JP2001181623A - Fluorescent material for light-emitting element excitable by vacuum ultraviolet ray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a blue fluorescent material for light-emitting element excitable by vacuum ultraviolet rays such as plasma display panel having high light- emission efficiency and provide a light-emitting element excitable by vacuum ultraviolet rays and produced by using the fluorescent material. SOLUTION: The present invention relates to (1) a fluorescent material for light-emitting element excitable by vacuum ultraviolet rays and produced by adding Eu as a dopant to a compound substrate containing SrO, Al2O3 and B2O3, (2) a fluorescent material for light-emitting element excitable by vacuum ultraviolet rays described in the term (1) and expressed by the general formula Sr1-aEuaAl2B2O7 (0.003<=a<=0.5) and (3) a light-emitting element excitable by vacuum ultraviolet rays and containing the fluorescent material described in the term (1) or (2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor suitable for a vacuum ultraviolet ray excited light emitting device such as a plasma display panel (hereinafter referred to as "PDP") and a rare gas lamp, and a vacuum ultraviolet device using the phosphor. It is.

[0002]

2. Description of the Related Art In recent years, a vacuum ultraviolet ray excited light emitting device having a structure in which a phosphor is excited by vacuum ultraviolet light radiated by rare gas discharge has been actively developed. A typical example is the development of PDPs. Since a PDP can have a large and thin screen, a cathode ray tube (CR)
Attention has been paid to flat panel displays that can replace T). A PDP is a display element in which a large number of minute discharge spaces (hereinafter, may be abbreviated as “display cells”) are arranged in a matrix, and a discharge electrode is provided in each display cell, and an inner wall of each display cell is provided. Is coated with a phosphor. He-Xe, Ne-X
A rare gas such as e or Ar is sealed, and when a voltage is applied to the discharge electrode, discharge of the rare gas occurs in the display cell, and vacuum ultraviolet rays are emitted. The phosphor is excited by the vacuum ultraviolet rays, and emits visible light. An image is displayed by light emission of the phosphor of the display cell at a predetermined position of the display element. As the phosphor used for each display cell,
A full-color display can be performed by using phosphors that emit blue, green, and red, and applying these in a matrix.

Recently, there has been a tendency to reduce harmful mercury due to environmental problems, and a rare gas lamp that emits vacuum ultraviolet rays by discharging only a rare gas without using mercury and excites a phosphor to emit light has attracted attention. ing.

In recent years, phosphors that emit light by being excited by vacuum ultraviolet rays or the like radiated by rare gas discharge have been actively developed. For example, for PDPs, BaMgAl ₁₀ O ₁₇ : Eu is used as a blue light emitting phosphor, Zn ₂ SiO ₄ : Mn is used as a green light emitting phosphor, and (Y, Gd) BO ₃ : Eu is used as a red light emitting phosphor. I have. However, in order to improve the characteristics of a full-color PDP,
Improvements in the luminance, color purity, and life of the phosphor have been desired. In particular, for a blue light emitting phosphor, it is desired to greatly improve the luminance and the life.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a blue phosphor for a vacuum ultraviolet excitation element such as a PDP, which has good luminous efficiency, and a vacuum ultraviolet excitation element using the same.

[0006]

Means for Solving the Problems The present inventors have set forth the above section.
As a result of intensive research to solve the problem, SrO-Al _Two
O_Three-B_TwoO_ThreeEu in the three-component host crystal system²⁺Ion
The activated phosphor was found to be useful, and
It was completed.

That is, the present invention provides the following (1) to (3)
It is about. (1) A phosphor for a vacuum ultraviolet ray excited light emitting device, wherein Eu is added as an activator to a compound substrate containing SrO, Al ₂ O ₃ and B ₂ O ₃ . (2) General formula Sr _1-a Eu _a Al ₂ B ₂ O ₇ (however, 0.0
03 ≦ a ≦ 0.5). The phosphor for a vacuum ultraviolet ray excited light emitting device according to the above (1), which is represented by the following formula: (3) A VUV-excited light-emitting device comprising the phosphor according to (1) or (2).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The phosphor for a vacuum ultraviolet ray excited light emitting device of the present invention has the formula S
E as an activator for a compound substrate represented by rAl ₂ B ₂ O ₇
is a blue light emitting phosphor to which u is added, but when Eu (Eu ²⁺ ion) is added as an activator, the general formula Sr
_1-a Eu _a Al ₂ B ₂ O ₇ (provided that 0.003 ≦ a ≦ 0.
The phosphor for a vacuum ultraviolet ray excited light emitting element represented by 5) is preferable.

Further, the phosphor for a vacuum ultraviolet excitation device of the present invention can be applied to a phosphor excited by ultraviolet rays, X-rays and electron beams other than the vacuum ultraviolet region, and an element using the same.

The method of producing (synthesizing) the phosphor according to the present invention is not particularly limited. For example, it is produced by blending the respective phosphor materials so as to have a predetermined component composition as described below. You. Aluminum raw materials include high-purity (99.9% or more) α-alumina, γ-alumina or similarly high-purity (99% or more) aluminum hydroxide, nitrate, halide, and the like. Boron oxide, boric acid and the like are used. Strontium raw materials include high-purity (99% or more) oxides and high-purity (99% or more) hydroxides, carbonates, nitrates, halides, oxalates, and other high-temperature oxides. Can be used.

As a raw material of europium, which is an activator for causing the phosphor to emit light, a high-purity (99% or more) oxide, a high-purity (99% or more) hydroxide, carbonate Salts, nitrates, halides, oxalates, and the like that can be decomposed at high temperatures to become oxides can be used.

The raw materials are mixed using a ball mill, a V-type mixer, a stirrer, or the like, and then heated at 900 ° C. to 11 ° C.
Baking is performed for several hours to several tens of hours in the range of 00 ° C. to obtain a phosphor. Raw materials include hydroxides, carbonates, nitrates, halides,
When an oxalate or the like that can be decomposed at a high temperature to become an oxide is used, it is also possible to calcine at 600 to 800 ° C. before the main firing. The firing atmosphere at this time is preferably a weakly reducing atmosphere in order to stably generate divalent Eu. Also, an appropriate amount of flux may be added to promote the firing reaction.

Further, the product obtained by the above method is crushed using a ball mill, a jet mill or the like, and then washed, but classified if necessary. Further, in order to further enhance the crystallinity of the obtained phosphor, re-firing is performed as necessary.

According to the invention described above, when used in a vacuum ultraviolet ray excited light emitting device such as a PDP and a rare gas lamp, a suitable phosphor can be obtained with high light emission intensity.

[0015]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 Aluminum hydroxide Al (OH) ₃ [manufactured by Kojundo Chemical Laboratory, 99.9% or more] 15.6 g, strontium carbonate [manufactured by Wako Pure Chemical Industries, Ltd., special grade of reagent] 14.0
g, boron oxide B ₂ O ₃ [manufactured by Wako Pure Chemical Industries, Ltd.];
0 g, europium oxide 8.8 g [Wako Pure Chemical Industries, Ltd.
And reagent grade) were weighed and crushed and mixed in an agate mortar for 1 hour. A mixed gas of nitrogen and hydrogen [(nitrogen (volume ratio): hydrogen (volume ratio)] on an alumina boat with a platinum plate
= 9: 1] In a reducing atmosphere, it was calcined at 900 ° C for 12 hours, and then gradually cooled to room temperature. Using a powder X-ray diffractometer, it was found that a single phase of SrAl ₂ B ₂ O ₇ : Eu ²⁺ (5 mol%) was formed. 5 × 10 ^-2 Tor
The excimer 146 is applied to the obtained phosphor in a vacuum layer of r or less.
When irradiated with ultraviolet rays using a nm lamp (manufactured by Ushio Inc.), a strong blue-violet light was emitted.

[0017]

According to the present invention, when used in a vacuum ultraviolet ray excited light emitting device such as a PDP and a rare gas lamp, a high emission intensity, a suitable phosphor can be obtained, and a high brightness vacuum ultraviolet excited light emitting device can be realized. It is extremely useful industrially.

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Claims (3)

[Claims] 1. A phosphor for a VUV-excited light emitting device, wherein Eu is added as an activator to a compound substrate containing SrO, Al ₂ O ₃ and B ₂ O ₃ . 2. A compound of the general formula Sr _1-a Eu _a Al ₂ B ₂ O ₇ (provided that
2. The phosphor for a VUV-excited light emitting device according to claim 1, wherein the phosphor is represented by the formula: 0.003 ≦ a ≦ 0.5). 3. A VUV-excited light emitting device comprising the phosphor according to claim 1 or 2.