Nitride fluorescent powder and preparation method thereof, light-emitting device comprising nitride fluorescent powder

A technology of nitride phosphors and phosphors, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems affecting device performance and low relative brightness, and achieve improved luminous efficiency, low cost, and simple preparation methods easy effect

Active Publication Date: 2013-09-25
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a new representative Sr 2 Si 5 N 8 Structured nitride phosphor, its matrix has a tight network structure and relatively low brightness, which affects the performance of the device during LED use

Method used

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  • Nitride fluorescent powder and preparation method thereof, light-emitting device comprising nitride fluorescent powder
  • Nitride fluorescent powder and preparation method thereof, light-emitting device comprising nitride fluorescent powder
  • Nitride fluorescent powder and preparation method thereof, light-emitting device comprising nitride fluorescent powder

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preparation example Construction

[0033] Preferably, the above-mentioned preparation method includes the following steps: firstly, the nitrides of alkaline earth metals, Si and Eu are used as raw materials for primary mixing, and the primary mixture is heated at 1500-1800°C, preferably 1600-1700°C, under nitrogen and / or hydrogen atmosphere Medium roasting for 5-10h, preferably 6-10h, to obtain a roasted product; then use Si oxides and / or Al oxides as raw materials to perform secondary mixing with the roasted product, and place the secondary mixture at 1500-1800°C under nitrogen And / or heat treatment in a hydrogen atmosphere for 0.5-2h, preferably 1-2h, to obtain the required nitride phosphor; wherein the amount of the above-mentioned raw materials is weighed according to the weight percentage of each element in the nitride phosphor of the present invention , wherein the amount of Si nitride, Si oxide, and Al Al oxide is matched so that in the prepared nitride phosphor particles, the range of 0-50nm extending fr...

Embodiment 1

[0052] Preparation:

[0053] Accurately weigh 51.81gSr 3 N 2 , 22.14gAlN, 25.19gSi 3 N 4 and 0.9gEuN, after mixing evenly, roasted at 1600°C for 10h in a mixed atmosphere of nitrogen and hydrogen to obtain a roasted product, lower the temperature to below 100°C, take it out, and crush it to obtain roasted particles with an average particle size of 10μm; The above-mentioned calcined particles were mixed with 0.4g of Al 2 o 3 And mix evenly, in a nitrogen atmosphere, keep warm at 1500°C for 2 hours, then lower the temperature to below 100°C, take it out, crush it to obtain particles with an average particle size of 10 μm, wash with water, dry and pass through a 450-mesh sieve, Obtain required fluorescent powder, the mass ratio of Sr element, Al element, Si element, N element, O element and Eu element in fluorescent powder and phosphor powder mass ratio is respectively: 46.6%, 14.7%, 15.1%, 22.6%, 0.2 % and 0.8%.

[0054] X-ray diffraction: eg figure 1 As shown, the nitri...

Embodiment 2-4

[0058] The phosphor powder preparation process in embodiment 2-4 is basically the same as embodiment 1, only the added Al 2 o 3 The amount is different, the amount added is 0.1g, 0.7g and 1g respectively. The mass ratio and m value of each element in the prepared phosphor are shown in Table 2.

[0059] The mass ratio composition, relative brightness and m value of Table 1 embodiment 1-4 phosphor

[0060]

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Abstract

The invention discloses a nitride fluorescent powder and a preparation method thereof, a light-emitting device comprising the nitride fluorescent powder. The nitride fluorescent powder is a CaAlSiN3 structure, and comprises the following components in percentage by weight: 32-48% of alkali earth metal, 9-34% of Si, 10-25% of N, 0.1-0.8% of O, 13-26% of Al and 0.2-8% of Eu. The ratio of the sum of weight percents of Al and Si in any unit volume within the 0-50nm range from particle surface to the particle center to the weight percent of Si in any unit volume beyond the range is m, and 1.5<=m<=5. The nitride fluorescent powder disclosed by the invention has higher light-emitting efficiency.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a nitride phosphor, a preparation method thereof and a luminescent device comprising the same. Background technique [0002] As a new type of solid-state light source, white LED has been widely used in the field of lighting and display due to its advantages of high light efficiency, low energy consumption, long life, and no pollution. At present, the realization method of white light LED is mainly based on a single blue light / ultraviolet chip composite phosphor, which is simple, easy to implement and relatively cheap. In the realization process of white LED, red fluorescent substance is indispensable as an important part of the three primary colors of red, green and blue. 3+ In addition to the lack of red in ", it can also produce white light with blue LEDs and green phosphors, or with green and blue fluorescent substances and purple or ultraviolet LEDs to produce white ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
Inventor 刘荣辉刘元红徐会兵何华强高慰何涛陈观通夏天
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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