JPH05190144A - Fluorescent lamp for aquarium - Google Patents

Abstract

PURPOSE:To color-development-lighten the water plant and aquarium fish in an aquarium beautifully by mixing the specific color emission fluorescent bodies into a specific three-color narrow band light emission fluorescent body and setting the chromaticity point in the chromaticity range within a specific five standard equal color difference. CONSTITUTION:An Eu excitation narrow band region blue color emission fluorescent body having a luminous peak in the vicinity of 450nm, Ce-Tb excitation narrow band region green color emission fluorescent body having a lumious peak in the vicinity of 540nm, Eu excitation narrow band region red color emission fluorescent body having a luminous peak in the vicinity of 610nm, Mn excitation narrow band region deep red color emission fluorescent body having a lunminous peak in the vicinity of 660nm are mixed in 5-20wt%, and a fluorescent body layer is formed. The chromaticity point of the luminous color is set in the chromaticity range within a five-standard equal color difference, having the center T of x=0.288 and y=0.232. Accordingly, water plants, aquarium fish, small stones, etc., in an aquarium can be taken photograph disitinctly and beautifully, keeping original colors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ornamental fluorescent lamp, and in particular, a phosphor having a narrow band emission spectrum with high luminous efficiency is combined with a phosphor having a color rendering effect to vividly render red and green. The present invention relates to an improvement of an ornamental fluorescent lamp applied to a fish tank, etc.

[0002]

2. Description of the Related Art An ornamental fluorescent lamp applied to a fish tank of this kind has a chromaticity coordinate range of, for example, 0.250 <x <.
0.320, 0.200 <y <0.270 is used to form a light-emitting layer to form a light-emitting layer, which has an emission spectrum in a blue region or a red region, and emphasizes coloring in the region, thereby improving plant or It is used as an ornamental light source for tropical fish.

For example, Japanese Unexamined Patent Application Publication No. Sho.
8-103769 is a tin-activated strontium pyrophosphate phosphor having a light emitting peak in the blue region, a europium-activated yttrium oxide phosphor having a light emitting peak in the red region, and a europium-activated yttrium oxysulfide fluorescent substance. , Europium-activated yttrium phosphovanadate phosphor, one or more phosphors selected, and manganese-activated magnesium fluorogermanate phosphor phosphor are mixed, and the chromaticity coordinates are within the above range for ornamental fluorescence. A lamp is disclosed.

By the way, in the above-mentioned ornamental fluorescent lamp, since the emission spectrum is close to the spectral distribution of the reference light source,
A method of mixing five or more kinds of blue and red phosphors to obtain a continuous spectrum has been adopted, but it is difficult to obtain a bright one because each phosphor used has a low luminous efficiency. For example, a straight tube type 40W fluorescent lamp. In the case of, compared with 76 Lm / W of the white fluorescent lamp used for general lighting, 24 Lm / W
Improvements to W and brightness were needed.

For this reason, a narrow band light emitting phosphor, which is expensive but has a high luminous efficiency, is used as a phosphor used recently, and the above brightness problem is dealt with, and three color narrow bands of blue, green and red are used. It has been proposed to use a luminescent phosphor to improve color rendering properties, lamp efficiency, output maintenance, and discoloration. Examples of the above-mentioned three-color narrow-band emission phosphors include, for example, a blue-emission phosphor, a divalent europium-activated barium magnesium aluminate, a green emission phosphor, a terbium-activated cerium magnesium aluminate, and a red emission phosphor.
Various substances such as trivalent europium-activated yttrium oxide are known. Using such a known phosphor of three-color narrow band emission, the chromaticity point of the luminescent color is a region indicated by an ellipse centered on the point B of the CIE chromaticity diagram of FIG. 1, that is, chromaticity coordinate x =
There has been proposed a fluorescent lamp for a fish-culture aquarium (Japanese Patent Laid-Open No. 2-163, 023) in which the chromaticity range is set within 10 standard color matching deviations centering around 0.300, y = 0.232.

[0006]

However, the above-mentioned fluorescent lamp for a fish tank using the three-color narrow-band light-emitting phosphor as described above usually uses the three-color narrow-band light-emitting phosphor as a phosphor. Compared with the ornamental fluorescent lamps using the above fluorescent materials, you can obtain brighter, higher color rendering, less luminous flux attenuation and discoloration, but for viewing fish, water plants, pebbles, etc. of all colors such as fish tanks. In particular, it is not possible to faithfully reproduce the red and green primary colors.For example, a red goldfish looks somewhat yellowish orange, or a pure green aquatic plant looks yellow green. there were.

Therefore, the present invention has been made in view of the above-mentioned drawbacks, and it is possible to beautifully reproduce a reddish or greenish color, which is particularly required for ornamental applications such as fish tanks, in a clear shade with its primary color. It is intended to provide an ornamental fluorescent lamp.

As a result of the efforts of the present inventors to display aquatic plants of various colors, ornamental fish, pebbles, etc. in a fish tank and to visually evaluate these exhibits with fluorescent lamps of various luminescent colors, The blue, green and red tri-color narrow band emission phosphors are mixed with narrow band deep red emission phosphors and blue green emission phosphors in a predetermined mixture, and the chromaticity coordinates in the CIE chromaticity diagram of the fluorescent lamp are the chromaticity points. X = 0.288, y = 0.232
It was confirmed that by setting the chromaticity range within 5 standard color deviations centered around, the red and green colors, which are especially required for ornamental applications such as for fish farming aquariums, are projected beautifully in clear shades as the primary colors. .. The chromaticity range is indicated by an ellipse centered on a point A in the CIE chromaticity diagram of FIG. 1, and the chromaticity range of the fish lamp aquarium fluorescent lamp indicated by an ellipse centered on a point B. Are located in well-defined and very limited areas. And the fluorescent lamp set in the above chromaticity range, the mixture of the narrow band deep red light-emitting phosphors, the red-colored exhibits are projected in a clear hue as the primary color, and the green-colored exhibits are also visible. Be improved. Furthermore, by mixing this with a blue-green light-emitting phosphor in a predetermined composition, the green-colored exhibits can be projected in a clear hue as the primary colors, and the appearance of yellow-greenish exhibits can be improved. .. However, it has been confirmed that if the chromaticity range is deviated, the brightness in the fish culture tank cannot be obtained, and the appearance of the exhibits becomes poor.

[0009]

Therefore, the present invention provides 45
Europium activated narrow band blue light emitting phosphor having an emission peak near 0 nm, cerium having luminescence peak near 0 nm, terbium activated narrow band green light emitting phosphor, 6
5 to 20 europium activated narrow band red light emitting phosphors having an emission peak near 10 nm and manganese activated narrow band deep red light emitting phosphors having an emission peak near 660 nm.
It has a phosphor layer mixed by wt% and the chromaticity point of the emission color is x =
Provided is an ornamental fluorescent lamp characterized by being set in a chromaticity range within 5 standard color matching deviations centered at 0.288, y = 0.232. Furthermore, 530 to 55 is added to the phosphor layer.
Units having emission peaks at 0 nm and 430 to 460 nm
Provided is an ornamental fluorescent lamp in which 2 to 20 wt% of a ropium-activated blue-green light emitting phosphor is mixed.

[0010]

According to the above-mentioned structure, since the narrow band emission phosphor is used as the phosphor to be used, like the above-mentioned fish tank aquarium fluorescent lamp, the brightness is high, the color rendering is high, and the light flux attenuation and discoloration are small. Is obtained. Further, the phosphor used above has a chromaticity coordinate in a CIE chromaticity diagram of a fluorescent lamp obtained by mixing a deep red light emitting phosphor and a blue green light emitting phosphor with a blue, green and red three-color narrow band emitting phosphor. , Chromaticity point x
= 0.288, y = 0.232, and by setting the chromaticity range within 5 standard color matching deviations, the red and green colors that are especially required for viewing in fish tanks are clear and remain the primary colors. It is possible to project beautifully with various colors.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a partially cutaway sectional view of a fluorescent lamp applied in the present invention, in which a glass bulb 1 has a phosphor layer 2 formed on the inner surface thereof, and the glass bulb 1 contains mercury and mercury. A rare gas is enclosed and the electrodes 3 are attached to both ends.
A straight tube fluorescent lamp having a conventional structure and sealed in is shown. Table 1 shows the composition, chromaticity coordinates, peak wavelength and emission color of the phosphor used for forming the phosphor layer 2.
These phosphors are mixed and adjusted in such a ratio that the manufactured fluorescent lamp shows predetermined chromaticity coordinates, and the phosphor layer 2 is formed by coating the inner surface of the glass bulb 1 by a known method. A fluorescent lamp is manufactured in.

(Example 1) Table 2 shows the phosphors shown in Table 1 above, in addition to the three-color narrow-band emission phosphors of a blue emission phosphor, a green emission phosphor, and a red emission phosphor, a deep red color. It is the compounding ratio adjusted by changing the light emitting phosphor in the range of 0 to 50 wt%. Each of the samples A to K is fitted in the chromaticity region indicated by an ellipse centered on the point A in the CIE chromaticity diagram of FIG. 1, and the chromaticity coordinate x = 0.288 ± 0.0.
The compounding ratio of each phosphor was set within the chromaticity range of 03, y = 0.232 ± 0.003, and it was manufactured with a 40 W straight tube fluorescent lamp. FIG. 3 and FIG. 4 show the emission energy distributions of the fluorescent lamps of the manufactured fluorescent lamps, that is, the sample A in which the deep red light-emitting phosphor is not mixed and the sample G in which the same phosphor is mixed, respectively. Corresponding to the three-color narrow band emission phosphors of blue, green and red, it has a strong emission energy near 450 nm, 540 nm and 610 nm, but the fluorescent lamp of sample G also has a deep red color. Strong luminescence energy is shown near 660 nm corresponding to the luminescent phosphor.

Each of the samples A to K produced in this manner was evaluated for the appearance of objects as follows. That is,
The produced samples are 77.4 mired, which is greatly different from the black body locus, and there is a difference between Ra and Ri (i = 9 to 15) described in JISZ8726 and the visual evaluation. did. Specifically, in order to evaluate the visual appearance of the object, a fluorescent lamp of each sample was mounted in a fish tank, and as shown in Table 3, water plants of various colors, ornamental fish and pebbles were placed in the tank. A person with a normal color vision visually judges the significance of the appearance and the brightness in the tank. This evaluation was carried out with 5 ranks, and was set to 5, 4, 3, 2, 1 from the top.

Table 4 shows the evaluation results, and at the same time, the lamp efficiency of each sample is shown. From the same table, sample A in which the deep red light-emitting phosphor is not mixed looks like yellow-green to green aquatic plants a to d and orange to red ornamental fish f to h and i as in the conventional fluorescent lamp for fish farming tanks. However, the samples C to K containing 5% by weight or more of the deep red light-emitting phosphor have excellent evaluations of 4 to 5. Especially red and orange viewing fish f ~
The appearance of h and i has been improved from 3 to 5,
It can be seen that the reddish colors look vivid in the primary colors. Moreover,
The appearance of green aquatic plants a to d is also evaluated from 3 to 4
It can be seen that the appearance improves. It is presumed that this is due to the reflectivity of the deep red-emitting phosphor of greenish aquatic plants for the 660 nm emission spectrum.
However, if the deep red light emitting phosphor is mixed in an amount of 20 wt% or more, the luminous efficiency is lowered and the brightness in the water tank is impaired. Therefore, the mixing amount of the deep red light emitting phosphor is preferably in the range of 5 to 20 wt%.

(Example 2) In the evaluation in which the above deep red light-emitting phosphors are mixed, the present inventors further improve the evaluation level 4 of the appearance of yellow-green to green aquatic plants a to d. 0-20w blue-green light emitting phosphor in addition to phosphor
Samples L to R mixed in the range of t% were blended according to Table 5, and their chromaticity coordinates were x = 0.288 ± 0.003 and y = 0.232 ±, respectively, in the same manner as the samples AK.
It was manufactured with a 40 W straight tube fluorescent lamp set in the chromaticity range of 0.003, and the appearance of the object was visually evaluated in the same manner as the evaluation of the samples A to K.

Table 6 shows the evaluation results. From the table, samples N to R in which 2 wt% or more of blue-green light emitting phosphor is mixed
The evaluation of the appearance of yellow-green to green aquatic plants a to d is further improved as compared to 5 and the evaluation 4 of the appearance of Example 1, and the appearance of the green and yellowish green exhibits is further improved. Is shown. Further, there is no decrease in the brightness or luminous efficiency in the tank.
Here, when the mixing amount of the blue-green light emitting phosphor was 20 wt% or more, the chromaticity range did not fall within the above range, and color matching could not be performed.

Further, based on the results of Examples 1 and 2 above, the present inventors have added to the three-color narrow band emission phosphors of the blue light emitting phosphor, the green light emitting phosphor and the red light emitting phosphor. 10% by weight of the deep red light emitting phosphor and 5% by weight of the blue green light emitting phosphor, and the chromaticity point is x = 0.28.
Fluorescent lamps set in arbitrary coordinates within 5 standard color matching deviations centered at 8, y = 0.232 were manufactured, and the same evaluation was performed. As a result, the chromaticity point is x = 0.288, y =
It was confirmed that those within 5 standard color deviations centered around 0.232 were in a range where no color difference was felt and the brightness and luminous efficiency were not impaired.

[0018]

As described above, according to the present invention, the blue, green, and red three-color narrow band emission phosphors are mixed with a predetermined amount of the deep red emission phosphor and the blue-green emission phosphor and mixed, Since the chromaticity points are set within 5 standard color deviations centered around x = 0.288 and y = 0.232, especially red, yellow-green, and green exhibits should be vividly rendered in their original colors. Thus, it is possible to provide an excellent ornamental fluorescent lamp for a fish tank, etc.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[Brief description of drawings]

FIG. 1 is a CIE chromaticity diagram of a fluorescent lamp.

FIG. 2 is a partially cutaway sectional view of a fluorescent lamp to which the present invention is applied.

FIG. 3 is a light emission energy distribution characteristic diagram of a fluorescent lamp.

FIG. 4 is a light emission energy distribution characteristic diagram of a fluorescent lamp.

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[Procedure amendment]

[Submission date] February 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Ornamental fluorescent lamp

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ornamental fluorescent lamp, and in particular, a phosphor having a narrow band emission spectrum with high luminous efficiency is combined with a phosphor having a color rendering effect to vividly render red and green. The present invention relates to an improvement of an ornamental fluorescent lamp applied to a fish tank, etc.

[0002]

2. Description of the Related Art An ornamental fluorescent lamp applied to a fish tank of this kind has a chromaticity coordinate range of, for example, 0.250 <x <.
0.320, 0.200 <y <0.270 is used to form a light-emitting layer to form a light-emitting layer, which has an emission spectrum in a blue region or a red region, and emphasizes coloring in the region, thereby improving plant or It is used as an ornamental light source for tropical fish.

For example, Japanese Unexamined Patent Application Publication No. Sho.
8-103769 is a tin-activated strontium pyrophosphate phosphor having a light emitting peak in the blue region, a europium-activated yttrium oxide phosphor having a light emitting peak in the red region, and a europium-activated yttrium oxysulfide fluorescent substance. , Europium-activated yttrium phosphovanadate phosphor, one or more phosphors selected, and manganese-activated magnesium fluorogermanate phosphor phosphor are mixed, and the chromaticity coordinates are within the above range for ornamental fluorescence. A lamp is disclosed.

By the way, in the above-mentioned ornamental fluorescent lamp, since the emission spectrum is close to the spectral distribution of the reference light source,
A method of mixing five or more kinds of blue and red phosphors to obtain a continuous spectrum has been adopted, but it is difficult to obtain a bright one because each phosphor used has a low luminous efficiency. For example, a straight tube type 40W fluorescent lamp. In the case of, compared with 76 Lm / W of the white fluorescent lamp used for general lighting, 24 Lm / W
Improvements to W and brightness were needed.

For this reason, a narrow band light emitting phosphor, which is expensive but has a high luminous efficiency, is used as a phosphor used recently, and the above brightness problem is dealt with, and three color narrow bands of blue, green and red are used. It has been proposed to use a luminescent phosphor to improve color rendering properties, lamp efficiency, output maintenance, and discoloration. Examples of the above-mentioned three-color narrow-band emission phosphors include, for example, a blue-emission phosphor, a divalent europium-activated barium magnesium aluminate, a green emission phosphor, a terbium-activated cerium magnesium aluminate, and a red emission phosphor.
Various substances such as trivalent europium-activated yttrium oxide are known. Using such a known phosphor of three-color narrow band emission, the chromaticity point of the emission color is an area indicated by an ellipse centered on the point S of the CIE chromaticity diagram of FIG. 1, that is, the chromaticity coordinate x =
There has been proposed a fluorescent lamp for a fish-culture aquarium (Japanese Patent Laid-Open No. 2-163, 023) in which the chromaticity range is set within 10 standard color matching deviations centering around 0.300, y = 0.232.

[0006]

However, the above-mentioned fluorescent lamp for a fish tank using the three-color narrow-band light-emitting phosphor as described above usually uses the three-color narrow-band light-emitting phosphor as a phosphor. Compared with the ornamental fluorescent lamps using the above fluorescent materials, you can obtain brighter, higher color rendering, less luminous flux attenuation and discoloration, but for viewing fish, water plants, pebbles, etc. of all colors such as fish tanks. In particular, it is not possible to faithfully reproduce the red and green primary colors.For example, a red goldfish looks somewhat yellowish orange, or a pure green aquatic plant looks yellow green. there were.

Therefore, the present invention has been made in view of the above-mentioned drawbacks, and it is possible to beautifully reproduce a reddish or greenish color, which is particularly required for ornamental applications such as fish tanks, in a clear shade with its primary color. It is intended to provide an ornamental fluorescent lamp.

As a result of the efforts of the present inventors to display aquatic plants of various colors, ornamental fish, pebbles, etc. in a fish tank and to visually evaluate these exhibits with fluorescent lamps of various luminescent colors, The blue, green and red tri-color narrow band emission phosphors are mixed with narrow band deep red emission phosphors and blue green emission phosphors in a predetermined mixture, and the chromaticity coordinates in the CIE chromaticity diagram of the fluorescent lamp are the chromaticity points. X = 0.288, y = 0.232
It was confirmed that by setting the chromaticity range within 5 standard color deviations centered around, the red and green colors, which are especially required for ornamental applications such as for fish farming aquariums, are projected beautifully in clear shades as the primary colors. .. The chromaticity range is indicated by an ellipse centered on a point T in the CIE chromaticity diagram of FIG. 1, and the chromaticity range of the fluorescent lamp for a fish-culture aquarium indicated by an ellipse centered on the point S. Are located in well-defined and very limited areas. And the fluorescent lamp set in the above chromaticity range, due to the mixture of the narrow band deep red light emitting phosphors, the red-colored exhibition is projected in a clear hue as the primary color, and the green-colored exhibition also has the appearance. Be improved. Furthermore, by mixing this with a blue-green light-emitting phosphor in a predetermined composition, the above-mentioned green-colored exhibit can be projected in a clear color as the primary color, and the appearance of the yellow-greenish exhibit can be improved. .. However, it has been confirmed that if the chromaticity range is deviated, the brightness in the fish culture tank cannot be obtained, or the appearance of the exhibits becomes poor.

[0009]

Therefore, the present invention provides 45
Europium activated narrow band blue light emitting phosphor having an emission peak near 0 nm, cerium having luminescence peak near 0 nm, terbium activated narrow band green light emitting phosphor, 6
5 to 20 europium activated narrow band red light emitting phosphors having an emission peak near 10 nm and manganese activated narrow band deep red light emitting phosphors having an emission peak near 660 nm.
It has a phosphor layer mixed by wt% and the chromaticity point of the emission color is x =
Provided is an ornamental fluorescent lamp characterized by being set in a chromaticity range within 5 standard color matching deviations centered at 0.288, y = 0.232. Furthermore, 530 to 55 is added to the phosphor layer.
Units having emission peaks at 0 nm and 430 to 460 nm
Provided is an ornamental fluorescent lamp in which 2 to 20 wt% of a ropium-activated blue-green light emitting phosphor is mixed.

[0010]

According to the above-mentioned structure, since the narrow band emission phosphor is used as the phosphor to be used, like the above-mentioned fish tank aquarium fluorescent lamp, the brightness is high, the color rendering is high, and the light flux attenuation and discoloration are small. Is obtained. Further, the phosphor used is a mixture of three-color narrow band light emitting phosphors of blue, green and red with a deep red light emitting phosphor or a blue green light emitting phosphor, and the chromaticity coordinates in the CIE chromaticity diagram of the fluorescent lamp are , Chromaticity point x =
By setting the chromaticity range within 5 standard color deviations centered around 0.288, y = 0.232, the red and green colors, which are especially required for viewing in fish tanks, etc., remain clear as primary colors. It is possible to project beautifully in shades.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a partially cutaway sectional view of a fluorescent lamp applied in the present invention, in which a glass bulb 1 has a phosphor layer 2 formed on the inner surface thereof, and the glass bulb 1 contains mercury and mercury. A rare gas is enclosed and the electrodes 3 are attached to both ends.
A straight tube fluorescent lamp having a conventional structure and sealed in is shown. Table 1 shows the composition, chromaticity coordinates, peak wavelength and emission color of the phosphor used for forming the phosphor layer 2.
These phosphors are mixed and adjusted in such a ratio that the manufactured fluorescent lamp shows predetermined chromaticity coordinates, and the phosphor layer 2 is formed by coating the inner surface of the glass bulb 1 by a known method. A fluorescent lamp is manufactured in.

(Example 1) Table 2 shows the phosphors shown in Table 1 above, in addition to the three-color narrow-band emission phosphors of a blue emission phosphor, a green emission phosphor, and a red emission phosphor, a deep red color. It is the compounding ratio adjusted by changing the light emitting phosphor in the range of 0 to 50 wt%. Each of the samples A to K is included in the chromaticity region shown by an ellipse centered on the point T of the CIE chromaticity diagram of FIG. 1, and the chromaticity coordinate x = 0.288 ±.
The mixing ratio of each phosphor was set within the chromaticity range of 0.003, y = 0.232 ± 0.003, and the phosphor was manufactured by a 40 W straight tube fluorescent lamp. FIG. 3 and FIG. 4 show the emission energy distributions of the fluorescent lamps of the manufactured fluorescent lamps, that is, the sample A in which the deep red light emitting phosphor is not mixed and the sample G in which the same phosphor is mixed in 14 wt%. Both of them correspond to blue, green and red tri-color narrow band emission phosphors, around 450 nm, around 540 nm and 610 nm.
Sample G which has strong emission energy in the vicinity
In addition to this, the fluorescent lamp of No. 1 shows a strong emission energy near 660 nm corresponding to the deep red light emitting phosphor.

In each of the samples A to K thus manufactured, the chromaticity coordinates x and y of the respective lamps were measured, and the appearance of the objects of the respective lamps was evaluated as follows. That is, each manufactured sample is 77.4 mired, which is largely different from the black body locus, and there is a difference in Ra and Ri (i = 9 to 15) described in JISZ8726 from the visual evaluation. Adopted an evaluation. Specifically, in order to evaluate the visual appearance of the object, a fluorescent lamp of each sample was mounted in a fish tank, and as shown in Table 3, water plants of various colors, ornamental fish and pebbles were placed in the tank. A person with a normal color vision visually judges the significance of the appearance and the brightness in the tank. This evaluation was carried out with 5 ranks, and was set to 5, 4, 3, 2, 1 from the top.

Table 4 shows the evaluation results, and at the same time, the lamp efficiency and chromaticity coordinates x and y of each sample are shown.
Further, FIG. 5 is a chromaticity coordinate diagram of each of the measured samples, and these are all within the chromaticity region shown by an ellipse centered on the point T of the CIE chromaticity diagram of FIG. Included, and chromaticity coordinates x = 0.288 ± 0.003, y =
It is located within the extremely small chromaticity region shown by 0.232 ± 0.003. From Table 4, Sample A, which does not contain the deep red light-emitting phosphor, has the appearance of yellow-green to green aquatic plants a to d and orange to red ornamental fish f to h and i, as in the conventional fluorescent lamp for fish farming tanks. However, the samples C to K containing 5% by weight or more of the deep red light-emitting phosphor have excellent evaluations of 4 to 5. In particular, the appearance of the reddish and orange appreciation fish f to h, i was evaluated from 3 to 5, and it can be seen that the reddish fish looks vivid in the primary colors. In addition, the appearance of the green-colored aquatic plants a to d is also improved from 3 to 4, which shows that the appearance is improved. It is presumed that this is due to the reflectivity of the deep red light emitting phosphor of greenish aquatic plants for the strong emission spectrum near 660 nm. However, if the deep red light emitting phosphor is mixed in an amount of 20 wt% or more, the luminous efficiency is lowered and the brightness in the water tank is impaired. Therefore, the mixing amount of the deep red light emitting phosphor is preferably in the range of 5 to 20 wt%.

(Example 2) In the evaluation in which the above deep red light-emitting phosphors are mixed, the present inventors further improve the evaluation level 4 of the appearance of yellow-green to green aquatic plants a to d. 0-20w blue-green light emitting phosphor in addition to phosphor
Samples L to R mixed in the range of t% were blended according to Table 5, and their chromaticity coordinates were x = 0.288 ± 0.003 and y = 0.232 ±, respectively, in the same manner as the samples AK.
A 40 W straight tube fluorescent lamp set within a chromaticity range of 0.003 was used to manufacture the sample, and the samples A to K were evaluated in the same manner as described above.
The chromaticity coordinates x and y of each sample were measured and evaluated by visual observation. FIG. 6 is a sample P in which 10 wt% of the blue-green light emitting phosphor is mixed in the above sample.
FIG. 4 shows the light emission energy distribution of the fluorescent lamp of FIG.
Strong emission energy is shown in the vicinity of 516 nm with respect to the fluorescent lamp of Sample G of. Further, FIG. 7 is a chromaticity coordinate diagram of each sample, and all of them are shown in an elliptic shape centered on a point T of the CIE chromaticity diagram of FIG. 1 as in the case of the sample of Example 1 above. It is included in the chromaticity region, and the chromaticity coordinate x = 0.288 ± 0.003, y = 0.23.
It is located within the extremely small chromaticity region shown by 2 ± 0.003.

Table 6 shows the evaluation results. From the table, samples N to R in which 2 wt% or more of blue-green light emitting phosphor is mixed
The evaluation of the appearance of yellow-green to green aquatic plants a to d is further improved as compared to 5 and the evaluation 4 of the appearance of Example 1, and the appearance of the green and yellowish green exhibits is further improved. Is shown. Further, there is no decrease in the brightness or luminous efficiency in the tank.
Here, when the mixing amount of the blue-green light emitting phosphor was 20 wt% or more, the chromaticity range did not fall within the above range, and color matching could not be performed.

Further, based on the results of Examples 1 and 2 above, the present inventors have added to the three-color narrow band emission phosphors of the blue light emitting phosphor, the green light emitting phosphor and the red light emitting phosphor. 10% by weight of the deep red light emitting phosphor and 5% by weight of the blue green light emitting phosphor, and the chromaticity point is x = 0.28.
Fluorescent lamps set in arbitrary coordinates within 5 standard color matching deviations centered at 8, y = 0.232 were manufactured, and the same evaluation was performed. As a result, the chromaticity point is x = 0.288, y =
It was confirmed that those within 5 standard color deviations centered around 0.232 were in a range where no color difference was felt and the brightness and luminous efficiency were not impaired.

[0018]

As described above, according to the present invention, the deep red light emitting phosphor and the blue green light emitting phosphor are mixed in a predetermined amount and mixed with the blue, green and red three-color narrow band light emitting phosphors, Since the chromaticity points are set within 5 standard color deviations centered around x = 0.288 and y = 0.232, especially red, yellow-green, and green exhibits should be vividly rendered in their original colors. Thus, it is possible to provide an excellent ornamental fluorescent lamp for a fish tank, etc.

[Brief description of drawings]

FIG. 1 is a CIE chromaticity diagram of a fluorescent lamp.

FIG. 2 is a partially cutaway sectional view of a fluorescent lamp to which the present invention is applied.

FIG. 3 is an emission energy-distribution characteristic diagram of the fluorescent lamp of sample A.

FIG. 4 is an emission energy-distribution characteristic diagram of a fluorescent lamp of Sample G.

FIG. 5 is a CIE chromaticity diagram of the fluorescent lamps of Samples A to K.

FIG. 6 is an emission energy-distribution characteristic diagram of the fluorescent lamp of sample P.

FIG. 7 is a CIE chromaticity diagram of fluorescent lamps of samples L to R.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

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Claims (2)

[Claims] 1. A europium activated narrow band blue light emitting phosphor having an emission peak near 450 nm, cerium having a light emission peak near 540 nm, a terbium activated narrow band green light emitting phosphor, and a light emission peak near 610 nm. 660 nm for a europium-activated narrow-band red-emitting phosphor having a light-emitting peak
It has a phosphor layer in which 5 to 20 wt% of a manganese-activated narrow band deep red light-emitting phosphor having a light emitting peak is mixed in the vicinity, and the chromaticity point of emission color is x = 0.288, y = 0.232. An ornamental fluorescent lamp characterized by being set within a chromaticity range within 5 standard color matching deviations centering around. 2. A phosphor layer having 530 to 550 nm and 430
The ornamental fluorescent lamp according to claim 1, wherein 2 to 20 wt% of a europium-activated blue-green light emitting phosphor having an emission peak at 460 nm is mixed.