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Stable green fluorescence powder and plasma displaying panel using the same

A phosphor, green light technology, applied in the field of lanthanide aluminate phosphors, can solve the problem of not describing lanthanide aluminate phosphors, etc.

Inactive Publication Date: 2007-09-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, neither of these patents and publications describe green-emitting manganese and alkali metal activated lanthanide aluminate phosphors according to the present invention.

Method used

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  • Stable green fluorescence powder and plasma displaying panel using the same
  • Stable green fluorescence powder and plasma displaying panel using the same
  • Stable green fluorescence powder and plasma displaying panel using the same

Examples

Experimental program
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Effect test

preparation example Construction

[0074] As mentioned above, the preparation method of the fluorescent powder comprises the following steps:

[0075] mixing a source of alkali metals, a source of manganese, a source of lanthanides and a source of aluminum in an acidic medium to form a dilute aqueous solution;

[0076] removing at least a portion of the water in the diluted aqueous solution to form a gel;

[0077] converting the gel to a gel powder by heating the gel at a temperature sufficient to remove excess water; and

[0078] Thermally decomposing the gel powder at a sufficient temperature and for a sufficient period of time to prepare a phosphor.

[0079] The present invention also provides a method for preparing green-emitting manganese and alkali metal-activated lanthanide aluminate fluorescent powder without a solvent. The fluorescent powder has the following empirical formula:

[0080] ln (2-x-y) B 22 o 36 :Mn x .A y

[0081] Where: Ln is a lanthanide metal selected from: La, Y, Gd, Tb and com...

example 1

[0133] This example describes the preparation of Mn and Li activated lanthanide aluminate phosphors by solid state reaction.

[0134] First, 28 grams of γ (80%-95%)-α (5%-20%) alumina (0.01-0.02μm powder), 18 grams of lanthanum oxalate, 0.63 grams of magnesium fluoride (divalent), 0.64 gram of lithium fluoride was mixed in a mortar and transferred to a high-grade alumina crucible. The crucible was covered and fired at 450°C. The fired material was mixed again in a mortar and transferred to a high-grade alumina crucible, and then calcined in a box furnace at 1200°C-1500°C for 2-4 hours. Subsequently, the samples were further fired at 1100° C.-1300° C. for 2-4 hours in forming gas (4.5% hydrogen + 95.5% nitrogen) in a tube furnace.

[0135] The samples were kept in the furnace with forming gas until cooled to room temperature. After cooling, these fine phosphor powders were ultrasonically stirred in water. Sonication helps break up agglomerates into individual particles. Af...

example 2

[0138] Except that 18 grams of lanthanum oxalate were replaced by 15 grams of lanthanum oxalate and 4.2 grams of gadolinium oxalate, the preparation process was the same as in Example 1.

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Abstract

The invention relates to a kind of lanthanum aluminate phosphor of alkaline manganese metal halide activation which is used for a plasma display panel (PDP) with green emission, and its mixture preparing. The phosphor has following formula: Ln (2-x-y) B22O36: Mnx.Ay, in which: Ln is selected from: La, Y, Gd, Tb, and their combinations of lanthanide metal, in which, La: 0.57 <= La <= 1. 782, and Y: 0 <= Y <= 0.19, and Gd: 0.198 <= Gd <= 0.95, and Tb: 0 <= Tb <= 0.19. A is selected from Li, Na, K, and their combinations. B is selected from Al and the combination of Al and Ga, in which, 0.01 <= x <= 0.1, and 0.01 <= y <= 0.1. When the phosphors are excited by the radiation of 147nm and 173nm of different composition of xenon gas mixture, the phosphors has energy band emission in the green region, and it reachs the peak at 515nm.

Description

technical field [0001] The present invention relates to the preparation and growth of small particle size, doped Mn by solid state and sol-gel methods 2+ and alkali halide lanthanide aluminate phosphors. More specifically, the present invention provides a stable green-emitting doped Mn 2+ Lanthanide aluminate phosphor powder of alkali metal halide and preparation method thereof. In order to improve brightness, other terbium-activated green-emitting phosphors, such as lanthanide borate, lanthanide phosphate or cerium magnesium aluminate, are mixed into the phosphor of the present invention. Background technique [0002] As a medium for large-screen televisions (60" and above), especially high-definition television (HDTV), plasma display panels (PDPs) are favored over cathode ray tube (CRT)-based ones due to their high performance and scalability. The concern of TV. Although CRT consumes less power and has better image quality, it has a size limit. Large screens (CRT) with ...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01J17/04
Inventor P·R·拉维利塞蒂
Owner PANASONIC CORP
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