A mixed-valence europium ion-doped single-matrix color-tunable fluorescent powder and its preparation method

A technology of mixed valence and phosphor, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as low luminous efficiency, reduced performance of white light LED, and affecting the luminous performance of trichromatic phosphors

Active Publication Date: 2016-08-24
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these phosphors have certain shortcomings, and the final packaged WLEDs have defects in color temperature, display index, luminous efficiency, and chemical stability.
Among them, due to the low luminous efficiency of the blue phosphor, the blue light is easily absorbed by the red and green phosphors, etc., which affects the luminous performance of the near-ultraviolet excited three-color phosphor, thereby reducing the performance of the white LED.

Method used

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  • A mixed-valence europium ion-doped single-matrix color-tunable fluorescent powder and its preparation method
  • A mixed-valence europium ion-doped single-matrix color-tunable fluorescent powder and its preparation method
  • A mixed-valence europium ion-doped single-matrix color-tunable fluorescent powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh europium oxide (Eu 2 O 3 ) 0.0176g, calcium carbonate (CaCO 3 )1.9918g, silicon dioxide (SiO 2 ) 0.6008g, ammonium fluoride (NH 4 F) After 0.7408 g is fully ground in an agate mortar and mixed uniformly, it is fired in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and naturally cooled to room temperature. Take the sample out and grind, and finally get the product. The phosphor material composition is: Ca 1.99 Eu 0.01 SiO 2 F 2 .

[0026] The diffraction peak position of the obtained phosphor material is consistent with the crystallographic database PDF#19-1131, indicating the material structure and matrix Ca 2 SiO 2 F 2 Consistent, see Figure 1. Figure 2 is the excitation spectrum of the material in this example. It can be seen from Figure 2 that the phosphor material of the present invention can be effectively excited by near ultraviolet light from 320 nm to 420 nm. The phosphor material of this embodiment emits a strong blue emission broadba...

Embodiment 2

[0028] Weigh europium oxide (Eu 2 O 3 )0.0528g, calcium carbonate (CaCO 3 )1.9717g, silicon dioxide (SiO 2 ) 0.6008g, ammonium fluoride (NH 4 F) After 0.7408 g is fully ground in an agate mortar and mixed uniformly, it is fired in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and naturally cooled to room temperature. Take the sample out and grind, and finally get the product. The phosphor material composition is: Ca 1.99 Eu 0.03 SiO 2 F 2 .

[0029] Under the excitation of 355nm near ultraviolet light, the phosphor material of the present invention has trivalent Eu 3+ Red light emission sharp front and divalent Eu 2+ The broadband intensity ratio of blue light emission increases, see Figure 3-b; the color coordinates are (0.277, 0.199), see Figure 4-b.

Embodiment 3

[0031] Weigh europium oxide (Eu 2 O 3 )0.0880g, calcium carbonate (CaCO 3 )1.9518g, silicon dioxide (SiO 2 )0.6008, ammonium fluoride (NH 4 F) After 0.7408 g is fully ground in an agate mortar and mixed uniformly, it is fired in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and naturally cooled to room temperature. Take the sample out and grind, and finally get the product. The phosphor material composition is: Ca 1.99 Eu 0.05 SiO 2 F 2 .

[0032] Under the excitation of 355nm near ultraviolet light, the phosphor material of the present invention has trivalent Eu 3+ Red light emission sharp front and divalent Eu 2+ The broadband intensity ratio of blue light emission continues to increase, see Figure 3-c; the color coordinates are (0.337, 0.235), see Figure 4-c.

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Abstract

The invention discloses mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and a preparation method thereof. An expression formula of the chemical composition of the fluorescent powder is Ca2-xEuxSiO2F2, wherein Eu is an active ion, and is in +2 and +3 mixed-valence state; x is a molar percentage coefficient accounted by the active ion Eu relative to an alkaline earth metal ion Ca, and x is more than or equal to 0.001 and less than or equal to 0.10; according to the fluorescent powder, the active ion Eu is doped into a matrix Ca2SiO2F2, and under the condition that the matrix Ca2SiO2F2 can be effectively activated by near-ultraviolet light, adjustable emission of a fluorescent powder material from blue light to orange red light can be achieved by changing the doping concentration of the active ion Eu and adjusting the emission peak ratio of the blue light of bivalent Eu ions to red light of trivalent Eu ions; and specifically, with the increase of Eu ion doping concentration, the relative strength of red light emission of Eu<3+> can be increased, and the light emitting color of Ca2-xEuxSiO2F2 is gradually changed from blue to white, and is continuously changed to orange.

Description

Technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a mixed-valence europium ion doped with a single matrix color adjustable phosphor and a preparation method thereof. Background technique [0002] Phosphor-converted white light-emitting diodes (pc-LEDs) have outstanding characteristics such as high brightness, small size, long life, not easily damaged, easy to design, fast conversion and environmental friendliness, and will replace incandescent in the future Lamps, fluorescent lamps, sodium lamps, etc. have become a new generation of lighting sources. Although there have been several methods for packaging WLEDs so far, the use of near-ultraviolet (n-UV) InGaN-based chips combined with three primary colors (red, green and blue) phosphors is considered the most convenient way. At present, the main commercial near-ultraviolet InGaN-based LEDs phosphor is blue powder BaMgAl 10 O 17 :Eu 2+ , Green powder ZnS: (Cu + ,Al 3+ ) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/61
Inventor 谢木标
Owner LINGNAN NORMAL UNIV
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