Phosphor for vacuum ultravilet ray-excited light-emitting element

A technology of vacuum ultraviolet rays and light-emitting elements, which is applied in the directions of light-emitting materials, fluorescent layers, gas discharge electrodes, etc., and can solve the problems such as the decline of the brightness of phosphors

Inactive Publication Date: 2004-05-26
SUMITOMO CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional phosphors have the problem that the brightness of the phosphor decreases after exposure to p

Method used

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  • Phosphor for vacuum ultravilet ray-excited light-emitting element
  • Phosphor for vacuum ultravilet ray-excited light-emitting element

Examples

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example

[0044] The present invention is explained in more detail with the following examples, which should not be construed as limiting the invention in any way.

[0045] The composition of the phosphor was analyzed in the following manner. A sample of the phosphor was taken out and melted by alkali fusion with sodium carbonate and boric acid as fluxes. Water and hydrochloric acid are added to the molten sample to obtain a solution. The solution was analyzed using inductively coupled plasma atomic emission spectrometry, and the target element was quantitatively determined.

[0046] The brightness measurement of the phosphor was performed in the following manner. The phosphor is placed in a vacuum maintained at 6.7Pa (5×10 -2 torr) or lower, and measured by vacuum ultraviolet ray irradiation using a lamp (model H0012 produced by Ushio Inc.) that excites atoms at 146 nm. Also, the phosphor was heat-treated at 500°C for 30 minutes in air, and then the luminance was measured in the sa...

example 1

[0048] Production of LaMg 0.95 mn 0.05 Al 11 o 19 (comply with the compound of molecular formula (I): M 1 1-a-b-c-d m 2 a m 3 b m 4 1-e m 5 11-f m 6 c+d+e+f o 19-(b+c+f) / 2 , where M 1 It's La, M 4 is Mg, M 5 is Al, M 6 is Mn, a=0, b=0, c=0, d=0, e=0.05, f=0):

[0049] Lanthanum oxide (purity: 99.99%; manufactured by Shin-Etsu Chemical Co., Ltd.), basic magnesium carbonate (purity: 99% or more; manufactured by Kyowa Chemical Industry Co., Ltd.), aluminum hydroxide (purity: 99% or higher; produced by Sumitomo Chemical Co., Ltd.) and manganese carbonate (purity: 99.9%; produced by Wako Pure Chemical Industries, Ltd.) according to La 2 o 3 :(MgCO 3 ) 4 Mg(OH) 2 ·5H 2 O:Al 2 o 3 : MnCO 3 = 2.13: 1.21: 7.33: 0.075 Weighing so that the molar ratio La: Mg: Al: Mn = 1.0: 0.95: 11.0: 0.05, these materials were mixed with isopropanol as a solvent using a wet ball mill for 4 hours. The solvent in the slurry was removed with an evaporator, and the slurry was dr...

example 2

[0051] Production La 0.9 Y 0.1 Mg 0.95 mn 0.05 Al 11 o 19 (comply with the compound of molecular formula (I): M 1 1-a-b-c-d m 2 a m 3 b m 4 1-e m 5 11-f m 6 c+d+e+f o 19-(b+c+f) / 2 , where M 1 It's La 0.9 Y0.1 ,M 4 is Mg, M 5 is Al, M 6 is Mn, a=0, b=0, c=0, d=0, e=0.05, f=0):

[0052] The same procedure as Example 1 was carried out except that lanthanum oxide (purity: 99.99%; produced by Shin-Etsu Chemical Co., Ltd.), yttrium oxide (purity: 99.99%; produced by Shin-Etsu Chemical Co., Ltd.), Basic magnesium carbonate (purity: 99% or more; produced by Kyowa Chemical Industry Co., Ltd.), aluminum hydroxide (purity: 99% or more; produced by Sumitomo Chemical Co., Ltd.), and manganese carbonate (purity: 99.9% %; Wako Pure Chemical Industries, Ltd. production) according to La 2 o 3 : Y 2 o 3 :(MgCO 3 ) 4 Mg(OH) 2 ·5H 2 O:Al 2 o 3 : MnCO 3 =1.93:0.15:1.21:7.37:0.076 Weighed so that the molar ratio La:Y:Mg:Al:Mn=0.9:0.1:0.95:11.0:0.05. Under vacuum u...

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Abstract

A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I): <?in-line-formulae description="In-line Formulae" end="lead"?>M11-a-b-c-dM2aM3bM41-eM511-fM6c-d+e+fO19-(b+c+f)/2 (I)<?in-line-formulae description="In-line Formulae" end="tail"?> (wherein M1 is at least one element selected from the group consisting of La, Y and Gd, M2 is at least one element selected from the group consisting of Ce and Tb, M3 is at least one element selected from the group consisting of Ca, Sr and Ba, M4 is at least one element selected from the group consisting of Mg and Zn, M5 is at least one element selected from the group consisting of Al and Ga, and M6 is at least one element selected from the group consisting of Mn and Eu, and a, b, c, d, e and f are numbers satisfying the conditions of 0<=a<1, 0<=b<=0.6, 0<=c<=0.5, 0<=d<=0.5, 0<=e<1, 0<=f<1, a+b+c+d<1 and 0<c+d+e+f), respectively.

Description

technical field [0001] The present invention relates to a phosphor suitable for a vacuum ultraviolet excitation light emitting element such as a plasma display panel (hereinafter referred to as "PDP") and a rare gas lamp and a vacuum ultraviolet excitation light emitting element using the phosphor. Background technique [0002] Phosphors are used in vacuum ultraviolet excitation light-emitting elements such as plasma display panels and rare gas lamps, and phosphors that emit light using vacuum ultraviolet excitation are known. Among these phosphors, such as aluminate phosphors, blue-emitting phosphors BaMgAl 10 o 17 :Eu and green-emitting phosphor BaAl 12 o 19 :Mn is already in use. Moreover, aluminate phosphors used in vacuum ultraviolet excitation light-emitting elements, Ba as green-emitting phosphors 0.83 Al 11.9 mn 0.05 o 18.73 (see JP-A-10-1666 for example) or CeMgAl 11 o 19 : Tb (see for example "Phosphor Handbook" edited by the Phosphor Research Society, p....

Claims

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Application Information

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IPC IPC(8): C09K11/78C09K11/77C09K11/80H01J11/22H01J11/34H01J11/42H01J61/44
CPCH01J61/44C09K11/7774C09K11/7706C09K11/77
Inventor 今成裕一郎槐原隆义宫崎进
Owner SUMITOMO CHEM CO LTD
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