Red fluorescent powder and preparation method thereof

A technology for red phosphor powder and phosphor powder is applied in the field of red phosphor powder and its preparation, and can solve the problems of difficult preparation, short lifespan, and difficulty in powder mixing of high-efficiency power UVLEDs.

Inactive Publication Date: 2018-01-30
河北紫旭节能环保技术咨询有限公司
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  • 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 life is short, and there is a hidden danger of ultraviolet leakage; high-efficiency power type UV LEDs are not easy to manufacture
[0007] Currently, CaTiO 3 Doping Mn is usually used to make dielectric ceramics or ferroelectric materials, and its use belongs to different technical fields from the application of the present invention, and its application in luminescent materials has not been seen yet.

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  • Red fluorescent powder and preparation method thereof
  • Red fluorescent powder and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned fluorescent powder, comprising: A) mixing Ca precursor, Ti precursor and Mn precursor, performing high-temperature solid-state reaction to obtain fluorescent powder;

[0035] The molar ratio of Ca, Ti and Mn in the Ca precursor, Ti precursor and Mn precursor is 1:(1-x):x; 0<x<1.

[0036] Wherein, the x is the same as that described above, and will not be repeated here.

[0037] The Ca precursor is a compound containing Ca well known in the art, and there is no special limitation. In the present invention, Ca carbonate, Ca oxide, Ca oxalate and Ca nitrate are preferred. One or more of, more preferably a carbonate of Ca; the Ti precursor is an oxide of Ti; the Mn precursor is a carbonate of Mn, an oxide of Mn, an oxalate of Mn and One or more of Mn nitrates, more preferably Mn oxides.

[0038] The purity of the Ca precursor, Ti precursor and Mn precursor is preferably not less than 99.5% inde...

Embodiment 1

[0047] Raw material is CaCO 3 (analytical pure), TiO 2 (99.99%) and MnO 2(Analytical pure), the molar ratio is 1:0.98:0.02, the above raw materials are ground and mixed, dried, pressed into tablets under a pressure of 2 MPa, put into a crucible, and sintered in a high-temperature furnace at 1200°C under an ammonia reducing atmosphere After 4 hours, it was cooled to room temperature with the furnace, and the theoretical chemical composition was obtained as CaTi 0.98 mn 0.02 o 3 of fluorescent powder.

[0048] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment 1, obtain its excitation spectrogram, as figure 1 shown. It can be seen that the excitation band of the fluorescent material mainly falls in the blue light region.

[0049] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment 1, obtain its emission spectrogram, as figure 2 shown. It can be seen that the material can be effectively e...

Embodiment 2

[0051] Raw material is CaCO 3 (analytical pure), TiO 2 (99.99%) and MnO 2 (Analytical pure), the molar ratio is 1:0.95:0.05, the above raw materials are ground and mixed, dried, pressed into tablets under a pressure of 1 MPa, put into a crucible, and sintered in a high-temperature furnace at 1300°C under an ammonia reducing atmosphere After 6 hours, cool down to room temperature with the furnace, and the theoretical chemical composition is CaTi 0.95 mn 0.05 o 3 of fluorescent powder.

[0052] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment 2, obtain its excitation spectrogram, as image 3 shown. It can be seen that the excitation band of the phosphor mainly falls in the blue light region.

[0053] Utilize fluorescence spectrometer to analyze the fluorescent material obtained in embodiment 2, obtain its emission spectrogram, as Figure 4 shown. It can be seen that the phosphor can be effectively excited by blue light to emit...

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Abstract

The invention provides red fluorescent powder and a preparation method thereof. The fluorescent powder has a chemical composition, i.e., CaTi1-xMnxO3, wherein x is greater than 0 and is smaller than 1. The red fluorescent powder and the preparation method thereof have the advantages that the fluorescent powder provided by the invention has bran-new chemical composition, and Mn<4+> serves as an activator; the fluorescent powder can be excited by blue light to emit red light, so that the fluorescent powder can be used for converting the blue light into the red light.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a red 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 the attenuati...

Claims

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Application Information

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IPC IPC(8): C09K11/67H01L33/50
Inventor 马秀巧
Owner 河北紫旭节能环保技术咨询有限公司
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