Orange red fluorescent powder for LED and preparation method thereof

A fluorescent powder and orange-red technology, applied in the field of rare earth luminescent materials, can solve the problems of poor color rendering, low efficiency, and unstable performance, and achieve stable physical and chemical properties, high energy conversion efficiency, and simple synthesis methods Effect

Active Publication Date: 2011-05-25
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue LED chips and yellow light of YAG phosphor powder. As a result, the color rendering is not good, and red phosphor can be added to obtain a high color rendering index
However, in the prior art, som...

Method used

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  • Orange red fluorescent powder for LED and preparation method thereof
  • Orange red fluorescent powder for LED and preparation method thereof
  • Orange red fluorescent powder for LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Weighing SrCO 3 9.1287g, GeO 2 3.3175g, Sm 2 o 3 0.2764g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1150°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 2 GeO 4 : 0.05Sm 3+ sample. Its emission spectrum see Figure 1~Figure 3 . The main emission peak is 597 nm. Its excitation spectrum see Figure 4 . It can be seen from the figure that the phosphor can be effectively excited by ultraviolet or purple light in the range of 340 nm to 420 nm, and has a wide range of uses.

Embodiment 2

[0021] Embodiment 2: Weighing SrCO 3 10.3424g, Ge(CO 3 ) 2 4.5899g, Sm 2 (CO 3 ) 3 0.3435g, the above raw materials are all analytically pure. After mixing and grinding the weighed raw materials evenly, put them into an alumina crucible and roast them twice in the air. Secondary roasting, heat preservation at 1050°C for 2 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 3 GeO 5 : 0.06Sm 3+ sample.

Embodiment 3

[0022] Embodiment 3: Weighing Sr(NO 3 ) 2 9.7594g, Ge(C 2 o 4 ) 2 11.8204g, Sm 2 o 3 0.2486g, and H 3 BO 3 0.3g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1050°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of SrGeO 3 : 0.03Sm 3+ sample.

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Abstract

The invention discloses orange red fluorescent powder for an LED (Light Emitting Diode), which is germanate fluorescent powder activated by trivalent samarium. The chemical expression of the fluorescent powder is (Ma-xSmx) GebOc, wherein the M is at least one of Li, Na, K, Mg, Ca, Sr, Ba and Zn; the a is more than 0 and less than or equal to 6; the b is more than or equal to 1 and less than or equal to 11; the c is more than or equal to 3 and less than or equal to 25; and the x is more than 0 and less than 0.3. The preparation method comprises the following steps of: uniformly grinding and mixing simple substances and compounds of M, Ge and Sm or the corresponding salts, then roasting at high temperature, and preparing the fluorescent powder after crushing, cleaning to eliminate impurities and baking. The fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency, stability and the like, and has the advantages of simple preparation method, no pollution and low cost. The fluorescent powder can be used for a purple light or ultraviolet light LED chip to manufacture a white light LED.

Description

technical field [0001] The invention relates to a germanate orange-red fluorescent powder and a preparation method thereof, in particular to an orange-red fluorescent powder suitable for LEDs and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] In the 1990s, with the technological breakthrough of high-brightness GaN blue LEDs, in 1996, blue LEDs and YAG phosphors ((Y, Gd) appeared. 3 Al 5 o 12 : Ce 3+ ) combined white light LED, which is considered to be another leap in the history of human lighting after incandescent lamps and fluorescent lamps, and is one of the most promising high-tech fields in the 21st century. There are three ways to produce white light with phosphor: blue LED chip with yellow phosphor; blue LED chip with red and green phosphor; UV-LED chip with red, green and blue phosphors. At present, the commercial products are mainly single-chip high-brightness white LEDs compos...

Claims

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Application Information

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IPC IPC(8): C09K11/66H01L33/50
Inventor 徐时清黄立辉华有杰邓德刚赵士龙王焕平夹国华
Owner CHINA JILIANG UNIV
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