KR100743068B1 - Plasma display panel having near-infrared sensorizer in phosphor and phosphor composition for use - Google Patents

Abstract

A plasma display panel using a near infrared ray generated during plasma discharge as a light emitting source of a phosphor is disclosed. The plasma display panel of the present invention is formed between a front plate and a back plate, the front plate and the back plate, the partition wall for partitioning the discharge space therein into a plurality of subpixels, at least one of the front plate and the back plate. A red, green, and blue phosphor layer formed on a series of electrode groups for driving the subpixels, sequentially formed on the partitioned plurality of subpixels, and including Er ³⁺ as a sensorizer; It characterized in that it comprises a discharge gas containing Xe filled in the discharge space. According to the present invention, it is possible to provide a plasma display panel having high luminance efficiency and capable of suppressing near infrared emission.

Sensorizer, Er3 +, Near Infrared, Resonant Energy Transfer, Plasma Display Panel

Description

Plasma display panel having near-infrared sensorizer in phosphor and phosphor composition used therein {PLASMA DISPLAY PANEL WITH NEAR-INFRARED SENSITIZER FOR FLUORESCENT MATERIAL AND FLUORESCENT MATERIAL COMPOSITION USED THEREIN}

1 is a cross-sectional view schematically showing a discharge cell constituting a panel of a conventional three-electrode surface discharge PDP.

FIG. 2 is a diagram showing a spectrum of an infrared region among emission spectra of plasma in which Xe gas is a discharge source gas.

Figure 3a is a diagram showing the main energy level of Er ³⁺ used as the sensorizer of the phosphor in the present invention.

3B shows an excitation spectrum near 800 nm of the Y _0.8 Er _0.2 F ₃ phosphor.

4A and 4B are energy level diagrams for explaining the light emission mechanism by Er ³⁺ used in the phosphor of the present invention, respectively.

5 is a cross-sectional view schematically showing a discharge cell constituting a PDP panel according to a preferred embodiment of the present invention.

6 is a diagram illustrating a PDP cross-sectional structure according to another embodiment of the present invention.

<Brief description of the symbols in the drawings>

10, 110: front panel 12, 112: display electrode

16, 116: dielectric layers 18, 118: protective film

20, 120: back plate 22, 122: address electrode

24, 124: phosphor layer 26, 126: dielectric layer

30, 130: bulkhead

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel using a near infrared ray generated during plasma discharge as a light emitting source of a phosphor, and a phosphor composition used therefor.

1 is a cross-sectional view schematically showing a discharge cell constituting a panel of a conventional three-electrode surface discharge PDP. Referring to FIG. 1, the PDP includes a front plate 10 displaying information and a back plate 20 disposed in parallel to the front plate 10.

The front plate 10 includes a pair of display electrodes 12 (expressing only one electrode in cross section) arranged in parallel on the glass substrate 11, and the back plate 20 is formed on the glass substrate 21. Includes an address electrode 22 arranged in a direction perpendicular to the display electrode 12. A plurality of the display electrode pairs and the address electrodes are arranged in rows and columns on the front plate 10 and the back plate 20.

The display electrode is generally a conductive electrode made of a transparent electrode such as indium tin oxide (ITO), and a bus electrode formed of a conductive metal along the edge of the transparent conductive film to compensate for the high resistance of the transparent conductive film. It consists of. On the display electrode 12, a dielectric layer 16 of low melting point glass, usually about 30 mu m thick, is applied, and a protective film 18 such as magnesium oxide is deposited on the surface thereof.

The address electrode 22 is made of a conductive metal material, and a dielectric layer 26 having a thickness of 10 m is usually applied thereon.

Between the front plate and the back plate, a partition wall 30 having a height of about 150 μm is arranged in a direction parallel to the address electrode 22. Discharge spaces are defined and subdivided for each subpixel by these partition walls 30. The partition 30 is provided with phosphor layers 24 of red, green and blue for color display. The discharge space for the plasma discharge is filled in the discharge space between the front plate 10 and the back plate 20, and one pixel in the phosphor layer 24 is composed of three subpixels arranged side by side in the row direction. do. The structure within a subpixel is usually called a cell.

The discharge space in the subpixel is filled with a mixed gas containing Xe as a discharge source gas and He, Ne, Ar, and / or Kr as a buffer gas.

The mixed gas generates ultraviolet rays having a wavelength of 147 nm or 173 nm generated by surface discharge between the pair of display electrodes, and excites the red, green, and blue fluorescent layers 24 by the generated ultraviolet rays to express a desired color. do.

Therefore, in a conventional PDP, Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O as a green phosphor such as CaWO ₄ : Pb, Y ₂ SiO ₅ : Ce, BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor of the phosphor layer 24. ₁₉ : Mn, BaMgAl ₁₄ O ₂₃ : Mn, SrAl ₁₂ O ₁₉ : Mn, ZnAl ₁₂ O ₁₉ : Mn, CaAl ₁₂ O ₁₉ : Mn, YBO ₃ : Tb, LuBO ₃ : Tb, GdBO ₃ : Tb, ScBO ₃ : Tb, Sr ₄ Si ₃ O ₈ Cl ₄ : Eu, etc., red phosphor, Y ₂ O ₃ : Eu, Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : Mn, YBO ₃ : Eu, Y _0.65 Gd _0.35 BO ₃ : Gd, BO ₃ : Eu, ScBO ₃ : Eu, LuBO ₃ : Eu, and the like, which are excited by ultraviolet light and emit a predetermined color, have been used.

However, the Xe gas emits light in the near-infrared region such as 823 nm and 828 nm in addition to ultraviolet rays upon discharge. FIG. 2 is a diagram showing a spectrum of an infrared region among emission spectra of plasma in which Xe gas is a discharge source gas. As shown, the Xe gas exhibits a spectrum with very large emission peaks around 800 nm by transition from Xe ^** -> Xe ^* .

However, since the existing phosphors do not respond to light in the near infrared region, most of the generated near infrared rays are emitted outside the PDP. Moreover, in the related art, a separate filter is used in front of the PDP to block near infrared rays, which causes an increase in PDP manufacturing cost.

An object of the present invention is to produce a PDP that is excited by near-infrared radiation generated in a discharge gas containing Xe and can increase discharge efficiency.

In addition, an object of the present invention is to provide a PDP that does not need to include a separate filter to block near infrared rays generated from the discharge gas containing Xe.

The present invention also aims to provide a phosphor composition suitable for application to the above-described PDP.

In order to achieve the above technical problem, the present invention is formed between the front plate and the back plate, the front plate and the back plate, partition walls for partitioning the internal discharge space into a plurality of subpixels, at least among the front plate and the back plate A series of electrode groups formed on one substrate to sequentially drive the subpixels, and a plurality of subpixels sequentially formed in the partitioned subpixels to form pixels, each of which includes red, green, and blue phosphor layers including Er3 + as a sensorizer. And an Xe-containing discharge gas filled in the discharge space.

In the present invention, the discharge gas preferably includes Xe as a source gas and at least one buffer gas selected from the group consisting of He, Ne, Ar, and Kr.

In the present invention, the phosphor layer is preferably a halogen compound selected from the group consisting of chloride, fluoride and oxychloride as a host material.

In addition, the phosphor layer is an activator and the red phosphor is selected from the group consisting of Eu ³⁺ and Er ³⁺ . At least one ionic, green phosphor selected from the group consisting of Er ³⁺ It is preferable to use at least one ion selected from the group consisting of Tm ³⁺ , Ce ³⁺ and Eu ³⁺ as at least one ion and a blue phosphor.

In the present invention, the panel expresses an image through the front plate, wherein the phosphor layer is preferably applied to the front plate, and the phosphor of the phosphor layer may have a particle size of 100 nm or less. In addition, the phosphor is preferably applied by a sol-gel method.

In order to achieve the above another technical problem, the present invention is formed between the front plate and the back plate, the front plate and the back plate, partition walls for partitioning the discharge space therein into a plurality of sub-pixels, the front plate and the back plate A series of electrode groups formed on at least one substrate to drive the subpixels, an Xe-containing discharge gas charged in the discharge space, and formed on the front plate side in the partitioned plurality of subpixels, Provided is a plasma display panel comprising a near-infrared phosphor layer for blocking near-infrared rays of a predetermined wavelength generated.

In order to achieve the above another technical problem, the present invention uses Er ³⁺ as a ^sensorizer and at least one ion selected from the group consisting of Tm ³⁺ , Ce ³⁺ and Eu ³⁺ as an activator, and a halogen as a host material. Provided are a blue phosphor composition for a plasma display panel comprising a compound. Here, the halogen compound is preferably at least one selected from the halogen compounds consisting of BaCl ₂ , ZrF ₄ , AlF ₃ , BaY ₂ F ₈ , LiYF ₄ and LaF ₃ .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the following drawings refer to like or similar components.

Figure 3a is a diagram showing the main energy level of Er ³⁺ used as the sensorizer of the phosphor in the present invention. Referring to FIG. 3A, Er ³⁺ has energy levels of ⁴ I _13/2 , ⁴ I _11/2 , ⁴ I _9/2 , ⁴ F _9/2 , ⁴ S _3/2 , and the like.

Here, since the ⁴ I _9/2 level corresponds to photon energy of about 800 nm wavelength, Er ³⁺ ions may be excited by absorbing near infrared rays in the 800 nm band. 3B shows an excitation spectrum near 800 nm of the Y _0.8 Er _0.2 F ₃ phosphor. It can be seen from FIG. 3b that a very large absorption peak occurs in the region of about 800 nm, from which it can be seen that Er ³⁺ ions are excited by absorbing light in a specific wavelength range of near infrared.

4A and 4B are energy level diagrams for explaining a phosphor light emitting mechanism by Er ³⁺ used in the phosphor of the present invention, respectively.

Referring first to FIG. 4A, Er ³⁺ ions excited (energy level ⁴ I _9/2 ) by about 800 nm of light ((a) of FIG. 4A) are released by a resonant energy transfer mechanism. Excitation of ³⁺ Easter (FIG. 4A (b)). The excited Er ³⁺ activator emits about 550 nm of green light after falling to the ⁴ S _3/2 level or emits about 600-650 nm of red light after _falling to the ⁴ F _9/2 level.

At this time, when the Er ³⁺ doped host material is a halide such as YF ₃ , the green light emission mechanism is dominated, and when the host material is an oxyhalide such as YOCl, the red light emission mechanism is Will dominate.

Thus, halogen compounds doped with Er ³⁺ (halides, oxy halides) according to the mechanisms described above have a green and red light depending on the resonance energy transfer mechanism, with Er ³⁺ acting as a sensorizer for near-infrared light of about 800 nm. Emits.

Meanwhile, FIG. 4B is an energy level diagram for explaining a blue light emission mechanism by the Er ^{3+ sensorizer} .

Referring to FIG. 4B, Er ³⁺ ions excited by near infrared near 800 nm excite Tm ³⁺ ions by the resonance energy transfer mechanism described above (energy level ¹ G ₄ ). In this excitation process, a plurality of successive resonant energy transfer mechanisms may be applied. The excited Tm ³⁺ ions emit blue light of about 450-500 nm.

As described with reference to FIGS. 4A and 4B, the phosphor of the present invention includes Er ³⁺ ions as a ^sensorizer , thereby enabling red, green, and blue light emission.

5 is a cross-sectional view showing the structure of a PDP panel according to a preferred embodiment of the present invention.

Referring to FIG. 5, the plasma display panel of the present invention includes a front plate 110 and a back plate 120, and an inner space between the front plate and the back plate defined by the bonding of the front plate and the back plate. Is partitioned by the partition 130. A plurality of electrode groups are disposed on the front plate and the back plate, and the discharge space between the front plate and the back plate is divided into a plurality of subpixels by the plurality of electrode groups and the partition wall.

 The illustrated figure shows a subpixel of a three-electrode surface discharge structure PDP, in which a pair of display electrodes 112 are arranged on the front plate, and an address electrode 122 is arranged on the back plate. The discharge space S between the front plate and the back plate is filled with a mixed gas including Xe as the discharge source gas and at least one gas selected from the group consisting of He, Ne, Ar, and Kr as the buffer gas. .

The subpixels are provided with R, G, and B phosphors 124 such that three subpixels constitute one pixel. In the present invention, the R, G, B phosphor is preferably a halogen compound as a host material. The halogen compounds can be used a fluoride, such as oxychloride YOCl such as _{chloride, ZrF 4, AlF 3, BaY} 2 F 8, LiYF 4, LaF 3 , such as BaCl _2.

Resurrection zero, the R phosphor is Eu ^3+, Er ³⁺ ions, or a combination thereof, in the case of the G phosphor in the case of Er ^3+, B phosphor activated zero Tm ^3+, Ce ^3+, Eu ³⁺ ion or Combinations of these can be used.

As described above, in the present invention, the R, G, and B phosphors all contain Er ³⁺ ions as a ^sensorizer .

For example, (Y, Er) OCl may be used as the R phosphor, and (Y, Er) F ₃ , (Na, Y, Er) F ₄ and (Ba, Y, Er) F ₈ may be used as the G phosphor. One or more materials selected from the group consisting of can be used. As the blue phosphor, (Y, Er, Tm) F ₃ may be used.

As shown, the R, G, B phosphors are preferably provided on the front plate side of the panel. More specifically, the R, G, and B phosphors are coated on the MgO protective film 118 and the partition wall 130 of the front plate. Such an arrangement suppresses the emission of near infrared rays through the front plate by absorbing the near infrared rays emitted from the plasma by R, G, and B phosphors, thereby eliminating the need to install a filter for blocking the near infrared rays on the front panel. Have

Of course, the above description does not exclude the case where the R, G, and B phosphors are formed on the back plate. In addition, it will be appreciated by those skilled in the art that the R, G, and B phosphors may be a mixture of the above-described halogen compound and a conventional ultraviolet phosphor.

Meanwhile, in the present invention, as the particle diameter of the halogen compound formed on the front plate side increases, the amount of visible light transmitted may decrease. Therefore, the average particle diameter of the halogen compound phosphor is preferably maintained at 100 nm or less.

In the present invention, the phosphor may be provided by a conventional method such as paste printing, green sheet laminating, ink jet, or the like. More preferably, the phosphor is prepared by a sol-gel method using Y ₂ O ₃ , SiO ₂ , ZrO _2, or Gd ₂ O ₃ or a mixture thereof as a matrix and provided on the dielectric of the front plate.

The preferred embodiment of the present invention described with reference to FIG. 5 is merely an example of a plasma display panel having a three-electrode surface discharge structure, and the present invention is not limited thereto. It will be appreciated by those skilled in the art that the present invention may be applied to other types of plasma display panels having a disposition or discharge mechanism.

6 is a diagram illustrating a PDP cross-sectional structure according to another embodiment of the present invention.

Referring to FIG. 6, the remaining structure is the same as the PDP structure described with reference to FIG. 5 except that the phosphor is provided not only on the front plate but also on the back plate.

In the present embodiment, two kinds of phosphors are provided as the phosphors. First, the phosphor 124 provided on the front plate is composed of a halogen compound having Er ³⁺ ions as a sensorizer as described above. Next, the backplate and the phosphor extending from the backplate and covering the sidewall are constituted by a conventional ultraviolet phosphor 125.

The ultraviolet phosphor 125 is one or more selected from the group consisting of CaWO ₄ : Pb, Y ₂ SiO ₅ : Ce, and BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, and Zn ₂ SiO ₄ : Mn, BaAl as a green phosphor. ₁₂ O ₁₉ : Mn, BaMgAl ₁₄ O ₂₃ : Mn, SrAl ₁₂ O ₁₉ : Mn, ZnAl ₁₂ O ₁₉ : Mn, CaAl ₁₂ O ₁₉ : Mn, YBO ₃ : Tb, LuBO ₃ : Tb, GdBO ₃ : Tb, ScBO ₃ : Tb and Sr ₄ Si ₃ O ₈ Cl ₄ : at least one member selected from the group consisting of Eu, Y ₂ O ₃ : Eu, Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : Mn, YBO ₃ : Eu, Y _0.65 Gd _0.35 BO ₃ : Gd, BO ₃ : Eu, ScBO ₃ : Eu and LuBO ₃ : Eu One or more selected from the group consisting of have.

In the present embodiment, the near-infrared phosphor 124 disposed on the front plate is preferably smaller in thickness than the ultraviolet phosphor. This is to minimize visible light absorbed by the near infrared phosphor. However, as the thickness of the near-infrared phosphor decreases, the amount of emitted near-infrared light increases, so that the thickness of the near-infrared phosphor may be set in an appropriate range in consideration of this.

In the present embodiment, when the near-infrared phosphor of the present invention is implemented in a very thin thickness, there is almost no loss of visible light transmittance, but by utilizing the discarded near-infrared light, the luminance efficiency of the phosphor can be increased and the function as a near-infrared filter can be performed. do.

Preferred embodiments of the present invention described above are merely illustrative of the present invention, and the present invention may be variously modified and may take various forms from such examples. Therefore, the present invention should not be construed as limited to the specific forms mentioned in the detailed description, but as including all modifications, equivalents, and substitutes falling within the spirit and scope of the invention as defined by the appended claims. Should be.

According to the present invention, by utilizing the near infrared rays generated from the discharge gas containing Xe as a light emitting source, not only can the panel discharge efficiency be improved, but also the near infrared rays can be prevented from being emitted to the outside of the panel. In addition, since the panel of the present invention does not need to employ a separate filter for blocking near infrared rays, it is possible to reduce the accompanying manufacturing cost.

In addition, the phosphor composition of the present invention can absorb near-infrared rays near 800 nm generated in the Xe discharge gas, thereby expressing the required color. The phosphor composition of the present invention can be mixed with conventional ultraviolet phosphors to not only improve the luminance of the panel, but also effectively absorb the near infrared rays of the Xe discharge gas to perform a function as a near infrared filter.

Claims (10)

Front and back panels; A partition wall formed between the front plate and the rear plate and partitioning an internal discharge space into a plurality of subpixels; A series of electrode groups formed on at least one of the front plate and the back plate and including a display electrode pair and an address electrode for driving the subpixel; Red, green, and blue phosphor layers sequentially formed in the partitioned plurality of subpixels to form pixels, each of which includes Er as a sensorizer; And And a Xe-containing discharge gas filled in the discharge space. The method of claim 1, And the discharge gas includes Xe as a source gas and at least one buffer gas selected from the group consisting of He, Ne, Ar, and Kr. The method of claim 1, And the phosphor layer is a halogen compound selected from the group consisting of chloride, fluoride and oxychloride as a host material. The method of claim 3, The phosphor layer is an activator and the red phosphor is selected from the group consisting of Eu ³⁺ and Er ³⁺ . At least one ion, green phosphor, selected from the group consisting of Er ³⁺ A plasma display panel using at least one ion selected from the group consisting of Tm ³⁺ , Ce ³⁺ and Eu ³⁺ as at least one ion and a blue phosphor. The method of claim 1, The panel displays an image through the front plate, and the phosphor layer is applied to the front plate. The method of claim 1, The phosphor of the phosphor layer has a particle size of less than 100nm plasma display panel. The method of claim 1, The phosphor is applied by a sol-gel method plasma display panel. Front and back panels; A partition wall formed between the front plate and the rear plate and partitioning an internal discharge space into a plurality of subpixels; A series of electrode groups formed on at least one of the front plate and the back plate and including a display electrode pair and an address electrode for driving the subpixel; Xe-containing discharge gas filled in the discharge space; And And a near-infrared phosphor layer formed on the front plate side in the partitioned plurality of subpixels and absorbing light of a predetermined wavelength band generated from the discharge gas to block near-infrared rays. A blue phosphor composition for a plasma display panel comprising Er ³⁺ as a ^sensorizer and at least one ion selected from the group consisting of Tm ³⁺ , Ce ^3+, and Eu ³⁺ as an activator and a halogen compound as a host material. The method of claim 9, The halogen compound is a blue phosphor composition for a plasma display panel, characterized in that at least one selected from a halogen compound consisting of BaCl ₂ , ZrF ₄ , AlF ₃ , BaY ₂ F ₈ , LiYF ₄ and LaF ₃ .

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