Scandate green phosphor and preparation method thereof

A technology of green fluorescent powder and scandate, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of short life, easy aging of packaging materials, and difficult preparation of high-efficiency power UVLEDs, etc., to improve color rendering sexual effect

Inactive Publication Date: 2016-08-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the following disadvantages: low electro-optic conversion efficiency; powder mixing is difficult, and high-efficiency phosphors need to be developed; packaging materials are prone to aging under ultraviolet light, and their l...

Method used

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  • Scandate green phosphor and preparation method thereof
  • Scandate green phosphor and preparation method thereof
  • Scandate green phosphor and preparation method thereof

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preparation example Construction

[0052] The present invention also provides a method for preparing the above-mentioned fluorescent powder, comprising: mixing Sr precursor, Ce precursor, D precursor, Ca precursor and Sc precursor, performing a high-temperature solid-state reaction to obtain the fluorescent powder;

[0053] The molar ratio of Sr, Ce, D, Ca and Sc in the Sr precursor, Ce precursor, D precursor, Ca precursor and Sc precursor is (1-2x): x: x: 2: 6; 0

[0054] Wherein, the x and D are the same as those described above, and will not be repeated here.

[0055] The Sr precursor can be a compound containing Sr well known in the art, and there is no special limitation. In the present invention, it is preferably a carbonate of Sr, an oxide of Sr, an oxalate of Sr, a nitrate of Sr, etc. At least one of, more preferably carbonate of Sr; the Ce precursor is at least one of carbonate of Ce, oxide of Ce, oxalate of Ce and nitrate of Ce, etc., more It is preferably...

Embodiment 1

[0065] The raw material is SrCO 3 (analytical pure), CaCO 3 (analytically pure) and Sc 2 o 3 (Analytical pure), the molar ratio is 1:2:3, the above raw materials are ground and mixed, dried, pressed into tablets under a pressure of 2 MPa, put into a crucible, sintered in a high-temperature furnace at 1350 ° C for 10 h, and cooled to room temperature with the furnace , the theoretical chemical composition is obtained as SrCa 2 sc 6 o 12 s material.

[0066] Utilize X-ray diffraction to analyze the material obtained in embodiment 1, obtain its X-ray diffraction pattern, as figure 1 shown. Inquire in the international crystallographic database and confirm that this spectrum belongs to the hexagonal space group as P6 3 / m and the chemical composition is SrCa 2 sc 6 o 12 The standard spectrum is consistent.

Embodiment 2

[0083] The raw material is SrCO 3 (analytical pure), CeO 2 (99.99%), Li 2 CO 3 (analytical pure), CaCO 3 (analytically pure) and Sc 2 o 3 (Analytical pure), the molar ratio is 0.98:0.01:0.01:2:3, the above raw materials are ground and mixed, dried and pressed into tablets under a pressure of 1 MPa, put into a crucible, and under an ammonia reducing atmosphere, in a high-temperature furnace, Sintering at 1350°C for 10h, cooling to room temperature with the furnace, the theoretical chemical composition is Sr 0.98 Ce 0.01 Li 0.01 Ca 2 sc 6 o 12 of fluorescent powder.

[0084] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment 2, obtain its excitation spectrogram, as Figure 8 shown. It can be seen that the excitation bands of the phosphor are distributed in both the violet-blue light region and the ultraviolet light region.

[0085] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment ...

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Abstract

The invention discloses scandate green phosphor and a preparation method thereof, and belongs to the technical field of light emitting materials. The chemical formula of the scandate green phosphor is Sr1-2xCexDxXa2Sx6O12; in the formula, x is greater than 0 and less than 0.5; D is at least one of Li, Na and the like. The preparation method of the scandate green phosphor comprises the following steps: mixing an Sr precursor, a Ce precursor, a D precursor, a Ca precursor and an Sc precursor, and performing high-temperature solid-phase reaction, thereby obtaining the scandate green phosphor of which the chemical formula is Sr1-2xCexDxXa2Sx6O12. The scandate green phosphor has completely novel chemical composition, Ce<3+> is taken as an activator, and the phosphor can be activated by ultraviolet light and violet-blue light to emit green light, so that the ultraviolet light can be converted into green light through the fluorescent material, then the fluorescent material can be used in a yellow fluorescent powder converted white light LED, and the color rendering property of the LED can be improved.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a scandate green fluorescent powder and a preparation method thereof. Background technique [0002] Relying on LED conversion to achieve white light mainly has the following methods: [0003] 1) Multi-chip LEDs. The RGB tricolor LED chips are packaged together to produce white light. The technology of combining RGB three-color LEDs to form white LEDs is the most efficient, avoiding the energy loss caused by the Stokes shift in the process of phosphor luminescence conversion, and can obtain the highest luminous efficiency. At the same time, three different kinds of light can be controlled separately. The light intensity of the color LED can be adjusted to achieve the effect of full-color discoloration. However, the various light colors of the white LED produced by this method are not consistent with the change of driving current and temperature, and th...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7702C09K11/7768H01L33/502
Inventor 解荣军周天亮庄逸熙李烨
Owner XIAMEN UNIV
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