH 4 In F, the final calcination is carried out in a reducing atmosphere, the calcination temperature is 950° C., the calcination time is 12 hours, and it is naturally cooled to room temperature, and the sample is taken out to obtain a powder blue phosphor.

[0040...

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Abstract

The invention discloses fluoborate-based blue fluorescent powder and a preparation method thereof. A chemical general formula of the fluorescent powder is Sr7Y6-6xCe6xOF30, wherein x is a mole percent of doped Ce<3+> and x is more than or equal to 0.0001 and smaller than or equal to 0.05. Raw materials are buried into ammonium fluoride NH4F, which is 1 to 2 times of the total weight, for a plurality of times, and are calcined to obtain the blue fluorescent powder. The material prepared by the invention can be effectively excited by ultraviolet light with the length of 309 nanometers to emit blue light with the length of 375 to 450 nanometers; the material has a very wide excitation spectrum and luminescence spectrum and can be matched with an ultraviolet LED (Light Emitting Diode) chip very well; the obtained material has uniform granularity, high luminous efficiency and good chemical stability, can be applied to various types of illumination display and adjustment of luminous chroma and has a good actual application prospect; a process for preparing the material is simple and causes no pollution, and the material is environment-friendly and is suitable for industrial production.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a fluoride-based blue fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] Since Nichia first developed white LEDs in 1996, white LEDs have attracted extensive research due to their small size, long life, energy saving and environmental protection, and have been hailed as green energy in the new century. [0003] At present, the most widely used white light LED with mature technology is mainly based on GaN-based chips that emit blue light and YAG:Ce phosphor powder, which is realized by exciting YAG:Ce to emit yellow light and blue light, which has high efficiency and low manufacturing cost. Low, but due to the lack of green and red components in its emission spectrum, especially in the red region, the luminous efficiency is not high, resulting in a relatively low col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86
CPCC09K11/777
Inventor 乔学斌
Owner 徐州博创建设发展集团有限公司
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