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Phosphor powder, its preparation method and light-emitting device comprising it

A fluorescent powder and element technology, applied in the field of fluorescent powder, its preparation, and light-emitting devices, can solve the problems of affecting device performance and low relative brightness, and achieve the effects of improving luminous efficiency, low cost, and simple and easy preparation methods

Active Publication Date: 2017-08-25
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Phosphor powder, its preparation method and light-emitting device comprising it
  • Phosphor powder, its preparation method and light-emitting device comprising it

Examples

Experimental program
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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 5-20h, preferably 15-20h, to obtain a roasted product; then use Si oxides and / or Al oxides as raw materials for secondary mixing with the roasted product, and heat the secondary mixture at 1500-1700°C, preferably Heat treatment at 1600°C in nitrogen and / or hydrogen atmosphere for 0.5-2h, preferably 1-2h, to obtain the required fluorescent powder; wherein the amount of the above-mentioned raw materials is calculated according to the weight percentage of each element in the fluorescent powder of the present invention Amount, where the amount of nitride of Si matches the amount of oxide of Si so that in the prepared phosphor particles, it is within the range ...

Embodiment 1

[0052] Preparation:

[0053] Weigh 41.67g Sr 3 N 2 , 61.39g Si 3 N 4 and 0.61g of EuN, mixed evenly, and roasted at 1700°C for 15 hours in a mixed atmosphere of nitrogen and hydrogen to obtain a roasted product, lower the temperature below 100°C, take it out, and crush it to obtain roasted particles with an average particle size of 10 μm; The calcined particles were mixed with 0.1 g of SiO 2 Mix, keep warm at 1600°C for 1 hour under a nitrogen atmosphere, lower the temperature below 100°C, take it out, crush it to obtain an average particle size of 10 μm, wash with water, dry and pass through a 450-mesh sieve to obtain the desired fluorescence powder, the mass ratios of Sr element, Si element, N element, O element and Eu element in the phosphor powder to the phosphor powder mass ratio are respectively: 37.7%, 36.8%, 25.1%, 0.1% and 0.4%.

[0054] X-ray diffraction: eg figure 1 As shown, the phosphor is Sr when tested by X-ray diffraction instrument 2 Si 5 N 8 structur...

Embodiment 2-11

[0058] The phosphor powder preparation process in Examples 2-11 is basically the same as in Example 1, except that the alkaline earth metal nitrides, Si 3 N 4 , the amount of EuN is different, and the added SiO 2 and Al 2 o 3 The amount is different, and the amount of each raw material added is shown in Table 1. Through X-ray diffraction, the fluorescent powders prepared in Examples 2-11 in Table 1 are all Sr 2 Si 5 N 8 structure, and detected by the EDS device, the mass ratio and m value of each element in the phosphor powder prepared in Example 2-11 are shown in Table 2.

[0059] The quality of the raw material that adds in the embodiment 2-11 of table 1

[0060] Example Sr 3 N 2

Ca 3 N 2

Ba 3 N 2

Si 3 N 4

EuN SiO 2

2 41.54 0 0 61.40 0.66 0.40 3 41.45 0 0 61.43 0.66 0.60 4 41.29 0 0 61.50 0.66 1.00 5 42.95 0 0 54.02 4.68 0.20 6 49.72 0 0 49.73 0.59 0.70 7 41.35 0....

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Abstract

The invention discloses a fluorescent powder, a preparation method thereof and a light-emitting device comprising the same. The phosphor has a Sr2Si5N8 structure, and contains 32%-45% of alkaline earth metal elements, 25%-38% of Si elements, 22%-27% of N elements, 0.05-0.5% of O elements, 0%-0.5% Al element, 0.2%-13% Eu element, and in the phosphor particle, the weight percentage of Al element in any unit volume within the range of 0-50nm extending from the surface of the particle to the center of the particle The ratio between the sum of the content and the weight percentage of Si element and the weight percentage of Si element in any unit volume outside this range is m, and the value range of m is: 1.2≤m≤2.5. The phosphor powder provided by the present invention has higher luminous efficiency.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a fluorescent powder, 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 li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/50
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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