Red fluorescent powder and luminescent device with red fluorescent powder

A technology of red phosphor and light-emitting device, which is applied in the field of fluorescent materials, and can solve the problems of low luminous efficiency of red phosphor and low color gamut of light-emitting devices

Active Publication Date: 2021-09-28
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a red phosphor and a light-emitting device with it, and solve the problems of low luminous efficiency of the red phosphor and low color gamut of the light-emitting device through technological breakthroughs

Method used

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  • Red fluorescent powder and luminescent device with red fluorescent powder
  • Red fluorescent powder and luminescent device with red fluorescent powder
  • Red fluorescent powder and luminescent device with red fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Press (Sr 3.9 Na 0.1 )(Al 13.93 sc 0.06 )O 25 : 0.01Mn stoichiometric ratio, accurate weighing of SrCO 3 (99.9%),Al 2 o 3 (99.9%), Sc 2 o 3 (99.9%),MnCO 3 (99.9%), Na 2 CO 3 (99.9%) raw materials, and placed in a mortar, fully mixed and ground for 30 minutes to obtain a mixture. Under an air atmosphere, the mixture was raised to 900°C at a rate of 10°C / min and kept for 1 hour, and then heated to 1250°C for 5 hours. The sintered product was obtained after the furnace temperature was naturally lowered to room temperature. After the sintered product was taken out, it was crushed, washed, sieved and then dried to obtain the phosphor powder of Example 1 with a relative emission intensity of 197. Carry out X-ray ray scanning to this fluorescent powder, obtain figure 1 , wherein, the target used is a Co target, the scanning Bragg angle is 20-80°, and the scanning speed is 5° / min; the fluorescence spectrum test of the phosphor is carried out, and the excitation mon...

Embodiment 2

[0031] Press (Sr 3.9 Na 0.4 )(Al 13.93 sc 0.06 )O 25 : 0.01Mn stoichiometric ratio, accurate weighing of SrCO 3 (99.9%),Al 2 o 3 (99.9%), Sc 2 o 3 (99.9%),MnCO 3 (99.9%), Na 2 CO 3 (99.9%) raw materials, and placed in a mortar, fully mixed and ground for 30 minutes to obtain a mixture. In an air atmosphere, the mixture was raised to 900°C at a rate of 10°C / min and kept for 1 hour, and then heated to 1200°C for 4 hours. The sintered product was obtained after the furnace temperature was naturally lowered to room temperature. After the sintered product was taken out, it was crushed, washed, sieved and then dried to obtain the phosphor powder of Example 2 with a relative emission intensity of 200. Carry out X-ray ray scanning to this fluorescent powder, obtain figure 1 , wherein, the target used is a Co target, the scanning Bragg angle is 20-80°, and the scanning speed is 5° / min; the fluorescence spectrum test of the phosphor is carried out, and the excitation spectr...

Embodiment 3

[0033] Press (Sr 3.4 Na 0.6 )(Al 13.93 sc 0.06 )O 25 : 0.01Mn stoichiometric ratio, accurate weighing of SrCO 3 (99.9%),Al 2 o 3 (99.9%), Sc 2 o 3 (99.9%),MnCO 3 (99.9%), Na 2 CO 3 (99.9%) raw materials, and placed in a mortar, fully mixed and ground for 30 minutes to obtain a mixture. Under an air atmosphere, the mixture was raised to 900°C at a heating rate of 10°C / min and kept for 1 hour, then raised to 1350°C and held for 5 hours. After the furnace temperature naturally dropped to room temperature, the sintered product was obtained. After the sintered product was taken out, it was crushed, washed, sieved and then dried to obtain the phosphor powder of Example 3 with a relative emission intensity of 244. Carry out X-ray ray scanning to this fluorescent powder, obtain figure 1 , wherein, the target used is a Co target, the scanning Bragg angle is 20-80°, and the scanning speed is 5° / min; the fluorescence spectrum test of the phosphor is carried out, and the exci...

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Abstract

The invention provides red fluorescent powder and a luminescent device with the red fluorescent powder. The fluorescent powder at least comprises an element M, an element A, an element D and an element R. The element M comprises one or two of Ca, Sr, Ba and Mg and can further comprise one or two of Na and K; the A element comprises Al or Al and Ga, and further comprises one or two of Sc, Y, Lu and La; the element D is selected from one or two of O, N and F and must contain O; the R element is one or two of Mn, Ce and Eu, and must contain Mn; the fluorescent powder has a crystal structure which is the same as that of Sr4Al14O25. As the ion radius of Sc < 3 + > is larger than that of Al < 3 + >, lattice distortion caused by doping of Mn < 4 + > ions can be relieved by doping the Sc < 3 + > ions, and the local environment of Mn < 4 + > is improved, so that the luminous intensity of Mn < 4 + > is enhanced. The red fluorescent powder has relatively strong absorption in ultraviolet-blue light regions, and can emit relatively strong narrow-band red light under the excitation of ultraviolet-blue light.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a red fluorescent powder and a light-emitting device having the same. Background technique [0002] As the fourth-generation light source, white LEDs are widely used in lighting and display fields because of their high luminous efficiency, long life, good stability, small size, and environmental friendliness. White LED has a market share of about 80% in the field of backlight for liquid crystal display, and has become the main choice of backlight for display. [0003] At present, the mainstream implementation of white LEDs for display is to match blue chips with red and green phosphors with narrow half-wave widths. The color purity and half-wave width of the phosphor become the key factors affecting the color gamut coverage of the display. The currently commercially available phosphor systems in the field of backlight sources are nitrogen oxide green phosphors and fluoride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/57C09K11/80H01L33/50
CPCC09K11/576C09K11/7718C09K11/7731H01L33/504
Inventor 刘荣辉罗林刘元红秦少伟陈观通邵冷冷
Owner GRIREM ADVANCED MATERIALS CO LTD
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