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A kind of single-ion-doped white fluorescent powder applied to WLED devices and preparation method thereof

A fluorescent powder 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 low fluorescence efficiency, poor chemical stability, harsh synthesis conditions, etc., and achieve high luminous intensity and good color stability. Effect

Active Publication Date: 2022-02-01
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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  • A kind of single-ion-doped white fluorescent powder applied to WLED devices and preparation method thereof
  • A kind of single-ion-doped white fluorescent powder applied to WLED devices and preparation method thereof
  • A kind of single-ion-doped white fluorescent powder applied to WLED devices and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh barium carbonate (BaCO 3 )0.5811g, Tan oxide (Ta 2 o 5 )0.4487g, europium oxide (Eu 2 o 3 ) 0.01786g, zinc oxide (ZnO) 0.0826g. Grind the above-mentioned 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 10h. After the end, take out the grinding, and then carry out the second step of sintering in an air atmosphere at 1100°C, and the constant temperature time is 10h. After the end, take out the grinding, and carry out the third step of sintering at 1100°C again, and the constant temperature time is 10h. 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. Refined by Rietveld ( Figure 2a and Figure 2b ) further shows that the preparation scheme of multi-step sintering will not affect the phase. ...

Embodiment 2

[0029] Calcium carbonate (SrCO 3 ) 0.5093g, Tan oxide (Ta 2 o 5 )0.5257g, europium oxide (Eu 2 o 3 ) 0.0209g, and zinc oxide (ZnO) 0.0968g. 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 a reducing atmosphere at 800 ° C. The constant temperature time is 10 h. After the end, take out the grinding, and then carry out the second step of sintering in an air atmosphere at 1100°C, and the constant temperature time is 10h. After the end, take out the grinding, and carry out the third step of sintering at 1100°C again, and the constant temperature time is 10h. 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 significantly affect the original phase. The fluorescence emissio...

Embodiment 3

[0031] Strontium carbonate (SrCO 3 )0.6282g, niobium oxide ((Nb 2 o 5 )0.4039g, 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 10h. After the end, take out the grinding, and then carry out the second step of sintering in an air atmosphere at 1100°C, and the constant temperature time is 10h. After the end, take out the grinding, and carry out the third step of sintering at 1100°C again, and the constant temperature time is 10h. 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. Such as figure 1 As shown in the middle line 1, all the diffraction peaks can correspond to the standard peak card (PDF#17-0177), which further shows tha...

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Abstract

The invention discloses a single-ion-doped white fluorescent powder applied to WLED devices, the chemical formula of which is: A 3 B'B'' 2 o 9 : x RE 3+ , A is an alkaline earth metal, B' is a low-valence transition metal, and B'' is a high-valence transition metal; x is the dopant ion molar ratio coefficient, and the value ranges are: 0.001≤ x ≤0.999;RE 3+ For trivalent dopant ions, selected from Sm 3+ 、Tm 3+ 、Eu 3+ , Ga 3+ , La 3+ 、Sc 3+ , Y 3+ . The white phosphor powder for WLED of the present invention, on the premise of ensuring the structural characteristics, finds a new type of single-matrix white phosphor powder doped with a single trivalent ion, and the obtained material has a high luminous intensity of warm white light, and It has broad emission (400nm‑850nm) and high color rendering with good color stability.

Description

technical field [0001] The invention relates to a novel single-ion activated white fluorescent powder used in WLED devices and a preparation method thereof. Background technique [0002] 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 of the assembled device is still relatively low, so that high...

Claims

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Application Information

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Patent Type & Authority Patents(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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