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[beta]-sialon phosphor powder and process for production of the same

A silicon-aluminum-oxynitride ceramic and a manufacturing method technology, which are applied in the direction of discharge tube fluorescent screen, chemical instruments and methods, luminescent materials, etc., can solve problems such as application difficulties and the like

Active Publication Date: 2010-09-01
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the phosphor disclosed in JP-A-60-206889, it is difficult to apply it because the optimal excitation wavelength exists in the ultraviolet region.

Method used

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  • [beta]-sialon phosphor powder and process for production of the same
  • [beta]-sialon phosphor powder and process for production of the same
  • [beta]-sialon phosphor powder and process for production of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]First, α-type silicon nitride necessary for the present invention is fabricated. The law is described below. Silicon tetrachloride was reacted with ammonia to produce silicon diimide, which was pyrolyzed at 1100° C. under a nitrogen atmosphere to obtain amorphous silicon nitride powder. Put the amorphous silicon nitride in a carbon crucible, and raise the temperature from room temperature to 1200°C in 1 hour, from 1200°C to 1400°C at 20°C / h, and from 1400°C to 1500°C in 1 hour. 1500°C for 1 hour. The obtained α-type silicon nitride particles are shown in Figure 1A . The particle diameter is 5.6-8.0 μm, and the aspect ratio (ratio of major axis / short axis) is 1.0-1.2.

[0044] Using this silicon nitride, weigh silicon nitride powder, aluminum nitride powder, aluminum oxide powder, and europium oxide powder, put them in a polyethylene tank, and mix them with a vibration mill for 1 hour to make the composition Si 5.631 Al 0.369 o 0.369 N 7.631 Eu 0.0244 . The resu...

Embodiment 2～3

[0049] A β-sialon phosphor was produced in the same manner as in Example 1 except that the particle size of the α-silicon nitride used was changed.

[0050] The results are shown in Table 1. The form of the raw material α-type silicon nitride of Example 2 is shown in Figure 2A , In addition, the obtained β-sialon ceramic phosphor such as Figure 2B shown.

Embodiment 4

[0052] Put 1 g of the β-sialon ceramic obtained in Example 1 and 50 g of 2 N nitric acid solution into a beaker, and stir for 5 hours. Then, the liquid was filtered and washed with water, and the residue was collected and dried at 120°C. The fluorescent properties of this powder are shown in Table 1. Fluorescence intensity was enhanced by acid washing.

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Abstract

The invention provides a ss-sialon phosphor exhibiting higher luminance which is usable in vacuum fluorescent displays (VFD), field emission displays (FED), plasma display panels (PDP), cathode ray tubes (CRT), light emitting diodes (LED), and so on. A novel high-luminance ss-sialon phosphor powder having an average aspect ratio of less than 1.5 can be obtained by mixing a-silicon nitride particles having particle diameters of 2[mu]m or above and an average aspect ratio of 1.3 or below with an AlN-containing aluminum source substance and either an oxide of metal Ln or a precursor capable of being converted into the oxide through pyrolysis in such a way as to give a composition represented by the general formula: Si6-zAlzOzN8-z:Lnx (wherein 0<z<4.2 and Ln is Eu) and firing the obtained mixture in a nitrogen atmosphere under a pressure of 0.05 to 100MPa at 1700 to 2100 DEG C.

Description

[0001] Description of the relevant application [0002] This application is based on and claims priority from Japanese Patent Application No. 2007-264007 filed with the Japan Patent Office on October 10, 2007, and the disclosure of Japanese Patent Application No. 2007-264007 is incorporated herein by reference. technical field [0003] The present invention relates to a β-Si 3 N 4 Crystal structure β-sialon ceramic phosphor powder, its manufacturing method and its use. Specifically, it relates to a phosphor powder containing rare earth-activated β-sialon ceramic phosphor particles having a special particle shape with improved fluorescence intensity, a method for producing it, and its use. Background technique [0004] The β-sialon ceramic phosphor activated by rare earth elements has been disclosed in JP-A-60-206889. These β-sialon ceramic phosphors emit green fluorescence at 525nm to 545nm when excited by ultraviolet light below 315nm. In recent years, research has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64C09K11/08H01J1/63H01L33/00H01L33/50
CPCC01P2004/54C04B2235/3865C04B35/597C04B2235/46C09K11/0883C04B2235/3878C04B2235/3217C04B35/6268C01B21/0826C01P2002/54C01P2004/61C04B2235/5296C04B2235/767C01P2002/30C04B2235/465H01L33/502C04B2235/3224C04B2235/5436C01P2006/60C09K11/7734C09K11/77348C09K11/77347H05B33/14
Inventor 酒井拓马坂田信一
Owner DENKA CO LTD
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