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Mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and preparation method thereof

A technology of mixed valence and phosphor, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous efficiency, affecting the luminous performance of three primary color phosphors, and reducing the performance of white LEDs

Active Publication Date: 2015-09-02
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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  • Mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and preparation method thereof
  • Mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and preparation method thereof
  • Mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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) 0.7408g was thoroughly ground in an agate mortar and mixed evenly, then calcined in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and cooled naturally to room temperature. The sample is taken out and ground, and finally the product is obtained, and the composition of the fluorescent powder material is: Ca 1.99 Eu 0.01 SiO 2 f 2 .

[0025] The diffraction peak position of the obtained phosphor material is consistent with that of the crystallographic database PDF#19-1131, indicating that the material structure and matrix Ca 2 SiO 2 f 2 agree, see figure 1 . figure 2 For the excitation spectrum of the material of this embodiment, from figure 2 It can be seen that the phosphor material of the present invention can be effectively excited by 320nm-420nm near ultraviolet light. The phosphor material ...

Embodiment 2

[0027] 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) 0.7408g was thoroughly ground in an agate mortar and mixed evenly, then calcined in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and cooled naturally to room temperature. The sample is taken out and ground, and finally the product is obtained, and the composition of the fluorescent powder material is: Ca 1.99 Eu 0.03 SiO 2 f 2 .

[0028] Under the excitation of 355nm near-ultraviolet light, the phosphor material of the present invention, trivalent Eu 3+ Red-emitting sharp edge and divalent Eu 2+ The blue light emission broadband intensity ratio increases, see appendix image 3 -b; color coordinates are (0.277, 0.199), see attached Figure 4 -b.

Embodiment 3

[0030] 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) 0.7408g was thoroughly ground in an agate mortar and mixed evenly, then calcined in a carbon monoxide reducing atmosphere, sintered at 900°C for 6 hours, and cooled naturally to room temperature. The sample is taken out and ground, and finally the product is obtained, and the composition of the fluorescent powder material is: Ca 1.99 Eu 0.05 SiO 2 f 2 .

[0031] Under the excitation of 355nm near-ultraviolet light, the phosphor material of the present invention, trivalent Eu 3+ Red-emitting sharp edge and divalent Eu 2+ The blue light emission broadband intensity ratio continues to increase, see appendix image 3 -c; color coordinates are (0.337, 0.235), see attached 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 color-tunable fluorescent powder doped with europium ions in a mixed valence state and a single matrix and a preparation method thereof. Background technique [0002] Phosphor-converted white light-emitting diodes (pc-LEDs) have outstanding features such as high brightness, small size, long life, non-destructive, easy design, fast conversion and environmental friendliness, and will replace incandescent LEDs in the future. Lamps, fluorescent lamps, sodium lamps, etc. have become a new generation of lighting sources. Although several methods of packaging WLEDs have been developed so far, the combination of three primary colors (red, green, and blue) phosphors using near-ultraviolet (n-UV) InGaN-based chips is considered the most convenient route. At present, the main commercial near-ultraviolet InGaN-based LEDs phosphor is blue powder BaMgAl 10 o 17 :Eu 2+ , gre...

Claims

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Application Information

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IPC IPC(8): C09K11/61
Inventor 谢木标
Owner LINGNAN NORMAL UNIV
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