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Red fluorescent powder for light-emitting diode (LED) and preparation method for red fluorescent powder

A red phosphor powder and phosphor technology are applied in the field of red phosphor powder and its preparation, red phosphor powder of LED and its preparation field, and can solve the problems of low color rendering index, low efficiency and unstable performance of white light LED. Achieve the effects of stable physical and chemical properties, high energy conversion efficiency and simple synthesis method

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

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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  • Red fluorescent powder for light-emitting diode (LED) and preparation method for red fluorescent powder
  • Red fluorescent powder for light-emitting diode (LED) and preparation method for red fluorescent powder
  • Red fluorescent powder for light-emitting diode (LED) and preparation method for red fluorescent powder

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: Weighing CaCO 3 3.5821g, TeO 2 7.1393g, Li 2 CO 3 0.1652g, Eu 2 o 3 0.7871g, 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 0.8 Li 0.1 TeO 3 : 0.1Eu 3+ The LED uses red phosphor, its emission spectrum under the light excitation of 393 nm, 465 nm, and 382 nm is shown in Figure 1~Figure 3 , the main emission peak is 614 nm. The excitation spectrum obtained by monitoring the 614 nm emission is shown in Figure 4 , it can be seen from the figure that the phosphor can be effectively excited by ultraviolet, purple or blue light in the range of 350 nm to 480 nm, and has a wide range of uses.

Embodiment 2

[0022] Embodiment 2: Weighing CaCO 3 4.5284g, TeO 2 7.3675g, Na 2 CO 3 0.0245g, Eu 2 o 3 0.0812g, 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 750°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 0.98 Na 0.01 TeO 3 : 0.01Eu 3+ LEDs use red phosphor.

Embodiment 3

[0023] Embodiment 3: Weighing CaC 2 o 4 1.0363g, TeO 2 6.4569g, Li 2 CO 3 0.598g, Eu(NO 3 ) 3 5.4695g, 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. The first time is kept at 600°C for 2 hours. Secondary roasting, heat preservation 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 0.2 Li 0.4 TeO 3 : 0.4Eu 3+ LEDs use red phosphor.

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Abstract

The invention discloses red fluorescent powder for a light-emitting diode (LED). The red fluorescent powder is trivalent europium activated calcium tellurate fluorescent powder, and has the chemical expression formula of (Ca1-2xEuxAx)TeO3, wherein A refers to at least one of Li, Na and K; and x is more than 0 and less than 0.5. The invention discloses a preparation method for the red fluorescent powder. The preparation method comprises the following steps: uniformly mixing and grinding simple substances, compounds or corresponding salts of Ca, Te and Eu and compounds or corresponding salts of A, roasting at high temperature, crushing, cleaning to remove impurities, drying and processing. The fluorescent powder has the characteristics of wide wavelength exciting range, high efficiency, stability and the like; and the preparation method is simple, pollution-free and low in cost. The fluorescent powder can be widely applied to purple, ultraviolet or blue light-emitting diode (LED) chips for manufacturing white LEDs.

Description

technical field [0001] The invention relates to a red fluorescent powder and a preparation method thereof, in particular to a 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. At present, there are three main ways to realize white LED: multi-color LED combination method, phosphor coating light conversion method and multiple quantum well method. The multi-color LED combination method has high luminous brightness, but the driving circuit is complicated, the cost is high, and ...

Claims

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Application Information

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IPC IPC(8): C09K11/88
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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