KR20100011780A - A green fluorescent substance - Google Patents

Abstract

PURPOSE: A manganese-activated aluminate green fluorescent substance is provided to ensure excellent photoluminescence intensity due to β-alumina structure stable in a luminescence center, high luminous efficiency and wide NTSC range. CONSTITUTION: A manganese-activated aluminate green fluorescent substance is represented by chemical formula: (Ba_0.0796)(Mg_0.6924M_z)5.7(Al_2O_3):Eu_0.03Mn_0.296, wherein M_z is selected from Ag or Ga. A method for preparing the manganese-activated aluminate green fluorescent substance comprises a step of plasticizing a compound containing Ba, Mg, Mn, Al and Ag or Ga at 1100 - 1300 °C for 1 ~ 10 hours in a mixed gas atmosphere of nitrogen/hydrogen through a solid-state reaction.

Description

Manganese-activated aluminate green phosphor

The present invention relates to a manganese-activated aluminate green phosphor, and more particularly, as the light emitting center constituting the phosphor has a stable β-alumina structure, the light intensity (PhotoLuminescence Intensity) is considerably excellent, and high purity and high brightness characteristics are achieved. It relates to the visible green phosphor.

Currently, phosphors are used in various fields such as lighting devices such as fluorescent lamps, display devices such as PDPs, and X-ray imaging tubes. White phosphors are usually obtained by combining red, blue, and green three-color phosphors. Among them, the green phosphor is an important phosphor that determines the range of white luminance and high color reproduction. Therefore, it is required to generate fluorescence of high luminance color range and high color purity.

Such conventional green phosphors are well known (Y, Tb) BO ₃ , Zn ₂ SiO ₄ : MnLaPO _{4 and} are blue phosphors, but BaMgAl ₁₀ O ₁₇ : Eu ^{2 +} (parts of Mg are Ca, Cu, Zn, Phosphors represented by Pb, Cd, Mg, and Sn) are also known. In addition, Zn ₂ SiO ₄ : Mn-activated alkaline earth aluminate phosphors BaAl ₁₂ O ₁₉ : Mn and BaMgAl ₁₄ O ₂₃ : Mn as green phosphors excited with ultraviolet rays in addition to Mn, which can emit light with high efficiency. Known (separately from Nikkei Micro Device Journal, Flat Panel Display, 1994, published by Nikki BP). (Japanese Patent Laid-Open No. 2002-173677). [E.g. 'Phosphor Handbook', Phorphor Research Society, p. 330-335 issued by Ohm Company.

In addition, in _{JP-A-52-143987 Ba 0 .9} Mg 0 .16 Al 23 or _{Ba 0 .3 Mg 0 .6 Mn 0} .1: UV using a 8Al ₂ O ₃ - the excited light-emitting device is introduced In addition, A (Zn _{1 - x} Mn _x ) Al ₁₀ O ₁₇ (wherein A is Ca, Ba or Sr, x represents a number satisfying 0.02≤x≤0.14), A may be any one of Ca, Ba, or Sr, and a phosphor which may include two and all of these elements has also been introduced.

However, in the case of the green phosphor, (Ba, Mn) Al ₁₂ O ₁₉ had a problem of high color purity but low brightness, and (Y, Tb) BO ₃ had high brightness but low color purity, and Zn ₂ SiO ₄ : Mn has a good balance of color purity and luminance compared to the above-described green phosphor, but has a problem in that the overall efficiency is low.

On the other hand, recently, BAM (Barium-Magnesium-Aluminate) phosphors have been widely used due to their small particle size, uniform particle size distribution and high luminous efficiency. Such BAM phosphors are based on the optical absorption and emission spectrum of barium hexaaluminate. .

The barium hexaaluminate is a transition according to the energy level when five electrons of Mn ²⁺ are under the influence of tetrahedral crystal filed, and the emission center of green emission is a crystal in which a small amount of Mn is tetrahedral with four oxygens. In the crystalline filed, the ⁴ T ₁ → ⁶ A ₁ transition is a spin flip transition in which the spin changes, due to the forbidden transition according to the normal spin selection rule. Barium hexaaluminate takes the intermediate form of magneto plumvanite structure and β-alumina structure, or is close to β-alumina structure, and depending on the amount of barium, barium hexaaluminate is low in barium (Ba-poor, β-alumina ) And many cases (Ba-rich, β'-alumina), and the optical absorption and emission spectra according to the amount of activator Eu ²⁺ , Mn ²⁺ and the amount of barium added are tetra-hedral of 5 3d electrons of Mn ²⁺ . This is the transition of the energy level when under the influence of the crystal filed.

In particular, since green light emission is a forbidden transition, the afterglow time is considerably longer than 4f ⁶ 5d ¹ → 4f ⁷ of Eu ²⁺ , which is an allowed transition. For example, BaMgAl ₁₀ O ₁₇ : Eu ^2+, Mn ²⁺ structure Mn ²⁺ increases with increasing amount of green light, and blue light decreases with addition of Mn ²⁺ and added (BaMgAl ₁₀ O ₁₇ It plays a role similar to Mg ²⁺ of: Eu) Mn ²⁺ based phosphor.

That is, when Mg ²⁺ is doped into the barium aluminate phosphor, Mg ²⁺ is substituted at the Al ³⁺ site, Eu ²⁺ is substituted at the barium site, and the BAM-based phosphor reduces the green light emitting area as compared with the barium aluminate phosphor. Al ³⁺ coexists at the two sites of octahedral and tetrahedral, and Mn ²⁺ is known to emit green light when substituted at tetrahedral site.

Thus, the barium aluminate in all the Mn ²⁺ substituted carbonate by the interaction between the Eu ²⁺ and Mn ²⁺ Ba ²⁺ substitution in the position substituted in tetrahedral position of Al ³⁺ blue light emission is significantly reduced, very strong When emitting light green and adding Eu ²⁺ and Mn ²⁺ to barium aluminium at the same time, Mn ²⁺ is an activator and Eu ²⁺ acts as an activator, so it can be applied as a green phosphor. Is actively being done.

However, the BAM green phosphors developed to date do not show sufficient luminescence intensity. Especially, in order to improve the characteristics of high-efficiency, high color reproduction, characteristics such as luminescence efficiency of phosphors should be further improved. Is not happening yet.

Accordingly, the present invention is to solve the above problems, to provide a manganese-activated aluminate green phosphor that exhibits a very excellent characteristic of the light intensity (PhotoLuminescence Intensity) as the emission center constituting the phosphor has a stable β-alumina structure It aims to do it.

The present invention to achieve the above object,

Achieved by providing a manganese activated aluminate green phosphor characterized by the formula (Ba _0.0796 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 , wherein M _z is selected from Ag or Ga do.

In another aspect, the present invention provides a manganese-activated aluminate green phosphor, characterized in that the mole number is 0.05 ~ 0.1 mol when M _z of the above formula.

In another aspect, the present invention provides a manganese-activated aluminate green phosphor, characterized in that the mole number is 0.02 ~ 0.03 when M _z of the formula.

In addition, the present invention provides a compound containing Ba, Mg, Mn, Al and Ag or Ga at 1100 to 1300 ° C. for 1 to 10 hours based on a solid-state reaction method by coprecipitation. The mixture was calcined under a mixed gas atmosphere of hydrogen, represented by the formula (Ba _0.0796 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 (wherein M _z is a metal selected from Ag or Ga) to prepare a compound. It provides a method for producing a manganese activated aluminate green phosphor, characterized in that.

In addition, the present invention provides a method for producing a manganese-activated aluminate green phosphor, characterized in that M _z of the above formula is added so that the mole number is 0.05 to 0.1 mol when Ag, and the mole number is 0.02 to 0.03 when Ga. to provide.

In addition, the present invention provides a vacuum ultraviolet excitation light emitting device which has a fluorescent film inside the envelope and excites and emits the fluorescent film by vacuum ultraviolet rays generated by the discharge of the rare gas enclosed in the envelope. Another object of the present invention is to provide a vacuum ultraviolet excitation light emitting device, characterized in that the green phosphor of claim 3 is used.

As described above, the manganese-activated aluminate green phosphor of the present invention is represented by the formula (Ba _0.792 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 , and when M _z is Ag, _0.05˜0.1 In the range of moles, when M _z is Ga, the light emitting center has a stable β-alumina structure at 0.025 to 0.03 moles, thus exhibiting excellent PhotoLuminescence Intensity. On the contrary, in the range of 220 ~ 300nm and 500 ~ 5500nm, the luminous efficiency of blue is low and the green light of higher purity is achieved and applied to CCFL as RGB. The color temperature can be shown to be high, thereby bringing the effect that it is possible to manufacture a phosphor having high purity and high brightness, high luminous efficiency and a wide range of NTSC.

Hereinafter, the present invention will be described in more detail.

The manganese-activated aluminate green phosphor of the present invention is represented by the formula (Ba _0.792 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 , wherein M _z is selected from Ag or Ga, and the M 0.05 to 0.1 mol when _z is Ag, and 0.02 to 0.03 mol when M _z is Ga. In addition, a portion of Mg may be substituted with Ag or Ga within a range not impairing the effect of the green phosphor of the present invention.

This, while the Mn as a luminescence center through which the blue light emission intensity in a range of 410 ~ 46nm weak emitting gosaek _{(Ba 0.0796) (Mg 0.6924 Ag} 0.05 ~ 0.1) 5.7 (Al 2 O 3): Eu 0.03 Mn 0.296 and (Ba _0.0796 ) (Mg _0.6924 Ga _{0.025 ~ 0.03} ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 . The crystal structure of the green phosphor has a β-alumina structure with stable emission center. It was confirmed through the examples described later that the high luminance and high color purity than the conventional green phosphor.

In the case of the conventional BAM phosphor, the particle size is not uniform and large particles and small particles are mixed, whereas in the case of the green phosphor containing Ag or Ga according to the present invention, the structure is formed to be more stable β. It is seen as an effect due to the formation of the alumina structure.

The green phosphor of the present invention can be formed by a known method, and a compound containing Ba, Mg, Mn, Al, Ag or Ga is weighed to a desired molar ratio for 1 to 10 hours at 1100 to 1300 ° C. and nitrogen / hydrogen. The compound is calcined in a mixed gas atmosphere. Moreover, reaction promoter can also be used in the range which does not prevent the effect of this invention which consists of halides.

In addition, the wavelength of light irradiated to emit fluorescence from the above green phosphor is not particularly limited, but is preferably a wavelength of 254 nm ultraviolet region.

The green phosphor of the present invention as described above can be used for display devices such as gas discharge devices such as fluorescent lamps and fluorescent display tubes.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are only presented to aid the understanding of the present invention, and the present invention is not limited to the following examples.

_{First, (1-x Eu x Ba} ) O · (Mg 1-yz Mn y M z) O · 5.7 (Al 2 O 3) based material is suitably in the matrix of the green light-emitting fluorescent substance and Ag a M _z place in the fluorescent substance, Recognizing that better emission characteristics can be obtained while maintaining emission of a wider wavelength by substituting Ga, reducing emission efficiency in the blue region in the range of 412 nm to 490 nm, and having excellent optical characteristics (Ba _1-x Eu) Find the composition formula of O · (Mg _1-yz Mn _y M _z ) O · 5.7 (Al ₂ O ₃ ) phosphors and modify the ancestor ratio of the reduction of each element to reduce the Mg to optimize the phosphors. The barium aluminate structure was well maintained even with the increase of certain amount, and high color reproducibility was compared with the color coordinate part, luminance and emission intensity.

<Manufacture example 1>

(Ba _1-x Eu _x ) O. (Mg _1-yz Mn _y M _z ) O.5.7 (Al ₂ O ₃ ) -based phosphors were synthesized by solid-state reaction by coprecipitation method. The process time was set to 16 hours and synthesized while maintaining the atmosphere while measuring the oxygen concentration using a temperature rise time of 5 hours, reaction time of 4.5 hours, reaction temperature of 1275 ° C., cooling of 8 to 10 hours, and N ₂ / H ₂ mixed gas. .

Selection of the raw materials used in the synthesis process is a solid phase synthesis method to determine the possibility of synthesis of (Ba _1-x Eu _x ) O · (Mg _1-yz Mn _y M _z ) O · 5.7 (Al ₂ O ₃ ) -based phosphor In order to analyze the raw materials described in Table 1 below, a purity of 99.9% or more and a particle size of less than 50 μm were used.

In addition, in the case of the selected raw material, since the mixed state has a large influence on determining the phosphor structure, homogenization by a ball mill was performed to use a sample mixed in a homogeneous state.

Raw material Purity (%) Raw material Purity (%) Raw material Purity (%) BaCO ₃ 99.0 Ga ₂ O ₃ 99.9 AgCl 99.9 CaCO ₃ 99.0 Y ₂ O ₃ 99.9 BaF ₂ 99.0 MnCO ₃ 99.0 Eu ₂ O ₃ 99.9 AlF ₃ 99.9 La ₂ O ₃ 99.0 Al ₂ O ₃ 99.9 NH ₄ F 99.9 MgO 99.9 Gd ₂ O ₃ 99.9 NH ₄ Cl 99.9 Tb ₄ O ₇ 99.9 CeO ₂ 99.9 H ₃ BO ₃ 99.9

<Example 1>

In the process of synthesizing (Ba _1-x Eu _x ) O. (Mg _1-yz Mn _y M _z ) O.5.7 (Al ₂ O ₃ ) -based phosphors using the raw materials selected and mixed as in Preparation Example 1 above. The optimum mixing amount was calculated through efficiency analysis while adjusting the amount of each raw material.

Efficiency analysis by adjusting barium amount

As shown in Table 2, in the case of barium synthesized and confirmed between 0.65 ~ 0.85 mol, the luminous efficiency is also high between 0.792 ~ 0.793 mol, color coordinates CIE X: 0.1464 CIE X: 0.6727 was set to the optimum conditions .

Ba forfeiture CIE X CIE Y Lumi One 0.790 0.1482 0.6730 57.2 2 0.791 0.1464 0.6749 58.3 3 0.792 0.1461 0.6714 61.3 4 0.793 0.1464 0.6727 61.1 5 0.794 0.1458 0.6724 61.6 6 0.795 0.1467 0.6668 56.6

-Mg _X Efficiency analysis by volume control

As shown in Table 3 below, the result obtained by synthesizing with 0.5 to 1.5 moles of magnesium is expected to be luminous efficiency between 0.5 to 0.9 moles and carried out at 0.6 to 0.75 moles in the range of CIE X: 0.1463 CIE X: 0.6730 in color coordinates. As judged appropriate, the molar ratio range of 0.69 ~ 0.699 was set as the optimum condition.

Mg _X 0.5 ~ 1.5 molar ratio control Mg _X 0.6 ~ 0.75 molar ratio adjustment 0  Mg Mall  CIE X  CIE Y Lumi 0  Mg Mall  CIE X  CIE Y Lumi One  0.50 0.1672 0.6471 97.7 One  0.60 0.1605 0.6683 86.9 2  0.90 0.1441 0.6563 99.6 2  0.65 0.1507 0.6770 85.5 3  1.00 0.1482 0.6220 80 3  0.70 0.1463 0.6730 84.4 4  1.50 0.1481 0.5700 52.9 4  0.75 0.1443 0.6696 83.7

-Al _X Efficiency analysis by volume control

As shown in Table 4 below, the result obtained by synthesizing 9.0 to 12 moles of aluminum is 11 to 12 moles in detail, and the luminous efficiency is high between 11.4 to 11.5 moles as a result of color coordinate analysis. The range of CIE X: 0.6618 was set to the optimum condition.

Al 9 ~ 12 molar ratio adjustment Al 11 ~ 11.8 molar ratio adjustment Al Mall  CIE X  CIE Y Lumi Al Mall  CIE X  CIE Y Lumi 0 std 0.1693 0.6405 17.6 0 std 0.1693 0.6405 17.6 One 9 0.1619 0.644 16.9 One 11.0 0.1513 0.6611 49.2 2 10 0.1709 0.6394 16.6 2 11.2 0.1605 0.6393 42.9 3 11 0.1678 0.6335 18.4 3 11.4 0.1538 0.6621 55.0 4 12 0.1690 0.6405 17.6 4 11.6 0.1543 0.6618 52.9 5 11.8 0.1539 0.6596 52.5

-Mn _X Efficiency analysis by volume control

As shown in Table 5, in the case of manganese, the result obtained by synthesizing with 0.1 to 0.35 moles was expected to be luminous efficiency between 0.29 and 0.34 moles. The luminous efficiency was high between 0.296 and 0.297 moles, and the color coordinate CIE X: 0.1454 to 0.1475 CIE X: 0.6765 to 0.6810 was set as an optimum condition.

Mn Mall  CIE X CIE Y Lumi One 0.295 0.1523 0.6728 65.4 2 0.296 0.1454 0.6765 68.0 3 0.297 0.1475 0.6810 67.5 4 0.298 0.1473 0.6797 66.8 5 0.299 0.1508 0.6768 66.9

-Efficiency analysis by adjusting the amount of Eu _X-

As shown in the following Table 6, Euroform was carried out at 0.01 ~ 0.05 moles of the expected luminous efficiency based on the results obtained from the basic research, it was analyzed that the luminous efficiency was high at 0.02 ~ 0.03 moles, the luminous efficiency at 0.03 moles considering the color coordinates High, and the color coordinate range CIE X: 0.1505 CIE X: 0.6512 set the optimum condition.

 Eu Mall  CIE X  CIE Y   Lumi One  0.01 0.1555 0.6604 48.2 2  0.02 0.1515 0.6577 55.9 3  0.03 0.1505 0.6512 54.9 4  0.04 0.1499 0.6442 49 5  0.05 0.1533 0.6647 57

- AlF ₃ Efficiency analysis by volume control

As shown in Table 7 below, in the case of AlF ₃ , the luminous efficiency was analyzed at 0.098 to 0.1 mole, and the color coordinate CIE X: 0.1484 CIE X: 0.6740 was set to the optimum condition.

AlF ₃ Mall   CIE X   CIE Y  Lumi 0 Std 0.1463 0.6704 94.8 One 0.098 0.1484 0.6740 94.6 2 0.10 0.1496 0.6724 91.4 3 0.15 0.1493 0.6732 91.5 4 0.20 0.1493 0.6724 91.4

- Ag Efficiency analysis by volume control

As shown in the following Table 8, in the case of silver, 0.1 ~ 0.2 mol, 0.01 ~ 0.05 molar ratio synthesized analysis results, considering the luminous efficiency, color coordinates CIE X: 0.1464 CIE Y: 0.6871 to set the optimum range of 0.05 ~ 0.1 mol Was

 Ag Mall  CIE X CIE Y Lumi 0 Std 0.1463 0.6704 62.1 One 0.05 0.1464 0.6871 60.0 2 0.10 0.1490 0.6620 63.5 3 0.15 0.1455 0.6779 59.4 4 0.20 0.1458 0.6765 59

Efficiency analysis by Ga amount control

As shown in Table 9, in the case of gallium, the result obtained by synthesizing at a molar ratio of 0.01 to 0.05 mole was set to 0.02 to 0.03 mole as the optimal condition in consideration of luminous efficiency and color coordinate CIE X: 0.1494 to 0.1493 CIE Y: 0.6680 to 0.6774. .

Ga Mall  CIE X  CIE Y  Lumi  One 0.01 0.1536 0.6596 49.5  2 0.02 0.1494 0.6680 62.7  3 0.03 0.1493 0.6774 65.4  4 0.04 0.1501 0.6882 63.1  5 0.05 0.1490 0.6700 44.3

Deterioration

As shown in Table 10, when the luminous efficiency of the phosphor after heat treatment at 600 ℃ for 1 hour in an oxidizing atmosphere was analyzed to be excellent in the thermal screen.

CIE X CIE Y Lumi % One Green 0.1462 0.6769 66.5 100 0.1455 0.6764 60.4 91 2  Std 0.1417 0.6316 60.8 100 0.1408 0.6175 50.4 83

More than one general the respective optimum results mixing amount, to (Ba _1-x Eu _x) as shown in Table 10, the raw materials such as _{O · (Mg 1 -y- z Mn} y M z) O · 5.7 (Al 2 O 3) M _z : Ag, Ga Optimum conditions for the phosphors were calculated.

Raw material name Creation costs Optimum One 2 3 BaCO3 0.77 0.78 0.790 0.791 0.792 0.793 0.794 0.7926 0.7926 0.7926 MgO 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.6924 0.6924 0.6924 Al2O3 9.5 9.75 10 10.5 10.75 11.0 12 11.4 11.4 11.4 MnCO3 0.294 0.295 0.296 0.297 0.298 0.299 3.0 0.296 0.296 0.296 Eu2O3 0.01 0.02 0.03 0.04 0.05 0.07 0.10 0.03 0.03 0.05 AgCl 0.01 0.02 0.03 0.04 0.05 ~ 0.1 ~ 0.20 0.05 0.05 Ga2O3 0.01 0.02 0.025 0.03 0.04 0.05 0.10 0.03 NH4F 0.077 0.078 0.079 0.080 0.081 0.082 0.083 0.0988 0.0988 0.0988 AlF3 0.09 0.092 0.095 0.097 0.098 0.099 0.1 0.0818 0.0818 0.0818

By the results of Table _{11, (Ba 0 .0796) (} Mg 0 .6924 M z) 5.7 (Al 2 O 3): Eu 0 .03 Mn 0 BaMgAl 10 to determine the synthetic potential of _0.296 based phosphor O _{17 :} Eu ⁺² Mn ⁺² phosphor The emission intensity measured under the excitation wavelength of 254nm and M was replaced by Ag and Ga to have an aluminate structure, and the SEM-electron micrograph showed that a green native phosphor was formed. It was confirmed that the luminescence intensity (Photo Luminescence Intensity) was significantly superior in the molar ratio of Ag, and the luminescence intensity was improved and the aluminate structure was formed in the molar ratio range of 0.025 to 0.03. Ag 0.05 ~ 0.1, Ga 0.03mol showed about 10 ~ 16% improvement compared to the comparative example.

Experimental Example 1

UV (254 nm) using a green phosphor having a chemical formula of (Ba _0.0796 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 and BAM green phosphor currently commercialized as a comparative group. After molding using a lamp-specific analysis equipment was determined visually, as a result, as shown in the accompanying Figure 1, in the case of the green phosphor of the present invention (A) of the comparative group of commercialized BAM green phosphor (B, C) Compared with), it was possible to confirm the high color reproducibility with the naked eye.

Experimental Example 2

The _luminance of the green phosphor having a chemical formula of (Ba _0.0796 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 and BAN green phosphor, which is commercially available, was set as a comparative group. Color coordinates, luminous efficiency was measured, and as a result, as can be seen from the color coordinate graph and luminance measurement values of Table 12 and the accompanying FIG. 2, the green phosphor A of the present invention is a commercialized BAM green phosphor (B, Compared with C), relative luminance was improved by 110 ~ 118%.

In addition, as a result of confirming the excitation emission spectra of the attached FIGS. 3A and 3B, in the case of the green phosphor (A) of the present invention, luminescence lower than that of the comparative group of commercially available BAM green phosphors (B, C) at 420 to 480 nm, which is blue. On the contrary, it was confirmed that the green phosphor (A) of the present invention exhibited a higher luminous efficiency in the section of 220 to 300 nm and 500 to 5500 nm. It can be seen that the light is emitted and the color temperature is high when mixed with RGB and applied to CCFL.

0.05 mol as M _z is Ag M _z is 0.03 mol as Ga  CIE X  CIE Y  Lumi CIE X  CIE Y Lumi One A 0.1454 0.6785 67.4 0.1458 0.6796 64.4 2 B - - - 0.1392 0.6330 58.2 3 C 0.1409 0.6288 61.2 0.1392 0.6345 58.3

1 is a photograph showing a luminescence analysis of a green phosphor according to an embodiment of the present invention

2 is a graph showing color coordinates of a green phosphor according to an embodiment of the present invention

3 is a graph showing an excitation emission spectrum of a green phosphor according to an embodiment of the present invention

Claims (6)

Formula _{(Ba 0 .0796) (Mg 0} .6924 M z) 5.7 (Al 2 O 3): Eu 0 .03 Mn 0. A manganese-activated aluminate green phosphor, represented by ₂₉₆ , wherein M _z is selected from Ag or Ga. The manganese-activated aluminate green phosphor according to claim 1, wherein when M _z is Ag, the number of moles thereof is 0.05 to 0.1 mole. The manganese-activated aluminate green phosphor according to claim 1, wherein when M _z is Ga, the number of moles thereof is 0.02 to 0.03. Based on the solid-state reaction method by coprecipitation method, a mixed gas atmosphere of nitrogen / hydrogen containing Ba, Mg, Mn, Al and Ag or Ga at 1100 to 1300 ° C. for 1 to 10 hours. _Calcined under a formula (Ba _0.0796 ) (Mg _0.6924 M _z ) 5.7 (Al ₂ O ₃ ): Eu _0.03 Mn _0.296 (wherein M _z is a metal selected from Ag or Ga) to prepare a compound. Method for preparing activated aluminate green phosphor. The method of claim 4, wherein M _z of the chemical formula is added so that the mole number is 0.05 to 0.1 mole when Ag, and the mole number is 0.02 to 0.03 when Ga. In a vacuum ultraviolet-excited light emitting device having a fluorescent film inside the envelope and exciting the fluorescent film by vacuum ultraviolet rays generated by the discharge of the rare gas enclosed in the envelope, A vacuum ultraviolet excitation light emitting element, wherein the fluorescent film uses the green phosphor of claim 2 or 3.

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