KR100669684B1 - Green Emitting Phosphor for Plasma Display Panel - Google Patents

Abstract

The present invention discloses a green light emitting phosphor for PDP represented by Chemical Formula 1 below.

BaAl _X O _{1 + 1.5x} : Mn

Here, the molar ratio of Al / (Ba + Mn) is 12.0-13.0, and the molar ratio of Mn is 0.10 or more and less than 0.20. The green light emitting phosphor for PDP according to the present invention greatly improves the luminous luminance characteristic as compared to the conventional green light emitting phosphor for PDP.

Description

Green Emitting Phosphor for Plasma Display Panel

1 is a graph showing a change in relative luminance according to the molar ratio of Al / (Ba + Mn) and the molar ratio of Mn in the BaAl _X O _{1 + 1.5x} : Mn PDP green light emitting phosphor according to the present invention.

The present invention relates to a green light emitting phosphor that can be applied to a plasma display panel (hereinafter referred to as PDP), and more particularly, to a green light emitting phosphor for PDP with improved luminance.

Phosphor refers to a material having a property of emitting light due to energy stimulation other than temperature radiation, and most of the phosphors that are practically used today are artificially synthesized by industrial technology rather than minerals of natural acid.

Phosphors are generally used for light sources such as fluorescent lamps, fluorescent mercury lamps, radiation lamps and the like; Display elements such as cathode ray tubes, electroluminescent devices, plasma display panels, and the like; It is used in detection devices such as X-ray sensitizer and scintillater, and is expected to be used for various purposes in the future with the development of new multimedia devices.

Such phosphors should be selected to have the characteristics of excitation in the wavelength range of the light source to which the applied device is exposed, the current saturation characteristics, deterioration characteristics, luminous luminance, color purity, afterglow characteristics, driving voltage, high current suitable for each application equipment Resistance and other physical properties under density should preferably be provided.

However, in most cases, Zn ₂ SiO ₅ : Mn phosphor is used as a green light emitting phosphor for PDP. This is because, in the case of Zn ₂ SiO ₅ : Mn phosphor, color coordinates are easy to move and afterglow time is easily adjusted according to the amount of Mn. However, this phosphor has a problem that it is difficult to increase the driving voltage and improve the luminance of light.

Therefore, BaAl ₁₂ O ₁₉ : Mn phosphor has recently attracted attention as a green light emitting phosphor for PDP because of its advantages such as high brightness, short afterglow time, and low driving voltage.

In general, BaAl _x O _{1 + 1.5x} : Mn phosphors have a hexa-aluminate structure as a basic structure, and the most suitable compositional formula is Al = 12, which has the most typical hexa-aluminate structure. However, there is an attempt to improve the luminance of light emission by adding a specific additive in BaAl _x O _{1 + 1.5x} : Mn phosphor. However, in this case, for example, the lattice parameter is changed slightly, for example, Mg is substituted for the Ba seat, and the light emission luminance is slightly changed, but the crystal structure is basically maintained in the hexa-aluminate structure, so that the luminance is emitted. The improvement is insignificant.

Accordingly, an object of the present invention is to provide a BaAl _x O _{1 + 1.5x} : Mn green light emitting phosphor for PDPs with improved luminance.

In order to achieve the above technical problem, the present invention provides a green light emitting phosphor represented by Chemical Formula 1 below:

<Formula 1>

BaAl _X O _{1 + 1.5x} : Mn

Here, the molar ratio of Al / (Ba + Mn) is 12.0-13.0, and the relative amount of Mn which substitutes Ba is 0.10 or more and less than 0.20.

In the phosphor according to the present invention, the molar ratio of Al / (Ba + Mn) is particularly preferably 12.5.

In the phosphor according to the invention, it is particularly preferable that the relative amount of Mn replacing Ba is 0.15.

Hereinafter, a method of manufacturing a green light emitting phosphor for PDP according to the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

 Example 1

Dry mixing by weighing BaCO ₃ , Al ₂ O ₃ , MnCO ₃ as necessary to change the molar ratio of Al / (Ba + Mn) to 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, while keeping the molar ratio of Mn at 0.10. It was. Subsequently, in order to reduce the atmosphere, the mixture was calcined at 1,300 ° C. for about 2 hours while injecting a mixed gas of H ₂ 5% / N ₂ 95% to obtain BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor.

The relative luminance (curve a) of the phosphor thus obtained was measured and shown in FIG. In this case, the relative luminance is compared with the PSS2 green phosphor (ink silicate phosphor) manufactured by Kasei, Japan, which is a green standard sample.

 Example 2

Dry mixing by weighing BaCO ₃ , Al ₂ O ₃ , MnCO ₃ as necessary to change the molar ratio of Al / (Ba + Mn) to 10.5, 11.0, 11.5, 12.0, 12.5, and 13.0, while fixing the molar ratio of Mn to 0.15. It was. Subsequently, in order to reduce the atmosphere, the mixture was calcined at 1,300 ° C. for about 2 hours while injecting a mixed gas of H ₂ 5% / N ₂ 95% to obtain BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor.

The relative luminance (curve b) of the phosphor thus obtained was measured and shown in FIG. In this case, the relative luminance is compared with the PSS2 green phosphor (ink silicate phosphor) manufactured by Kasei, Japan, which is a green standard sample.

 Comparative Example 1

Dry mixing by weighing BaCO ₃ , Al ₂ O ₃ , MnCO ₃ as necessary to change the molar ratio of Al / (Ba + Mn) to 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, while keeping the molar ratio of Mn at 0.20 It was. Subsequently, in order to reduce the atmosphere, the mixture was calcined at 1,300 ° C. for about 2 hours while injecting a mixed gas of H ₂ 5% / N ₂ 95% to obtain BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor.

The relative luminance of the phosphor thus obtained was measured, but the emission luminance characteristics were poor when compared with the results of Examples 1 and 2, and thus not shown in FIG. 1.

 Comparative Example 2

Dry mixing by weighing BaCO ₃ , Al ₂ O ₃ , MnCO ₃ as necessary to change the molar ratio of Al / (Ba + Mn) to 10.5, 11.0, 11.5, 12.0, 12.5, and 13.0 while fixing the molar ratio of Mn to 0.25 It was. Subsequently, in order to reduce the atmosphere, the mixture was calcined at 1,300 ° C. for about 2 hours while injecting a mixed gas of H ₂ 5% / N ₂ 95% to obtain BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor.

The relative luminance of the phosphor thus obtained was measured, but the emission luminance characteristics were poor when compared with the results of Examples 1 and 2, and thus not shown in FIG. 1.

Referring to FIG. 1, in terms of the molar ratio of Al / (Ba + Mn), when the molar ratio is 12.0 to 13.0, more preferably 12.5, BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor has the highest relative luminance. It can be seen that. In terms of the molar ratio of Mn, when the molar ratio is 0.10 or more and less than 0.20, more preferably 0.15, the relative luminance of BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor is excellent.

In more detail, when the molar ratio of Al / (Ba + Mn) is 12.5 and the molar ratio of Mn is 0.15, the relative luminance of BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor according to the present invention is Kasei Co., Ltd. It was about 8% more than the PSS2 green phosphor (zinc silicate phosphor). Under the same conditions, the relative luminance of BaAl _X O _{1 + 1.5x} : Mn green light emitting phosphor according to the present invention was increased by about 15% compared to the barium aluminate green light emitting phosphor of Kasei, Japan (not shown).

As described above, the green light emitting phosphor for BaAl _X O _{1 + 1.5x} : Mn PDP according to the present invention has significantly improved relative luminance as compared to the conventional green light emitting phosphor for PDP.

Claims (3)

A green light emitting phosphor for a plasma display panel (PDP) represented by Formula 1 below: <Formula 1> BaAl _X O _{1 + 1.5x} : Mn Here, the molar ratio of Al / (Ba + Mn) is 12.0-13.0, and the relative amount of Mn which substitutes Ba is 0.10 or more and less than 0.20. The green light emitting phosphor of claim 1, wherein the molar ratio of Al / (Ba + Mn) is 12.5. The green light emitting phosphor according to claim 1, wherein the relative amount of Mn replacing Ba is 0.15.

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