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A kind of preparation method of fluorescent powder and the fluorescent powder made therefrom

A phosphor and nitride phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of non-industrialized routes and easy pollution, and achieve the effects of regular shape, good crystallinity, and improved luminous brightness

Active Publication Date: 2016-05-04
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the means of preparing nitride phosphors are mostly evolved from the process of preparing nitride ceramic materials, such as high temperature and high pressure nitriding, gas phase reduction nitriding, carbothermal reduction nitriding (CRN) or self-propagating high temperature synthesis (SHS), etc. Among them, both high temperature and high pressure nitriding and self-propagating high temperature synthesis require high temperature (1700-2200 ° C), high pressure (5-10atm) and other conditions, while gas phase reduction nitriding requires long-term high temperature nitriding reduction, carbothermal reduction nitriding It is also necessary to introduce easily polluting powder carbon black, therefore, the above methods are not ideal industrial routes

Method used

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  • A kind of preparation method of fluorescent powder and the fluorescent powder made therefrom
  • A kind of preparation method of fluorescent powder and the fluorescent powder made therefrom
  • A kind of preparation method of fluorescent powder and the fluorescent powder made therefrom

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Embodiment 1

[0025] For the nitride phosphor powder of this embodiment, the preparation method of its calcined product is: according to 1.67mol Si 3 N 4 , 0.67molCa 3 N 2 Weigh the raw materials and mix them evenly. After holding the temperature at 1500°C for 10 hours under a nitrogen atmosphere, lower the temperature to below 100°C. After taking them out, perform post-processing such as grinding, sieving, and drying. In the prepared calcined product according to 0.998molCa 3 N 2 , 5.0molAlN, 0.005molEuN Weigh the raw materials and mix them evenly. Under nitrogen atmosphere, keep warm at 1500°C for 10 hours, then lower the temperature to below 100°C. , the color coordinates of the phosphor, the position of the main peak and the relative luminance and other light color data, as shown in Table 1.

Embodiment 2

[0027] For the nitride phosphor powder of this embodiment, the preparation method of its calcined product is: according to 1.67mol Si 3 N 4 , 0.67molCa 3 N 2 Weigh the raw materials and mix them evenly. Under a nitrogen-hydrogen atmosphere, where the volume ratio of hydrogen is 5%, keep warm at 1500°C for 10 hours, then lower the temperature to below 100°C, take it out, grind, sieve and dry, etc. deal with. In the prepared calcined product according to 0.998molCa 3 N 2 , 5.0molAlN, 0.005molEuN Weigh the raw materials and mix them evenly. Under nitrogen and hydrogen atmosphere, the volume ratio of hydrogen is 5%. , drying, sieving and other post-processing, the color coordinates of the phosphor, the position of the main peak and the relative luminance and other light color data are shown in Table 1.

Embodiment 3

[0029] For the nitride phosphor powder of this embodiment, the preparation method of its calcined product is: according to 1.67mol Si 3 N 4 , 0.67molCa 3 N 2 The raw materials were weighed and mixed uniformly, and the preparation method and post-treatment process were basically the same as in Example 2. According to 0.992mol Ca in the prepared calcined product 3 N 2 , 5.0molAlN, and 0.025molEuN were weighed and mixed uniformly. The preparation method and post-treatment process were basically the same as in Example 2. The color coordinates of the obtained phosphor powder, the position of the main peak and the relative luminous brightness and other light color data are shown in Table 1. The excitation spectrum of the obtained phosphor is as follows figure 1 shown by figure 1 It can be seen that the phosphor has a strong absorption for light of 325-500nm, and is suitable for ultraviolet, near ultraviolet and blue LEDs.

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Abstract

The invention discloses a preparation method of a fluorescent powder and the prepared fluorescent powder. The preparation method comprises the following steps: mixing M3N2(M is at least one element selected from Ca, Sr and Ba) and Si3N4 according to a stoichiometric ratio; calcining to obtain presintering products; mixing the obtained presintering products with required raw materials such as europium nitride, aluminium nitride, alkaline-earth metal nitride and the like; carrying out thermal insulation at 1200-1800 DEG C and sintering for 3-20h; and crushing sintered products, washing, grading and carrying out other treatments to obtain the fluorescent powder. In comparison with the prior art, the fluorescent powder prepared by the above preparation method has advantages of large grain size, good crystallinity, high heat stability, high brightness and the like.

Description

technical field [0001] The invention relates to a method for preparing fluorescent powder and the prepared fluorescent powder, belonging to the technical field of semiconductors. Background technique [0002] In recent years, the most eye-catching in the field of lighting is the rise of the LED lighting industry. In the mid-1990s, Japan's Nichia Chemical Corporation broke through the key technology of manufacturing blue LEDs, and thus developed a technology that uses blue LEDs to excite phosphors to recombine to produce white light sources. Compared with conventional light-emitting technologies such as incandescent or fluorescent lamps, LED solid-state lighting not only has the advantages of low voltage, high luminous efficiency, low energy consumption, long life, and no pollution, but also has high brightness, small size, fast response, less heat generation and reliable Sexual characteristics. At present, it has been successfully applied in the fields of semiconductor lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 刘荣辉刘元红周小芳何华强陈观通张书生庄卫东
Owner GRIREM ADVANCED MATERIALS CO LTD