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Green fluorescent powder as well as preparation method and application thereof in white-light LED device

A green phosphor, calcining technology, applied in semiconductor devices, chemical instruments and methods, electrical components, etc., can solve problems such as low color rendering index, and achieve the effects of simple operation, short synthesis time, and low equipment requirements

Inactive Publication Date: 2018-09-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of green fluorescent powder, the obtained green fluorescent powder can absorb blue light effectively, after it is mixed with red fluorescent powder and packaged with blue light chip, can obtain the white light LED of high color rendering index, thus solve the problem of traditional The defect of low color rendering index Ra of white LED

Method used

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  • Green fluorescent powder as well as preparation method and application thereof in white-light LED device
  • Green fluorescent powder as well as preparation method and application thereof in white-light LED device
  • Green fluorescent powder as well as preparation method and application thereof in white-light LED device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Table 1 The raw material composition of the green fluorescent powder of Example 1

[0031] raw material

CaCO 3

sc 2 o 3

CeO 2

Mass / g

0.3333

0.4664

0.0006

[0032] The mass ratio of the corresponding elements of the raw materials is Ca:Sc:Ce=0.999:2:0.001, and the corresponding mass is shown in Table 1. The raw materials accurately weighed according to Table 1 were ground evenly in an agate mortar, then transferred to a molybdenum crucible, and then heated to 400 °C in a muffle furnace, kept for 3 h, and then cooled naturally. After taking out the sample, put it into an agate mortar, fully grind it to powder, then put it into a molybdenum crucible, heat it to 1500 ℃ in a muffle furnace filled with carbon block, keep it warm for 6 hours, then cool it naturally, take it out, grind it and then carry out the follow-up test. The X-ray diffraction pattern of the green fluorescent powder is attached figure 1 shown, with the s...

Embodiment 2

[0038] Table 3 The raw material composition of embodiment 2 green fluorescent powder

[0039] raw material

CaCO 3

sc 2 o 3

CeO 2

Mass / g

0.3320

0.4664

0.0029

[0040] The mass ratio of the corresponding elements of the raw materials is Ca:Sc:Ce=0.995:2:0.005, and the corresponding mass is shown in Table 3. The raw materials accurately weighed according to Table 3 were ground evenly in an agate mortar, then transferred to a molybdenum crucible, and then heated to 400 °C in a muffle furnace, kept for 3 h, and then cooled naturally. After taking out the sample, put it into an agate mortar, fully grind it to powder, then put it into a molybdenum crucible, heat it to 1500 ℃ in a muffle furnace filled with carbon block, keep it warm for 6 hours, then cool it naturally, take it out, grind it and then carry out the follow-up test. The X-ray diffraction pattern of the green phosphor is as follows figure 1 shown, with the standard card...

Embodiment 3

[0043] Table 4 The raw material composition of embodiment 3 green fluorescent powder

[0044] raw material

[0045] The mass ratio of the corresponding elements of the raw materials is Ca:Sc:Ce=0.99:2:0.01, and the corresponding mass is shown in Table 4. The raw materials accurately weighed according to Table 4 were ground evenly in an agate mortar, then transferred to a molybdenum crucible, and then heated to 400 °C in a muffle furnace, kept for 3 h, and then cooled naturally. After taking out the sample, put it into an agate mortar, fully grind it to powder, then put it into a molybdenum crucible, heat it to 1500 ℃ in a muffle furnace filled with carbon block, keep it warm for 6 hours, then cool it naturally, take it out, grind it and then carry out the follow-up test. The X-ray diffraction pattern of the green phosphor is as followsfigure 1 shown, with the standard card JCPDS 72-1360 (CaSc 2 o 4 ) are completely consistent with each other, which indicates that ...

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Abstract

The invention discloses green fluorescent powder. The chemical formula of the green fluorescent powder is Ca1-xSc2O4: xCe3+, wherein x is greater than or equal to 0.001 and less than or equal to 0.90,and x is a molar percent coefficient of Ce3+ relative to Ca. The invention also provides a preparation method of the green fluorescent powder. The preparation method comprises the following steps: uniformly mixing CaCO3, Sc2O3 and CeO2 according to a ratio, calcining the mixture in an air atmosphere, cooling, and forming the fluorescent powder A; and then grinding the fluorescent powder A and co-solvent, and calcining in a reduction atmosphere, thus obtaining the green fluorescent powder. Raw materials in the invention are nontoxic and easy to obtain; and by adopting the high-temperature solid-phase reaction, the operation is simple, and the synthetic time is short. The obtained green fluorescent powder can effectively absorb blue light, and after the green fluorescent powder is mixed with red fluorescent powder, the mixture is packaged with a blue chip, so that a white-light LED with high developing index can be obtained.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a green fluorescent powder, its preparation method and its application in white light LED devices. Background technique [0002] At present, the market share of fluorescent conversion white light-emitting diodes based on InGaN LED chips and phosphor packaging in the lighting market is gradually increasing. This technology requires that the phosphors we prepare must have the ability to absorb blue light and near-ultraviolet light, so that Can be well combined with InGaN LED chips. Researchers have proposed a variety of phosphors that can be excited by InGaN LED chips, such as oxides, sulfides, nitrides, etc. The most widely used fluorescent conversion white LEDs on the market today are composed of InGaN blue chips and Y 3 A l5 o 12 : Ce 3+ Prepared in combination with yellow phosphor. However, the white light produced by mixing the incompletely absorbed blue light of the ...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7769H01L33/502
Inventor 黄霖张鸽王静
Owner SUN YAT SEN UNIV