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Nitride phosphor and method of producing same

A manufacturing method and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as brightness reduction, and achieve the effect of improving internal quantum efficiency and external quantum efficiency

Inactive Publication Date: 2014-07-23
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the YAG phosphor is used at a high output power, it has the following problems: if the temperature of the phosphor rises, the luminance decreases, that is, the so-called thermal quenching is large; if a more excellent color reproduction range and color rendering When excited by light around 350-420nm, the brightness is significantly reduced

Method used

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  • Nitride phosphor and method of producing same
  • Nitride phosphor and method of producing same
  • Nitride phosphor and method of producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0220] (blending of raw materials)

[0221] With La:Si=3:6 (molar ratio) and CeF 3 / (alloy+Si 3 N 4 )=6wt% mode weighing La:Si=1:1 (molar ratio) alloy, Si 3 N 4 , CeF 3 . After mixing the weighed raw materials with a ball mill, pass through the sieve holes of the nylon sieve to blend the raw materials. It should be noted that the work from weighing to blending was carried out in a glove box with an oxygen concentration of 1% or less in a nitrogen atmosphere, and the double-duty process of putting a plastic tank filled with nitrogen into an airtight container also filled with nitrogen was carried out. In the state of the container, the ball mill was carried out in the atmosphere. As the media (balls) of the ball mill, nylon-coated iron balls were used.

[0222] (Firing process)

[0223]The prepared raw materials were filled into a Mo crucible and placed in an electric furnace. After vacuuming the device, raise the temperature in the furnace to 120°C, and after confirm...

Embodiment 2

[0229] Phosphor 2 was obtained in the same manner as in Example 1 except that the time for pulverizing the fired phosphor in the cleaning step was changed to obtain the particle diameters shown in Table 1. Table 1 shows the chromaticity coordinates, luminance, and particle diameters of the obtained phosphors. In addition, the value obtained by converting the obtained infrared absorption spectrum into the Kubelka-Munck function is shown in figure 2 .

Embodiment 3

[0231] In the mixing with a ball mill in the preparation of raw materials, the medium was changed to zirconia balls, and the time for pulverizing the fired phosphor in the cleaning process was changed to obtain the particle diameters shown in Table 1, except Other than that, it carried out similarly to Example 1, and obtained the phosphor 3. Table 1 shows the chromaticity coordinates, luminance, and particle diameters of the obtained phosphors. In addition, the value obtained by converting the obtained infrared absorption spectrum into the Kubelka-Munck function is shown in image 3 .

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Abstract

The purpose of the present invention is to provide a nitride phosphor with higher-than-conventional brightness, internal quantum efficiency, and external quantum efficiency. This nitride phosphor is represented by general formula (1) below, and is characterized in that the infrared absorption spectrum, measured by the diffuse reflection method with at least a 2cm-1 or lower measurement interval, satisfies prescribed conditions. LnxSiyNn:Z (1) (In general formula (1), Ln is a rare earth element excluding elements used as activators, Z is an activator, x satisfies 2.7<= x<= 3.3, y satisfies 5.4 <= y <= 6.6, and n satisfies 10 <= n <= 12.)

Description

technical field [0001] The present invention relates to nitride phosphors, and more specifically, to phosphors excellent in luminance, internal quantum efficiency, and external quantum efficiency. Background technique [0002] In recent years, demand for lighting and backlights using LEDs has been increasing due to energy-saving trends. The LED used here is a white light-emitting LED in which a phosphor is arranged on an LED chip emitting light of a blue or near-ultraviolet wavelength. As this type of white light-emitting LED, a blue LED chip using a YAG (yttrium aluminum garnet) phosphor that emits yellow light by using blue light from the blue LED chip as excitation light is often used. [0003] However, when the YAG phosphor is used at a high output power, it has the following problems: if the temperature of the phosphor rises, the luminance decreases, that is, the so-called thermal quenching is large; if a more excellent color reproduction range and color rendering Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79C09K11/08
CPCC09K11/0883C09K11/7766
Inventor 高阶志保大户章裕金度勋
Owner MITSUBISHI CHEM CORP
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