Blue-to-cyan color adjustable fluorescent powder and preparation method thereof

A phosphor and cyan technology, which is applied in the field of blue to cyan color-tunable phosphors and its preparation, can solve the problems affecting the luminous performance of three-color phosphors, low luminous efficiency, and reduced performance of white LEDs.

Inactive Publication Date: 2015-04-22
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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  • Blue-to-cyan color adjustable fluorescent powder and preparation method thereof
  • Blue-to-cyan color adjustable fluorescent powder and preparation method thereof
  • Blue-to-cyan color adjustable fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh cerium oxide (CeO 2 ) 0.0172g, anhydrous lithium carbonate (Li 2 CO 3 ) 0.0040g, calcium carbonate (CaCO 3 ) 3.9840g, silicon dioxide (SiO 2 ) 1.2000g, ammonium fluoride (NH 4 F) 0.7408g was fully ground in an agate mortar and mixed evenly, then fired in a carbon monoxide reducing atmosphere, sintered at 1000°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 3.98 Li 0.01 Ce 0.01 Si 2 o 7 f 2 .

[0023] The diffraction peak position of the obtained phosphor material is consistent with that of the crystallographic database PDF#41-1474, indicating that the material structure and matrix Ca 4 Si 2 o 7 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 330...

Embodiment 2

[0025] Weigh cerium oxide (CeO 2 ) 0.0344g, anhydrous lithium carbonate (Li 2 CO 3 ) 0.0080g, calcium carbonate (CaCO 3 ) 3.9640g, silicon dioxide (SiO 2 ) 1.2000g, ammonium fluoride (NH 4 F) 0.7408g was fully ground in an agate mortar and mixed evenly, then fired in a carbon monoxide reducing atmosphere, sintered at 1000°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 3.96 Li 0.02 Ce 0.02 Si 2 o 7 f 2 .

[0026] The fluorescent powder material of the present invention emits strong blue light under the excitation of 365nm near ultraviolet light, the position of the main emission peak is 430nm, and a weak peak appears in the range of 450nm-600nm, see the attached image 3 -b; color coordinates are (0.165, 0.144), see attached Figure 4 -b.

Embodiment 3

[0028] Weigh cerium oxide (CeO 2 ) 0.0688g, anhydrous lithium carbonate (Li 2 CO 3 ) 0.0160g, calcium carbonate (CaCO 3 ) 3.9240g, silicon dioxide (SiO 2 ) 1.2000g, ammonium fluoride (NH 4 F) 0.7408g was thoroughly ground in an agate mortar and mixed evenly, then calcined in a hydrogen reducing atmosphere, sintered at 800°C for 12 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 3.92 Li 0.04 Ce 0.04 Si 2 o 7 f 2 .

[0029] The fluorescent powder material of the present invention emits strong blue light under the excitation of 365nm near ultraviolet light, the intensity of the main emission peak at 430nm is weakened, and the intensity of the weak peak in the range of 450nm-600nm is enhanced, see the attached image 3 -c; color coordinates are (0.169, 0.183), see attached Figure 4 -c.

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Abstract

The invention discloses blue-to-cyan color adjustable fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is Ca4-2 xLixCexSi2O7F2, wherein x refers to the mole percentage of an activation ion Ce<3+> to a relative alkaline-earth metal ion Ca<2+>, x is greater than or equal to 0.001 and less than or equal to 0.10. The fluorescent powder is prepared by jointly adding the activation ion Ce<3+> and a charge compensation ion Li<+> into a matrix Ca4Si2O7F2, and can be effectively excited by near ultraviolet light, and by changing the concentrations of the Ce<3+> ion and the Li<+> ion, the proportion of blue-to-cyan light emission peaks is adjusted, and then the adjustment on blue-to-cyan light emission of the fluorescent powder material is realized. Concretely, with the increasing of the doping concentration of the Ce<3+> ion, the content of the charge compensation ion Li<+> is increased, and the emitting color of Ca4-2xLixCexSi2O7F2 is changed from blue to cyan.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorescent powder with adjustable blue to cyan color 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+ , green powder ZnS:(Cu + , Al 3+ ) and P...

Claims

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Application Information

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