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Phosphor and method for production thereof, and light source

A manufacturing method and technology of phosphors, applied in the field of phosphors, can solve the problems of unsatisfactory and high proportions, and achieve the effect of cheap manufacturing costs

Active Publication Date: 2012-05-16
CITIZEN ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphors containing this nitrogen have a higher ratio of covalent bonds than oxide-based phosphors, so they have a characteristic of having a good excitation band even for light with a wavelength of 400 nm or more, and are attracting attention as phosphors for white LEDs, but The status quo is not up to a satisfactory level

Method used

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  • Phosphor and method for production thereof, and light source
  • Phosphor and method for production thereof, and light source
  • Phosphor and method for production thereof, and light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Ready to market Ca 3 N 2 (2N), AlN(3N), Si 3 N 4 (3N), Eu 2 o 3 (3N), respectively by Ca 3 N 2 is 0.985 / 3mol, AlN is 1.0mol, Si 3 N 4 is 1 / 3mol, Eu 2 o 3 0.015 / 2mol Each raw material was weighed and mixed in a spherical body under an inert atmosphere of nitrogen using a mortar. Put the mixed raw materials into the crucible and set it in the firing furnace. While maintaining the pressure of 0.05Mpa, let the nitrogen gas of 1.0L / min flow through it in a nitrogen atmosphere pressurized to 0.05Mpa, and keep it at 1600°C After firing for 3 hours, cooling from 1600°C to 200°C in one hour, the composition formula Ca 0.985 AlSiN 3 :Eu 0.0150 Phosphors representing the generated phase. The SEM observation particle diameter of the obtained phosphor sample was 3-4 micrometers. (Even in Example 2 to Example 5 below, the SEM observation particle size of the obtained phosphor samples was 3 to 4 μm)

[0119] The obtained phosphor was irradiated with an excitation light...

Embodiment 2

[0134] Put the mixed raw materials into the crucible, keep it at 1500°C for 3 hours in a nitrogen environment for firing, and then cool it from 1500°C to 200°C for one hour, except to obtain the composition containing Ca 0.985 AlSiN 3 :Eu 0.0150 The phosphor of Example 2 was obtained in the same manner as in Example 1 except for the phosphor showing the generated phase.

[0135] Table 1 shows the measurement results of the oxygen and nitrogen concentrations, luminescent properties and powder properties of the phosphor samples, and the obtained phosphor powder X-ray diffraction patterns are shown in Fig. 4(A) to Fig. 4 with thick solid lines. (G).

[0136] Figure 4(A) shows the X-ray diffraction patterns of the Bragg angle (2θ) in the entire range of 0°-90°, and Figure 4(B)-(G) are enlarged views of the characteristic parts of the Bragg angle. Figure 4(B) is in the range of 35°~40°, Figure 4(C) is in the range of 40°~45°, Figure 4(D) is in the range of 55°~60°, Figure 4(E) i...

Embodiment 3

[0138] In addition to setting the mixing ratio of each raw material to Ca 3 N 2 Except for (0.985-0.25) / 3mol and CaO being 0.25mol, a phosphor sample of Example 3 was produced in the same manner as in Example 2, and the emission characteristics were measured. Table 1 shows the measurement results of the oxygen and nitrogen concentrations, luminescence characteristics, and powder characteristics of the phosphor samples, and the obtained phosphor powder X-ray diffraction patterns are shown in Fig. 4(A) to Fig. 4 with thin solid lines. (G).

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Abstract

The present invention provides a phosphor having an emission characteristic such that a peak wavelength of light emission is in a range from 580 to 680 nm, and having a high emission intensity, and having a flat excitation band with high efficiency for excitation light in a broad wavelength range from ultraviolet to visible light (wavelength range from 250 nm to 550 nm). For example, Ca3N2(2N), AlN(3N), Si3N4(3N), Eu2O3(3N) are prepared, and after weighing and mixing a predetermined amount of each raw material, raw materials are fired at 1500 DEG C. for 6 hours, thus obtaining the phosphor including a product phase expressed by a composition formula CaAlSiN3: Eu and having an X-ray diffraction pattern satisfying a predetermined pattern.

Description

technical field [0001] The present invention relates to phosphors used in display devices such as CRTs, PDPs, FEDs, and ELs, lighting devices such as fluorescent kinescopes and fluorescent lamps, methods for producing them, and light sources using the phosphors. Background technique [0002] Discharge fluorescent lamps, incandescent bulbs, and the like currently used as lighting devices have various problems in that they contain harmful substances such as mercury and have a short lifespan. However, in recent years, LEDs emitting blue and ultraviolet light have been gradually developed. By combining phosphors having excitation bands in the ultraviolet-blue light and ultraviolet-green wavelength regions generated from the LED, the phosphors emit white light. Research and development on whether or not this white light can be utilized as next-generation lighting is actively underway. Since the white LED lighting generates less heat and is composed of semiconductor elements and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCY02B20/181
Inventor 坂根坚之永富晶后藤昌大山下修次
Owner CITIZEN ELECTRONICS CO LTD
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