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Fluorescent substance, method for production of the same, and light-emitting device using the same

A manufacturing method and a technology of a light-emitting device, which are applied in the field of phosphors and can solve problems such as reduction in brightness of phosphors

Active Publication Date: 2010-06-23
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as a result of exposure of the phosphor to the above-mentioned excitation source, there is a problem that the luminance of the phosphor decreases, so a phosphor without a decrease in luminance is required

Method used

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  • Fluorescent substance, method for production of the same, and light-emitting device using the same
  • Fluorescent substance, method for production of the same, and light-emitting device using the same
  • Fluorescent substance, method for production of the same, and light-emitting device using the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ”

[0175] As the first embodiment of the lighting fixture of the present invention, for figure 1 The shown cannonball-shaped white light-emitting diode lamp (LED lighting fixture) 1 will be described.

[0176] A cannonball-shaped white light-emitting diode lamp 1 has a first lead 2 and a second lead 3. The first lead 2 has a recess 2a, and a blue light-emitting diode element 4 is mounted on the recess 2a. In the blue light-emitting diode element 4 , the lower electrode 4 a is electrically connected to the bottom surface of the concave portion 2 a with conductive paste, and the upper electrode 4 b is electrically connected to the bonding wire (gold thin wire) 5 through the second lead 3 .

[0177] The first resin 6 is a transparent resin in which phosphors 7 are dispersed, and covers the entirety of the blue light emitting diode element 4 . The end portion 2b of the first lead 2 including the concave portion 2a, the blue light emitting diode element 4, and the first resin 6 in wh...

no. 2 approach ”

[0183] As the second embodiment of the lighting fixture of the present invention, for figure 2 The illustrated board mounting chip-type white light-emitting diode lamp (LED lighting fixture) 11 will be described.

[0184] The chip-type white light-emitting diode lamp 11 for substrate mounting has a third lead 12 and a fourth lead 13 fixed on a ceramic substrate 19 made of white alumina ceramics with high reflectance of visible light, and their ends 12a and 13a are located at In the substantially central portion of the substrate, the ends 12b and 13b on the opposite side are respectively exposed to the outside, and serve as electrodes to be soldered when mounted on the electric substrate.

[0185] The end 12a of the third lead 12 has a built-in and fixed blue light-emitting diode element 14 so as to be located in the center of the substrate. The lower electrode 14 a of the blue light emitting diode element 14 is electrically connected to the third lead 12 by conductive paste,...

Embodiment 1～10

[0208] First, Examples 1 to 10 of the phosphor of the present invention will be described.

[0209] As raw material powders, silicon nitride powder, aluminum nitride powder, strontium nitride powder, and europium nitride powder having an average particle diameter of 0.5 μm, an oxygen content of 0.93% by weight, and an α-type content of 92% were used.

[0210] Coordination (mass ratio, hereinafter also in other examples) represented in Table 2 weighs europium nitride powder, strontium nitride powder, aluminum nitride powder, silicon nitride powder, so that in the general formula Sr x M(1) y M(2) z Si 12-(m+n) Al (m+n) o n N 16-n The values ​​of x, y, z, m, and n shown in Table 1 were used, and mixed for 30 minutes with an agate sucker and a mortar. In addition, M(1) is Eu.

[0211] Table 1

[0212]

x

y

z

m

n

Example 1

0.110

0.015

0.000

0.250

0.000

Example 2

0.235

0.015

...

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Abstract

Disclosed is a fluorescent substance having higher brightness than that of a conventional fluorescent substance. Also disclosed is a method for producing the fluorescent substance. Further disclosed is a light-emitting device which utilizes the fluorescent substance. Specifically, the fluorescent substance comprises at least an M(0) element [wherein M(0) represents one or two elements selected from Sr and La], an M(1) element [wherein M(1) represents at least one element selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb], Si, Al and nitrogen, has the same crystal structure as that of an a-type silicon nitride crystal, and comprises an alpha-sialon crystal structure.

Description

technical field [0001] The present invention relates to a phosphor mainly composed of an inorganic compound and its use. More specifically, this use relates to light-emitting devices such as lighting devices and display devices utilizing the property of the phosphor, that is, the characteristic of emitting fluorescence with a long wavelength of 550 nm or more. [0002] This application claims priority based on Patent Application No. 2007-135477 filed in Japan on May 22, 2007 and Patent Application No. 2008-079586 filed in Japan on March 26, 2008, the contents of which are incorporated herein by reference. Background technique [0003] Phosphors are being used in fluorescent display tubes (VFDs), field emission displays (FEDs), plasma display panels (PDPs), cathode ray tubes (CRTs), white light emitting diodes (LEDs), and the like. For any of these applications, in order to make the phosphor emit light, it is necessary to supply energy for exciting the phosphor to the phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64C09K11/08H01L33/00H01L33/50
CPCC04B2235/3206C04B35/6262C04B2235/3225C09K11/7728C04B35/62675C04B2235/5296C04B2235/3201C04B35/597C04B35/6268C04B2235/3878H01L2224/48091C04B2235/3215H01L2224/8592C04B2235/5445C04B2235/5436C04B2235/3208C04B2235/3213C09K11/0883C04B2235/3229H05B33/14C04B35/62685C04B2235/3262H01L2224/45144H01L33/502C04B2235/3227C04B2235/3873C04B2235/3203C04B2235/3865C04B2235/3895C04B2235/3224H01L2224/48247C04B2235/3891C04B2235/3852C04B2235/3205H01L2924/181Y10T428/265H01L2924/00014H01L2924/00H01L2924/00012H01L33/00
Inventor 盐井恒介广崎尚登
Owner NAT INST FOR MATERIALS SCI
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