Complex oxynitride phosphor, light-emitting device using same, image display, illuminating device, phosphor-containing composition and complex oxynitride

a technology of complex oxynitride and phosphor, which is applied in the direction of discharge tube/lamp details, luminescent compositions, and discharge tubes luminescnet screens, etc., can solve the problems of low emission efficiency decrease, insufficient conversion efficiency of blue or near-ultraviolet light, and insufficient green phosphors. , to achieve the effect of high power, low emission efficiency and high efficiency

Inactive Publication Date: 2009-02-05
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0052]The multinary oxynitride phosphor of the present invention is a green phosphor that can be excited efficiently, particularly with a semiconductor luminous element emitting light of near ultraviolet or blue, and of which peak wavelength of the emission spectrum is around 525 nm. In addition, in the multinary oxynitride phosphor of the present invention, the decrease in emission efficiency accompanying temperature rising is usually small, compared to a YAG:Ce phosphor which is often used for a conventional white light emitting device.
[0053]The multinary oxynitride phosphor of the present invention can be widely used in such fields as illuminating device or display. Among them, it can be suitably used for an LED lamp of a general illuminating device, and particularly suitably for a white, back-lighting LED of high power, high brightness and broad range of color reproduction. The light emitting device of the present invention has high emission efficiency, less decrease in emission efficiency accompanying temperature rising, high brightness and broad range of color reproduction.
[0054]Further, the multinary oxynitride of the present invention is excellent in acid stability and high-temperature stability, and therefore it is used preferably as a heat-resistant material.

Problems solved by technology

In addition, it is preferable for it to be low in decrease of emission efficiency, accompanying temperature rising of the light emitting device, and also in color shift.
However, existing green phosphors are insufficient either in conversion efficiency of blue or near-ultraviolet light or in color purity.

Method used

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  • Complex oxynitride phosphor, light-emitting device using same, image display, illuminating device, phosphor-containing composition and complex oxynitride
  • Complex oxynitride phosphor, light-emitting device using same, image display, illuminating device, phosphor-containing composition and complex oxynitride
  • Complex oxynitride phosphor, light-emitting device using same, image display, illuminating device, phosphor-containing composition and complex oxynitride

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example

[0562]In the following, the present invention will be explained in more detail using Examples. It is to be understood that the present invention is by no means limited by the following examples insofar as they do not depart from the intent of the invention.

[1. Method for Measurement and Evaluation of Phosphor]

[0563]Various evaluations of phosphor particles were carried out by the following methods in each Example and Comparative Example to be described later.

[0564][Method for Measuring Emission Spectrum]

[0565]The emission spectrum was measured by using a fluorescence measurement apparatus (manufactured by JASCO corporation) equipped with an excitation light source of 150-W xenon lamp and a spectrum measurement apparatus of multichannel CCD detector, C7041 (manufactured by Hamamatsu Photonics K.K.). The light from an excitation light source was passed through a grating monochromator with focal length of 10 cm to separate a light having wavelength of 340 nm, 400 nm or 455 nm, and the ...

production examples 1 to 12

[0617]Each of BaCO3, SiO2, Si3N4 and Eu2O3 was used in the amount shown in Table 1, in order to realize a nominal chemical composition ratio shown in Table 2, and mixing and firing were performed.

TABLE 1[Table 1: Amounts of materials used]Production ExampleBaCO3SiO2Si3N4Eu2O313.08 g1.89 g0.00 g0.03 g22.83 g1.74 g0.41 g0.03 g32.62 g1.61 g0.75 g0.02 g42.52 g1.55 g0.91 g0.02 g52.43 g1.49 g1.05 g0.02 g62.27 g1.40 g1.31 g0.02 g72.14 g1.31 g1.53 g0.02 g82.01 g1.24 g1.73 g0.02 g91.90 g1.17 g1.91 g0.02 g101.80 g1.11 g2.070.02 g111.71 g1.05 g2.22 g0.02 g121.63 g1.01 g2.25 g0.02 g

TABLE 2[Table 2: Nominal chemical composition ratio]Nominal chemical compositionFiring conditionProduction Example 1B0.99Eu0.01Si2O51600° C. 2 hr + 1800° C. 2 hrProduction Example 2B0.99Eu0.01Si2.6N0.4O51600° C. 2 hr + 1800° C. 2 hrProduction Example 3B0.99Eu0.01Si3.2N1.6O51600° C. 2 hr + 1800° C. 2 hrProduction Example 4B0.99Eu0.01Si3.5N2O51600° C. 2 hr + 1800° C. 2 hrProduction Example 5B0.99Eu0.01Si3.8N2.4O51600° ...

examples 1 to 13 , 18 and examples 35 to 38

Examples 1 to 13, 18 and Examples 35 to 38

[0620]Each of BaCO3, SrCO3 (manufactured by Hakushin Chemical Laboratory Co, Ltd.), CaCO3 (manufactured by Hakushin Chemical Laboratory Co, Ltd.), SiO2, Si3N4 and Eu2O3 was weighed out so as to give a nominal chemical composition ratio shown in Table 3, and mixing / firing was performed in the same manner as described for Production Examples 1 to 12. Namely, in Example 1, 2.52 g of BaCO3, 1.55 g of SiO2, 0.91 g of Si3N4 and 0.02 g of Eu2O3 were used. In Example 2, 2.29 g of BaCO3, 0.10 g of SrCO3, 1.57 g of SiO2, 0.91 g of Si3N4 and 0.14 g of Eu2O3 were used. In each of other Examples, according to each composition ratio, the proportion was varied based on the above-mentioned charge amount.

[0621]X-ray diffraction patterns of the fired products obtained are shown in FIG. 7. In each of Examples 1 to 7, 8 to 12 and 18, BSON crystal phase was detected as the main phase. It is evident that, when 40 atom % or more of Ba is replaced with Ca, BSON-pha...

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Abstract

To provide a green phosphor with high conversion efficiency of blue of near-ultraviolet light and excellent color purity, a multinary oxynitride phosphor represented by the general formula [I] is proposed.
M1xBayM2zLuOvNw  [I]
In the formula [I], M1 represents Cr, Mn, Fe, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, M2 represents Sr, Ca, Mg and Zn, L represents metal elements belonging to the fourth group or the fourteenth group of the periodic table, and x, y, z, u, v and w are the numeric values in the following ranges:
0.00001≦x≦3
0≦y≦2.99999
2.6≦x+y+z≦3
0<u≦11
6<v≦25
0<w≦17.

Description

TECHNICAL FIELD[0001]The present invention relates to a multinary oxynitride phosphor, and a light emitting device, image display, illuminating device and phosphor-containing composition using the same, and a multinary oxynitride. More particularly, it relates to a multinary oxynitride phosphor emitting green light when irradiated with light from an excitation light source such as a semiconductor luminous element, which serves as a first luminous body, and a high-efficiency light emitting device, image display, illuminating device and phosphor-containing composition using the same, and a multinary oxynitride.BACKGROUND ART[0002]Though nitrides are inferior to oxides in stability or facilitation of production, not a few of them are known to have characteristics which oxides or other inorganic compounds do not have. Actually, such binary system nitrides as Si3N4, BN, AlN, GaN and TiN are used for various purposes such as substrate material, semiconductor, light-emitting diode (hereina...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62C01F17/00C01B21/20C09K11/54C09K11/55C09K11/78H01L33/50H01L33/56H01L33/62
CPCC09K11/0883C09K11/7734H01L2924/30107H01L2224/45124H01L2224/45015H01L24/45H01L2224/48247H01L2224/48091H01L2224/45144H01L33/502H01L2924/00014H01L2924/00H01L2924/20752H01L2924/20753H01L2924/12042H01L2924/12044H01L2924/12041H01L2924/181C09K11/77347C09K11/77342C09K11/77348H01L2924/00012C09K11/77
Inventor SHIMOOKA, SATOSHIUEDA, KYOTAMIKAMI, MASAYOSHIKIJIMA, NAOTOIMURA, HIROYUKIHORIBE, KENTARO
Owner MITSUBISHI CHEM CORP
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