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Phosphor thin film, its production method and EL panel

A technology of phosphors and thin films, which is applied in the direction of discharge tube phosphor screens, chemical instruments and methods, light sources, etc., can solve the problems of increased panel manufacturing costs, complicated manufacturing processes, and inability to be practically applied, and achieves the effect of reducing costs.

Inactive Publication Date: 2009-01-21
IFIRE IP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the film forming conditions are set so as to obtain high luminance with a phosphor film of a specific composition, high luminance cannot be achieved for phosphor films of other colors.
Therefore, in order to manufacture full-color EL panels, it is necessary to have a variety of film-forming devices, resulting in complicated manufacturing processes and increased panel manufacturing costs.
[0007] In addition, the EL spectra of the above-mentioned blue, green, and red EL phosphor films are all broad, and when used in a full-color EL panel, the RGB necessary for the panel has to be obtained from the EL phosphor film using filters. Extracted from the EL spectrum of
When using filters, not only the manufacturing process is complicated, but also the biggest problem is the decrease in luminance
If a filter is used to extract RGB, the luminance of the blue, green, and red EL phosphor films loses 10% to 50% or more, and the luminance of the panel decreases, so it cannot be practically applied.
[0008] In addition, in order to be practical as an EL panel, it is necessary to maintain the brightness for a long time, that is, the brightness life must be very long

Method used

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  • Phosphor thin film, its production method and EL panel
  • Phosphor thin film, its production method and EL panel
  • Phosphor thin film, its production method and EL panel

Examples

Experimental program
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Embodiment 1

[0111] An EL element using the phosphor thin film of the present invention was produced. The substrate and thick film insulating layer use the same material BaTiO 3 Class dielectric material (dielectric constant 5000), the lower electrode uses Pd electrode. First, a green sheet of the substrate is produced, and the lower electrode and the thick-film dielectric layer are screen-printed thereon, and then the whole is sintered. Next, the surface was ground to obtain a substrate having a 30 μm thick thick-film dielectric layer. Furthermore, a 400nm thick BaTiO was formed on it by sputtering 3 The film was annealed in air at 700°C to form a composite substrate.

[0112] Formed on the composite substrate made of Al 2 o 3 Film (50nm thick) / ZnS film (200nm thick) / phosphor thin film (300nm thick) / ZnS film (200nm thick) / Al 2 o 3 A laminated structure composed of films (50 nm thick). The purpose of each film provided on both sides of the phosphor film is to make the EL element em...

Embodiment 2

[0128] In Example 1, Tb was used instead of Eu to obtain a luminance of 53cd / m 2 green glow.

Embodiment 3

[0130] In Example 1, one or two or more of Mg, Ca, and Ba were used instead of Sr, or together with Sr, and almost the same results were obtained. In this case, a turquoise glow is obtained.

[0131] In addition, in the phosphor thin films formed respectively in Examples 2 to 3 above, y / x in the aforementioned composition formula is in the range of 2.2 to 3.0, z / (w+z) is in the range of 0.13 to 0.33, and (x +3y / 2) / (z+w) is in the range of 0.9 to 1.1.

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Abstract

The invention provides a phosphor thin film having a high luminance, a satisfactory color purity enough to eliminate a need for filters, and a long luminance life, and best suited for each element of RGB in full color EL panels. The phosphor thin film of the invention comprises a matrix material and a luminescent center. The matrix material is a sulfide containing at least an alkaline earth element, Ga and / or In, sulfur (S) and optionally, Al, or an oxysulfide further containing oxygen (O) in addition to the foregoing elements. Provided that A stands for the alkaline earth element and B stands for Ga, In and Al in the matrix material, the atomic ratio B / A is in the range: B / A = 2.1 to 3.5.

Description

technical field [0001] The present invention relates to a phosphor thin film used in a light-emitting layer of an inorganic EL element or the like, a method for producing the phosphor thin film, and an EL panel using the phosphor thin film. Background technique [0002] In recent years, research on thin-film EL elements has sprung up as small or large light-weight flat panel displays. Monochrome thin-film EL displays using phosphor films made of zinc sulfide added with manganese that emit yellow-orange light have been adopted figure 2 The double insulating structure of the insulating layers 2 and 4 of the thin film shown is put into practical use. exist figure 2 In this method, a lower electrode 5 having a predetermined pattern is formed on a substrate 1, and a first insulating layer 2 is formed on the substrate 1 on which the lower electrode 5 is formed. Then, the light emitting layer 3 and the second insulating layer 4 are sequentially formed on the first insulating lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/62H05B33/14C09K11/77H01J1/63
CPCH01J1/63C09K11/7718C09K11/7731C09K11/7734C09K11/62
Inventor 矢野义彦大池智之
Owner IFIRE IP CORP
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