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Phosphor and preparation method thereof

A technology for phosphors and inorganic compounds, applied in the field of phosphors and their preparation, can solve the problems of high color temperature, damage to light-emitting devices, poor stability, etc., and achieve the effects of simple preparation method, convenient industrial production and easy operation

Active Publication Date: 2015-09-02
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] YAG yellow powder matched with blue LED chips to produce white light is widely used because of its high efficiency and simple production. However, due to the defects in the red region of its spectrum, the color rendering index is low and the color temperature is high, which makes it difficult to meet the needs of high-quality lighting. Therefore, it is the current development trend to obtain white light with high color rendering index by adding red powder or using blue light chips to match red and green phosphors.
However, the sulfide red powders reported by U.S. Patent No. 6,252,254 have poor stability, causing color drift or even damage to light-emitting devices during use; 2 Si 5 N 8 : Eu, CaAlSiN 3 The preparation conditions for the main representative nitride red powder are harsh

Method used

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  • Phosphor and preparation method thereof
  • Phosphor and preparation method thereof
  • Phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh SrCO 3 11.0353g, 8c 2 o 3 3.4478g, SrF 2 3.1404g, Eu 2 o 3 0.0440g, the above raw materials are all analytically pure. After the above raw materials are ground evenly, they are put into an alumina crucible and roasted in ammonia decomposition gas. The roasting temperature is 1350°C and kept for 6 hours. After sieving and other post-treatment, the chemical composition is Sr 1.995 8cO 3 F: Eu 0.005 Phosphor powder, its X-powder diffraction pattern (Co target, λ=0.178892nm) such as figure 2 As shown, the phosphor can be excited by blue light or ultraviolet light. Under the excitation of 450nm blue light, its emission spectrum can be seen in image 3 , it can be seen from the figure that the main emission peak is around 610nm, and the luminous intensity is shown in Table 3.

Embodiment 2-3

[0040] The preparation of Example 2-3 is to weigh the raw materials according to the chemical composition and stoichiometric ratio of Example 2-3 in the table, and prepare the corresponding fluorescent powder according to the method of Example 1. The chemical formula and relative luminous intensity of the obtained fluorescent powder are shown in the table 3.

Embodiment 4

[0042] Weigh SrCO 39.5959g, Sc 2 o 3 2.7582g, Gd 2 o 3 1.8125g, SrF 2 3.7685g, Eu 2 o 3 0.8798g, the above raw materials are all analytically pure. After the above raw materials are ground evenly, they are put into an alumina crucible and roasted twice under the condition of adding carbon powder. The first roasting temperature is 1320 ° C for 4 hours, and the roasting The product is crushed and ground for secondary roasting, and the roasting temperature is 1300° C. for 8 hours. The chemical composition of the roasted product is Sr 1.8 sc 0.8 Gd 0.2 o 2.8 f 1.2 : Eu 0.1 The main emission peak of the fluorescent powder is located at about 612nm when excited at 450nm, and the luminous intensity is shown in Table 3.

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Abstract

The invention discloses a phosphor and a preparation method thereof. The phosphor includes an inorganic compound which is prepared from elements M<1>, M<2>, M<3> and O and F, wherein the M<1> element is one or two selected from Ba, Sr, Ca, Mg and Zn, and must contain Sr; the M<2> element is one or two selected from Sc, Al, Ga, Y, La, Gd and Lu, and must contain Sc; the M<3> element is one or two selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and must contain Eu; and the inorganic compound has the same crystal structure as Sr2ScO3F. The preparation method includes: taking compounds corresponding to the M<1>, M<2>, M<3> and F as raw materials; grinding the raw materials fine, mixing the raw materials uniformly, under a reducing atmosphere, placing the raw materials in a high temperature sintering furnace at the temperature of 1100-1500 DEG C and sintering for 0.5-20h, and obtaining the phosphor through crushing, grinding and post-classification treatment. The phosphor of the present invention has the characteristics of high efficiency, uniformity and non-impurity phase, and the preparation method is simple and facilitates industrialization.

Description

technical field [0001] The invention relates to a fluorescent powder capable of being effectively excited by ultraviolet or blue light to emit red light and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] Luminescent materials have been widely used in the fields of laser, lighting, display and optoelectronics, and play an irreplaceable role in the national economy and people's daily life. Among them, photoluminescent inorganic fluorescent materials doped with rare earth elements are the most active type in the research and application of luminescent materials. In recent years, light-emitting diodes (LEDs) have been widely used in the field of solid-state lighting for their advantages of energy saving, environmental protection, and long life, which cannot be compared with traditional lighting fixtures such as incandescent lamps and fluorescent lamps. [0003] YAG yellow powder matched with blue LED chips ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 庄卫东钟继有徐会兵刘荣辉刘元红胡运生何华强
Owner GRIREM ADVANCED MATERIALS CO LTD
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