A kind of white light fluorescent powder excited by ultraviolet LED and preparation method thereof

A fluorescent powder and white light technology, applied in the field of white light fluorescent powder, can solve the problems of poor thermal stability, low luminous efficiency of phosphors, inconsistent light decay, etc., and achieve short sintering time, high luminous intensity, good particle shape and uniformity Effect

Active Publication Date: 2019-04-23
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a white light phosphor excited by ultraviolet LEDs, so as to solve the problems of low luminous efficiency, poor thermal stability and inconsistent light decay of the phosphors used in existing white light LEDs

Method used

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  • A kind of white light fluorescent powder excited by ultraviolet LED and preparation method thereof
  • A kind of white light fluorescent powder excited by ultraviolet LED and preparation method thereof
  • A kind of white light fluorescent powder excited by ultraviolet LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) According to the chemical formula Sr 0.6 Ca 0.25 SM 0.04 Tb 0.06 T m 0.05 AlSiN 2.9 o 0.225 The stoichiometric ratio was weighed 0.02molSr 3 N 2 , 0.0083mol Ca 3 N 2 , 0.1mol AlN, 0.033mol Si 3 N 4 、0.002mol Sm 2 o 3 , 0.0015molTb 4 o 7 , 0.0025mol Tm 2 o 3 , the purity of the raw materials is 99.99%, and the particle size of the raw materials is 3-5 μm;

[0035] Note: All the above raw materials were weighed in the glove box N 2 Under the atmosphere

[0036] (2) Weighing by NH 4 Cl, NaF, H 3 BO 3 Composed mixed flux, the total mass of the mixed flux is 4% of the total mass of raw materials taken in step (1), and the mass ratio of the three is NH 4 Cl:NaF:H 3 BO 3 =2:3:2;

[0037] (3) All the raw materials and fluxes taken in steps (1) and (2) are placed in N 2Grind in an agate mortar for more than 40 minutes under the atmosphere to make it evenly mixed, then transfer the raw materials to the molybdenum crucible and cover the crucible lid, ...

Embodiment 2-11

[0045] The doping amounts of Sm, Tb, and Tm elements were changed (see Table 1 for details), and other process conditions were the same as in Example 1. The relevant test results obtained were compared with those of Example 1 and Comparative Example 1, as shown in Table 1.

[0046] Table 1:

[0047]

[0048]

[0049] It can be seen from Table 1 that the relative brightness of the embodiment of the present invention is obviously better than that of comparative example 1, and the color coordinates are closer to the pure white light color coordinates (0.33, 0.33).

[0050] Choose embodiment 1, embodiment 11 and comparative example 1 obtained fluorescent powder to carry out temperature quenching test, detection temperature rises to 500K from 300K, it is detected once every time the temperature changes by 50K, record results are shown in table 2, simultaneously The curves of the three samples with the change of temperature are drawn as follows: Figure 4 shown.

[0051] Tab...

Embodiment 12-19

[0059] Change the amount of addition of flux and change the ratio of each component in the flux (see Table 4 for details), other process conditions and raw material ratios are all the same as in Example 1, and the relevant test results obtained are compared with Example 1 and Comparative Example 1 , as shown in Table 4.

[0060] Table 4:

[0061]

[0062] As can be seen from Table 4, the relative brightness of the fluorescent powder obtained in Comparative Example 1 is low, the particles are large, and need to be crushed, and the yield of the finished product is also low. It can be seen from Examples 12-13 and Examples 18-19 that a small amount or excessive amount of auxiliary powder is added. Flux makes the phosphor particles smaller or larger, which is not conducive to encapsulation, and the yield is not ideal; when the amount of flux added is 4%, NH 4 Cl:NaF:H 3 BO 3 When =2:3:2, the overall performance of the phosphor obtained is the best, and the phosphor powder pre...

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Abstract

The invention discloses ultraviolet LED excited white fluorescent powder and a preparation method thereof. The chemical general formula of the fluorescent powder is M(1-x-y-z)SmxTbyTmzAlSiN3-2(x+y+z) / 3O3(x+y+z) / 2, wherein M is at least one of Ca, Sr and Ba, and x is greater than or equal to 0.001 but less than 0.2, y is greater than or equal to 0.001 but less than or equal to 0.1 and Z is greater than or equal to 0.001 but less than or equal to 0.2. The white fluorescent powder disclosed by the invention can be excited by an ultraviolet LED which is relatively short in wavelength. The preparation method comprises the following steps of: weighing raw materials and a fluxing agent in a molar ratio of elements in the chemical general formula; and preparing the fluorescent powder which emits white light in a single matrix by means of a sectional high-temperature solid phase calcining method. Defects caused by mixing and blending the fluorescent powder are overcome. The white fluorescent powder disclosed by the invention is good in light-emitting spectral continuity, high in color developing property, consistent in photochromic attenuation and good in stability, the product yield is relatively high, and the fluorescent powder can be widely applied to occasions such as plant growth illumination, an LED supplement light of a mobile phone and photostudio decoration.

Description

technical field [0001] The invention relates to a white light phosphor, in particular to a white light phosphor excited by an ultraviolet LED and a preparation method thereof. Background technique [0002] In recent years, with the gradual improvement of the luminous efficiency and the gradual decline of the cost of light-emitting diodes (Light Emitting Diode, LED), semiconductor lighting has gradually become the development trend of modern lighting. The fourth generation of lighting electric light source, known as "21st century green light source". [0003] At present, there are three main methods for preparing white light LEDs. The first is to use LED red, green and blue chips to combine to obtain white light; the second is to use LED blue light chips to excite yellow phosphor powder or LED blue light chips to simultaneously excite red phosphor powder and green fluorescence. powder to synthesize white light; the third is to use ultraviolet LED chips to excite RGB phosphor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCC09K11/7774
Inventor 杨志平魏东赵金鑫
Owner HEBEI LIFU CHEM TECH
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