Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
[0012] So far SrCa 2 sc 6 o 12 Have not yet seen its public reports or patent applications on luminescent materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Scandate green phosphor and preparation method thereof
  • Scandate green phosphor and preparation method thereof
  • Scandate green phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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 <x<0.5; the D is at least one of Li and Na.

[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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com