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A trivalent dysprosium ion-doped single-matrix white phosphor applied to WLED devices and its preparation method

A dysprosium ion and single-substrate technology, applied in chemical instruments and methods, semiconductor devices, luminescent materials, etc., can solve the problem of low color rendering of phosphors, and achieve cheap and easy-to-obtain raw materials, high color rendering, and high luminous intensity Effect

Active Publication Date: 2020-08-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports, Dy in most matrices 3+ The launch is missing 4 f 9 / 2 Energy level transition to 6 h 11 / 2 red light emission, resulting in poor color rendering of the phosphor

Method used

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  • A trivalent dysprosium ion-doped single-matrix white phosphor applied to WLED devices and its preparation method
  • A trivalent dysprosium ion-doped single-matrix white phosphor applied to WLED devices and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh barium carbonate (BaCO 3 ) 0.5919 g, flux boric acid (H 3 BO 3 ) 0.0187 g, titanium dioxide (TiO 2 ) 0.1598 g, gadolinium oxide (Gd 2 o 3 ) 0.1813 g, the above raw materials were ground in an agate mortar, ground evenly, poured into a corundum crucible, and then put the corundum crucible into a high-temperature furnace, and carried out the first step of pre-firing at 900 °C, and the holding time was 4 h. Then it was taken out for grinding, followed by the second step of sintering at 1300 °C for 10 h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product. The X-ray powder diffraction results of the product are as follows: figure 1 shown. Such as figure 1 As shown in the middle spectrum line 1, all the diffraction peaks can be compared with Ba 6 Gd 2 Ti 4 o 17 The peak correspondence in the standard card (JCPDS #43-0422) indicates that the multi-step sintering preparation scheme does not affect the ...

Embodiment 2

[0018] Weigh barium carbonate (BaCO 3 ) 0.5919 g, flux boric acid (H 3 BO 3 ) 0.0187 g, titanium dioxide (TiO 2 ) 0.1598 g, dysprosium oxide (Dy 2 o 3 ) 0.0009 g, gadolinium oxide (Gd 2 o 3 ) 0.1803 g. Grind the above raw materials in an agate mortar, grind them evenly, pour them into a corundum crucible, then put the corundum crucible into a high-temperature furnace, and carry out the first step of pre-firing at 900 °C for 4 h. Then it was taken out for grinding, followed by the second step of sintering at 1300 °C for 10 h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product. The X-ray powder diffraction results of the product are as follows: figure 1 As shown in the middle spectrum line 2, all the diffraction peaks are basically the same as those of the standard peak (JCPDS #43-0422), indicating that the introduction of dysprosium ions will not have a significant impact on the original phase. Fluorescence em...

Embodiment 3

[0020] Weigh barium carbonate (BaCO 3 ) 0.5919 g, flux boric acid (H 3 BO 3 ) 0.0187 g, titanium dioxide (TiO 2 ) 0.1598 g, dysprosium oxide (Dy 2 o 3 ) 0.0047 g, gadolinium oxide (Gd 2 o 3 ) 0.1767 g. Grind the above raw materials in an agate mortar, grind them evenly, pour them into a corundum crucible, then put the corundum crucible into a high-temperature furnace, and carry out the first step of pre-firing at 1000 °C for 3 h. Then it was taken out for grinding, followed by the second step of sintering at 1300 °C for 10 h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product.

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Abstract

The invention discloses a trivalent dysprosium ion doped single-matrix white fluorescent powder applied to a WLED apparatus and a preparation method thereof. The trivalent dysprosium ion doped single-matrix white fluorescent powder has a chemical formula: Ba6Ln2-xTi4O17: XDy<3+>, wherein Ln is equal to Gd, Y, Lu or La, active ion is Dy<3+>, x is concentration (in terms of molar) of active ions Dy<3+>, and x is greater than or equal to 0.01 and smaller or equal to 2. The trivalent dysprosium ion doped single-matrix white fluorescent powder applied to the WLED apparatus is high in light-emittingstrength, is good in thermal stability, is high in color rendering property, and can be used as a near-ultraviolet excited WLED fluorescent material. The fluorescent powder can be excited at 366 nm,has relatively strong emission at 490mm, 578 mm and 678 mm, can be matched with a near-ultraviolet chip to generate white light. The fluorescent powder is synthesized through a high-temperature solid-phase method, the synthesis method is simple, the synthesis temperature is relatively low, used raw materials are cheap and easily available; and the trivalent dysprosium ion doped single-matrix whitefluorescent powder is environmentally friendly, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a trivalent dysprosium ion-doped single-matrix white fluorescent powder used in WLED devices and a preparation method thereof. Background technique [0002] White light LEDs can be realized by using ultraviolet LED chips and red, green, and blue three primary color phosphors that can be excited by them or multicolor phosphors excited by ultraviolet LED chips. Since the human eye is not sensitive to ultraviolet light, the color of the white light LED is only determined by the phosphor powder at this time, and the obtained white light is more stable. However, due to the different attenuation rates of the mixed phosphors, and the blue light is easily reabsorbed by the red and green phosphors, the lumen efficiency and color stability of the white LED are not high. [0003] Compared with the above-mentioned solutions, using ultraviolet light to directly excite single-matrix phosphors to realize white light LEDs has the advantages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7768H01L33/502
Inventor 吴明娒洪俊宇梁琼云周磊石建新
Owner SUN YAT SEN UNIV