Luminescent device

A technology of light-emitting devices and phosphors, which is applied in the direction of light-emitting materials, electrical components, chemical instruments and methods, etc., and can solve problems such as the inverse relationship between chromaticity change and brightness maintenance rate, degradation, sintering, etc.

Inactive Publication Date: 2008-03-26
PANASONIC CORP
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Problems solved by technology

[0005] However, in the methods described in JP-A-61-254689 and JP-A-2000-34478, although a certain inhibitory effect on thermal deterioration that may occur during manufacture is obtained, aging and accompanying image degradation cannot be sufficiently suppressed. Deterioration of characteristics due to vacuum ultraviolet ray irradiation at the time of display
[0006] In addition, even if the method described in JP-A-10-330746 is used, it is difficult to uniformly cover the phosphor with the oxide film of Sb itself, and there

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Embodiment Construction

[0018] The light-emitting device of the present invention is provided with a phosphor layer containing a blue phosphor, and the phosphor layer contains an aluminate phosphor as a constituent element having an atomic ratio of Ba:Sr:Eu:Mg. :Al:O=p:q:r:l:w:17 ratio (wherein, 0.70≤p≤0.95, 0≤q≤0.15, 0.05≤r≤0.20, p+q+r≥1, 9.8≤w ≤10.5) Contains Ba, Sr, Eu, Mg, Al and O.

[0019] In addition, the above-mentioned constituent elements may be contained in the crystal of the aluminate phosphor as long as they are contained in the crystal lattice, and may be located between the lattices.

[0020] Moreover, assuming that the aluminate phosphor belongs to the space group P6 3 / mmc, where the lattice constant obtained by X-ray crystallographic analysis is L a (A), the distance between atoms of Al(2) and O(5) is L 1 (A), the distance between atoms of Al(1) and O(4) is L 2 (A) situation, by s=-11622+2043.07L a +199.24L 1 -116.9L 2 The value of the linear combination function s indicated ...

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Abstract

This invention provides a luminescent device comprising a blue fluorescent substance-containing fluorescent substance layer. The fluorescent substance layer comprises, as a blue fluorescent substance, an aluminate fluorescent substance comprising Ba, Sr, Eu, Mg, Al and O as constituent elements at an atomic ratio of Ba : Sr : Eu : Mg : Al : O = p : q : r : 1 : w : 17, wherein 0.70 = p = 0.95, 0 = q = 0.15, 0.05 = r = 0.20, p + q + r = 1, and 9.8 = w = 10.5. When the aluminate fluorescent substance is subjected to X-ray crystal structure analysis on the assumption that the aluminate fluorescent substance belongs to a space group P63/mmc, the aluminate fluorescent substance has a linear bond function s of not more than 1 as calculated by s = -11622 + 2043.07La + 199.24L1 - 116.91L2 wherein La represents a lattice constant, AA; L1 represents atomic distance between Al(2) and O(5), AA; and L2 represents atomic distance between Al(1) and O(4), AA.

Description

technical field [0001] The present invention relates to a light emitting device containing an aluminate phosphor as a blue phosphor in a phosphor layer. Background technique [0002] As a blue phosphor for light-emitting devices such as plasma display panels (PDPs), BaMgAl 10 o 17 :Eu, (Ba, Sr)MgAl 10 o 17 Alkaline-earth aluminate phosphors activated with europium called so-called BAM:Eu such as :Eu (hereinafter, may be simply referred to as "aluminate phosphors") have attracted attention. This is because it has excellent visible light emission characteristics when excited by vacuum ultraviolet rays, compared with other blue phosphors. [0003] Phosphor layers such as PDPs are produced by mixing phosphors and binders to prepare slurry, applying the slurry to the surface of a substrate such as glass, and then baking it. [0004] However, when an aluminate phosphor is used, the wavelength conversion efficiency may deteriorate significantly over time depending on the usage...

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Application Information

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IPC IPC(8): C09K11/64H01J61/44H01J11/02
Inventor 坂井全弘白石诚吾頭川武央奥山浩二郎日比野纯一杉本和彦
Owner PANASONIC CORP
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