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Orange red fluorescent powder for LED (Light Emitting Diode) 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: 2012-09-26
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, some phosphors used for white LEDs lack red light components, or the red phosphors have low luminous efficiency or are unstable, such as several sulfide red phosphors reported in US Patent US6252254
The white LEDs packaged in the prior art have low color rendering index or low efficiency or unstable performance

Method used

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  • Orange red fluorescent powder for LED (Light Emitting Diode) and preparation method thereof
  • Orange red fluorescent powder for LED (Light Emitting Diode) and preparation method thereof
  • Orange red fluorescent powder for LED (Light Emitting Diode) and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: Weighing CaCO 3 4.5321g, TeO 2 7.3736g, Li 2 CO 3 0.0171, Sm 2 o 3 0.0806g, 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 650°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 Ca 0.98 Li 0.01 TeO 3 : 0.01Sm 3+ orange-red phosphors for LEDs. Its emission spectra at 405 nm and 375 nm light excitation are shown in figure 1 with figure 2 , the main emission peak is 602 nm. The excitation spectrum obtained by monitoring the 602 nm emission is shown in image 3 . 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

[0020] Embodiment 2: Weighing CaC 2 o 4 11.0646g, TeO 2 4.7867g, Na 2 C 2 o 4 0.1206g, Sm 2 o 3 0.3138g, 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 700°C for 1 hour. 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 Ca 2.88 Na 0.06 TeO 6 : 0.06Sm 3+ orange-red phosphors for LEDs.

Embodiment 3

[0021] Embodiment 3: Weighing Sr(NO 3 ) 2 7.5711g, TeO 2 6.0758g, Li 2 CO 3 0.0423g, Sm(NO 3 ) 3 0.3841g, 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 700°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 0.94 Li 0.03 TeO 4 : 0.03Sm 3+ orange-red phosphors for LEDs.

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Abstract

The invention discloses orange red fluorescent powder for an LED (Light Emitting Diode), which is tervalent samarium activated tellurate fluorescent powder and has a chemical formula of (Ma-2xSmxAx)TebOc, wherein M is at least one of Ca, Sr and Ba; A is at least one of Li, Na and K; a is more than or equal to 1 but less than or equal to 3; b is more than or equal to 1 but less than or equal to 4; c is more than or equal to 3 but less than or equal to 11; and x is more than 0 but less than 0.1. The invention also discloses a preparation method for the compound, which comprises the following steps of: uniformly milling and mixing monomers, compounds or corresponding salts of M, Te and Sm and the compounds or corresponding salts of A; roasting at high temperature; and smashing, cleaning, removing impurities, and drying, and then processing, thereby obtaining the orange red fluorescent powder for the LED. The orange red fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency, stability, and the like; the preparation method is simple; no pollution is caused; the cost is low; and the orange red fluorescent powder can be used for manufacturing a white light LED by using a purple light or ultraviolet light LED chip.

Description

technical field [0001] The invention relates to an 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 composed of blu...

Claims

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Application Information

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IPC IPC(8): C09K11/88H01L33/50
CPCY02B20/181Y02B20/00
Inventor 黄立辉徐时清华有杰邓德刚赵士龙王焕平夹国华
Owner CHINA JILIANG UNIV
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