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A kind of preparation method and application of blue fluorescent powder for warm white LED

A technology of blue phosphor and warm white light, which is applied in the field of phosphor for near-ultraviolet light excitation, can solve the problems of poor light quality and low color rendering index, and achieve the effects of good stability, simple preparation process and high intensity

Inactive Publication Date: 2017-03-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this white LED has the disadvantages of low color rendering index and poor light quality.

Method used

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  • A kind of preparation method and application of blue fluorescent powder for warm white LED
  • A kind of preparation method and application of blue fluorescent powder for warm white LED
  • A kind of preparation method and application of blue fluorescent powder for warm white LED

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of preparation method for the blue fluorescent powder of warm white light LED, the chemical formula of described blue fluorescent powder is β-NaSr 0.95 BO 3 :0.05Ce 3+ , its preparation method comprises the following steps:

[0022] 1) Analytical pure Na 2 CO 3 , SrCO 3 、H 3 BO 3 and CeO with a purity of 99.99% 2 Put into an agate mortar and grind fully to obtain a mixed powder, the molar ratio of each element in the mixed powder is Na:Sr:B:Ce=3:0.95:1.03:0.05;

[0023] 2) Transfer the above mixed powder into a corundum crucible and put it into a muffle furnace for pre-firing. The pre-fired temperature is 600°C, and the pre-fired time is 24h. After cooling to room temperature naturally, grind it again in an agate mortar , to obtain the pre-burned mixed powder;

[0024] 3) Transfer the above-mentioned pre-fired mixture to a corundum crucible and put it into a muffle furnace for calcination. The calcination temperature is 800° C., and the calcination time ...

Embodiment 2

[0032] A kind of preparation method for the blue fluorescent powder of warm white light LED, the chemical formula of described blue fluorescent powder is β-NaSr 0.99 BO 3 :0.01Ce 3+, the preparation steps are basically the same as in Example 1, except that the molar ratio of each element in the mixed powder in step 1) is Na:Sr:B:Ce=3:0.99:1.03:0.01.

[0033] The XRD pattern of the prepared blue phosphor is as follows figure 1 As shown, the excitation emission spectrum is similar to that of Example 1.

Embodiment 3

[0035] A kind of preparation method for the blue fluorescent powder of warm white light LED, the chemical formula of described blue fluorescent powder is β-NaSr 0.97 BO 3 :0.03Ce 3+ , the preparation steps are basically the same as in Example 1, except that the molar ratio of each element in the mixed powder in step 1) is Na:Sr:B:Ce=3:0.97:1.03:0.03.

[0036] The XRD pattern of the prepared blue phosphor is as follows figure 1 As shown, the excitation emission spectrum is similar to that of Example 1.

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Abstract

The invention provides a preparing method of blue fluorescent powder for a warm white light LED. The chemical formula of the blue fluorescent powder is beta-NaSr1-xBO3:xCe3+, wherein the x ranges from 0.01 to 0.09. The preparing method includes the steps that oxides of sodium, strontium salt, boric acid and europium serve as raw materials; the raw materials are weighed according to the stoichiometric ratio, fully ground and placed into a muffle furnace to be subjected to low-temperature primary presintering, high-temperature secondary calcining and third reduction sintering and then subjected to postprocessing, and a final product, namely the inorganic borate blue fluorescent powder is obtained. According to application of the prepared blue fluorescent powder for the warm white light LED, low-temperature white fluorescent can be achieved by mixing the blue fluorescent powder with red fluorescent powder and green fluorescent powder under the excitation of ultraviolet light to be used for lighting of the warm white light LED. The preparing method and application of the blue fluorescent powder for the warm white light LED have the advantages that the blue fluorescent powder has a wide excitation and emission waveband, is good in color purity, low in cost, simple in manufacturing process and capable of being applied to large-power LED chips and represents excellent performance, and the raw materials are easy to obtain.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for near-ultraviolet light excitation, in particular to a preparation method and application of a blue fluorescent powder for warm white LEDs. Background technique [0002] Due to its high efficiency, long life, fast response, high safety, and environmental protection, white LED plays an important role in the solid-state lighting industry, and it is likely to replace incandescent lamps and fluorescent lamps as the next-generation lighting source, which has attracted people's attention. Widespread concern. With Japan's Nichia Chemical Company manufacturing the world's first white light diode in 1997, the development of lighting technology entered the third generation. This white light diode is composed of a blue LED chip and YAG:Ce phosphor. The YAG:Ce phosphor emits yellow light under the blue light excitation of the blue LED, and the yellow light is mixed with the blue light emitted b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/63H01L33/50
CPCY02B20/00
Inventor 易欢武莉张毅
Owner NANKAI UNIV