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Single ion doped white phosphor applied to WLED device and preparation method thereof

A phosphor and single-ion technology, which is applied in the field of new single-ion activated white phosphor and its preparation, can solve the problems of poor chemical stability, low fluorescence efficiency, harsh synthesis conditions, etc., and achieve color stability and high luminous intensity. Effect

Active Publication Date: 2019-02-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently reported white phosphors have many problems, such as relatively poor chemical stability, low fluorescence efficiency, relatively harsh synthesis conditions, etc.

Method used

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  • Single ion doped white phosphor applied to WLED device and preparation method thereof
  • Single ion doped white phosphor applied to WLED device and preparation method thereof
  • Single ion doped white phosphor applied to WLED device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh barium carbonate (BaCO 3 ) 0.5811 g, Tan oxide (Ta 2 o 5 ) 0.4487 g, europium oxide (Eu 2 o 3 ) 0.01786 g, zinc oxide (ZnO) 0.0826 g. Grind the above raw materials in an agate mortar, put them into a corundum crucible after grinding evenly, and carry out the first step of sintering in an air atmosphere at 800 ° C. The constant temperature time is 10 h. After the end, the grinding was taken out, and then the second step of sintering was carried out in an air atmosphere at 1100 °C, and the constant temperature time was 10 h. After the end, the grinding was taken out, and the third step of sintering was carried out again at 1100 ° C, and the constant temperature time was 10 h. After the third step is finished, wait for it to cool naturally, grind evenly and obtain the product. Product X-ray powder diffraction results such as figure 1 shown. The Rietveld refinement (Fig. 2) further shows that the preparation scheme of multi-step sintering will not affect the ph...

Embodiment 2

[0030] Weigh calcium carbonate (SrCO 3 ) 0.5093 g, Tan oxide (Ta 2 o 5 ) 0.5257 g, europium oxide (Eu 2 o 3 ) 0.0209 g, zinc oxide (ZnO) 0.0968 g, the above raw materials were ground in an agate mortar, and put into a corundum crucible after grinding evenly, and the first step of sintering was carried out in a reducing atmosphere at 800 °C, and the constant temperature time was 10 h. After the end, it was taken out for grinding, and then the second step of sintering was carried out in an air atmosphere at 1100 °C, and the constant temperature time was 10 h. After the end, the grinding was taken out, and the third step of sintering was carried out again at 1100 °C, and the constant temperature time was 10 h. After the third step is finished, wait for it to cool naturally, grind evenly and obtain the product. All diffraction peaks are basically the same as those in the standard peak card (PDF# 17-0177), indicating that the introduction of europium ions will not significantl...

Embodiment 3

[0032] Weigh strontium carbonate (SrCO 3 ) 0.6282 g, niobium oxide ((Nb 2 o 5 ) 0.4039 g, europium oxide (Eu 2 o 3 ) 0.0267g, zinc oxide (ZnO) 0.1237g. Grind the above raw materials in an agate mortar, put them into a corundum crucible after grinding evenly, and carry out the first step of sintering in an air atmosphere at 800 °C, and the constant temperature time is 10 h. After the end, it was taken out for grinding, and then the second step of sintering was carried out in an air atmosphere at 1100 °C, and the constant temperature time was 10 h. After the end, the grinding was taken out, and the third step of sintering was carried out again at 1100 °C, and the constant temperature time was 10 h. After the third step is finished, wait for it to cool naturally, grind evenly and obtain the product. Product X-ray powder diffraction results such as figure 1 shown. like figure 1 As shown in the middle spectrum line 1, all the diffraction peaks can correspond to the standard...

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Abstract

The invention discloses single ion doped white phosphor applied to a WLED device and a preparation method thereof. The single ion doped white phosphor has a chemical formula of A3B'B''2O9: xRE<3+>, Ais alkaline earth metal, B' is low-valent transition metal, and B'' is a high-valent transition metal; x is a doped ion molar ratio coefficient, and the value range x is greater than or equal to 0.001and less than or equal to 0.999; RE<3+> is the trivalent doped ion selected from the group consisting of Sm<3+>, Tm<3+>, Eu<3+>, Ga<3+>, La<3+>, Sc<3+>, and Y<3+>. The white phosphor used for WLED ofthe invention seeks out the novel single-substrate white phosphor doped with the single trivalent ion under the premise of ensuring structural characteristics. The obtained material has a high luminous intensity of warm white light, and has broad emission (400 nm to 850 nm) and high color rendering property and good color stability.

Description

[0001] technical field [0002] The invention relates to a novel single-ion activated white fluorescent powder used in WLED devices and a preparation method thereof. Background technique [0003] In recent years, white LEDs have attracted great research interest due to their environmental friendliness, low energy consumption, high luminous efficiency, and long fluorescence lifetime. So far, the realization of white light is mainly divided into the following two ways. The first typical commercial white light LED is mainly through the visible light chip and YAG: Ce 3+ The yellow phosphor combination uses the blue light of the chip and the yellow light produced by YAG to partially absorb the light of the LED chip, thereby forming white light for outdoor lighting. However, due to the lack of contribution of red and green light, it has a relatively low color rendering index (Ra < 80), and the luminous efficiency of white light in the assembled device is still relatively lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67H01L33/50
CPCH01L33/50C09K11/7731Y02B20/00
Inventor 吴明娒李晓辉石建新
Owner SUN YAT SEN UNIV
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