JPH09161724A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the reduction of light flux and increase the saturation of all colors by forming a phosphor layer added with two kinds of phosphors to three kinds of high-efficiency narrow-band luminescence phosphors having the luminescence peak within the specific wavelength range. SOLUTION: The phosphor layer formed on the inner peripheral face of a glass tube contains high-efficiency narrow-band luminescence phosphors having the luminescence peak at the wavelength of 445-455nm, high-efficiency narrow- band luminescence phosphors having the luminescence peak at the wavelength of 540-550nm, and high-efficiency narrow-band phosphors having the luminescence peak at the wavelength of 605-715nm. In addition to three kinds of phosphors, it also contains phosphors having the luminescence peak at the wavelength of 500-534nm and phosphors having the luminescence peak at the wavelength of 615-670nm. The weight ratio of the phosphors having the luminescence peak at the wavelength of 500-530nm against the phosphors having the luminescence peak at the wavelength of 540-550nm is preferably set to 30-70%. This fluorescence lamp emits visible light having the wavelength in the range of 380-780nm when it is excited by ultraviolet rays.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly to a fluorescent lamp in which a reduction in luminous flux is suppressed to a minimum and an object is more clearly seen.

[0002]

2. Description of the Related Art In a fluorescent lamp for illumination, a phosphor layer is formed on the inner peripheral surface of a glass tube, and when this phosphor layer is irradiated with ultraviolet rays generated by an electric current, visible light is emitted. It is a thing.

As a general fluorescent lamp for illumination, for example, wavelength 450 nm (blue), wavelength 545 nm
(Green), a phosphor layer formed by combining three types of high-efficiency narrow-band phosphors having an emission peak at a wavelength of 611 nm (red), and as described in JP-A-4-324241. The above-mentioned three types of high-efficiency narrow-band light-emitting phosphors to which a blue-green phosphor having an emission peak at a wavelength of 470 nm to 495 nm is added are widely used. As the blue-green phosphor, a divalent europium-activated strontium aluminate phosphor, a divalent europium-activated strontium borate phosphor, and a divalent europium-activated calcium / barium / magnesium halophosphate phosphor are known. , These are used alone or in combination of two or more. By adding such a blue-green phosphor, the average color rendering index (hereinafter referred to as “Ra”) can be improved to about 90. FIG. 18 shows an example of the spectral distribution of the fluorescent lamp to which the blue-green fluorescent material is added. As shown in the figure, in the spectral distribution of this fluorescent lamp, clear peaks can be confirmed in the vicinity of wavelength 545 nm (green) and in the vicinity of wavelength 611 nm (red), and in the vicinity of wavelength 450 nm (blue) and wavelength 4.
It can be seen that two peaks overlap in the vicinity of 70 nm to 495 nm.

[0004]

However, in such a conventional fluorescent lamp, the rate of increase in saturation (G9) of the test color 9 showing the degree of blush of red is as small as -15% or less, and each color is small. The color gamut area ratio (hereinafter also appropriately referred to as “Ga”) indicating the degree of vividness is about 100%, and there is a problem in that the vividness is applied. As a method for solving this problem, it is possible to add a deep red phosphor having an emission peak at 615 nm or more. By doing so, the color gamut area ratio becomes large, and almost all colors can be made to look vivid. However, there is a problem that the luminous flux is significantly reduced.

The present invention has been made in view of the above circumstances, and provides a fluorescent lamp in which a reduction in luminous flux is suppressed to a minimum and all colors, particularly green and red colors are visible. To aim.

[0006]

In order to achieve the above object, a fluorescent lamp according to claim 1 of the present invention is a fluorescent lamp having a fluorescent material layer formed on the inner peripheral surface of a glass tube. The layer has a high-efficiency narrow-band emission phosphor having an emission peak at a wavelength of 445 nm to 455 nm, and a wavelength of 540 nm to
In addition to three types of high-efficiency narrow-band emission phosphors having a high-efficiency narrow-band emission phosphor having an emission peak at 550 nm and a high-efficiency narrow-band emission phosphor having an emission peak at a wavelength of 605 nm to 615 nm, light emission at a wavelength of 500 nm to 535 nm It is configured to contain a phosphor having a peak and a phosphor having an emission peak at a wavelength of 615 nm to 670 nm.

That is, conventionally, in order to increase the saturation of reddish colors, a fluorescent substance such as MFG having a deep red emission has been added. By adding a phosphor having an emission peak in the wavelength region,
The luminous flux is reduced. Therefore, claim 1 of the present invention
In the fluorescent lamp according to the first aspect of the present invention, a part of the deep red phosphor having poor emission efficiency is replaced with a phosphor having a green color emission (wavelength 500 nm to 535 nm) which has a complementary color relationship with red and has good emission efficiency. , While suppressing the reduction of the luminous flux and making all colors, especially the colors of green and red, look bright.

The high-efficiency narrow band emission phosphor is
A phosphor containing a rare earth element and having a relatively sharp emission spectrum and high emission efficiency.

Further, in the fluorescent lamp of the present invention, since the decrease in luminous flux is small and all the colors appear bright, a wavelength of 500 for a high-efficiency narrow-band emitting phosphor having an emission peak at a wavelength of 540 nm to 550 nm is obtained.
The weight ratio of the phosphor having an emission peak at nm to 535 nm is preferably 30% by weight to 70% by weight.

Further, because of the emission of Mn, phosphors having an emission peak at a wavelength of 500 nm to 535 nm are divalent europium and divalent manganese activated barium-magnesium aluminate phosphor, divalent europium and divalent. Manganese-activated barium-magnesium-strontium phosphor phosphor, divalent manganese-activated cerium magnesium aluminate phosphor, divalent manganese-activated cerium magnesium aluminate phosphor, divalent manganese-activated zinc silicate phosphor Body, and trivalent terbium and 2
It is preferably at least one phosphor selected from the group consisting of valent manganese-activated cerium-magnesium aluminate phosphors.

Further, in the fluorescent lamp according to claim 4 of the present invention, a phosphor layer is formed on the inner peripheral surface of the glass tube, and this phosphor layer is excited by ultraviolet rays and has a wavelength of 380 nm to 780 nm.
A fluorescent lamp having emission energy in the visible wavelength region of nm, having a color gamut area ratio of 110% to 125%,
In addition, the saturation increase rate of the test color 9 is -10% to 2%.

In the invention according to claim 4 of the present invention,
The color gamut area ratio (Ga) means the following area ratio. That is, in the U ^* V ^* chromaticity diagram, the test color 1 with the reference light
Plot points 8 to 8 and connect these points with a straight line in the order of the above numbers to form an octagon. Also, in the same manner, an octagon of the fluorescent lamp which is the DUT is created. The percentage (%) of the area of the octagon of the fluorescent lamp of the ratio test sample to the area of the octagon of the above-mentioned light is the color gamut area ratio. In addition,
In the above U ^* V ^* chromaticity diagram, test colors 1 to 15 for color rendering evaluation
A plot of the appearance of color when light is radiated on a U ^* V ^* chromaticness diagram. In this figure, the farther the point on the fluorescent lamp of the DUT from the origin is, the brighter the color appears. The reference light is black body radiation or CI having the same color temperature as the fluorescent lamp of the DUT.
E Synthetic daylight. The above U ^* V ^* represents the chromaticity defined by the International Commission on Illumination (CIE).

In the present invention, the saturation increase rate (G9) of the test color 9 means the distance from the origin to the distance from the origin to the point of the test color 9 by the reference light in the U ^* V ^* chromaticness diagram. Fluorescent lamp test color for DUT 9
The increase rate of the distance to the point.

[0014]

Next, the present invention will be specifically described.

The fluorescent lamp of the present invention is a fluorescent lamp in which a phosphor layer is formed on the inner wall surface of a glass tube, wherein the phosphor layer is added to the above three types of high-efficiency narrow-band emission phosphors,
It contains a phosphor having an emission peak at a wavelength of 500 nm to 535 nm and a phosphor having an emission peak at a wavelength of 615 nm to 670 nm.

Among the above three types of high-efficiency narrow-band light-emitting phosphors, examples of the high-efficiency narrow-band light-emitting phosphor having an emission peak at a wavelength of 445 nm to 455 nm include, for example, divalent europium-activated barium-magnesium aluminate phosphor. ,
An example is a divalent europium-activated strontium / chloro / apatite phosphor.

As the high-efficiency narrow-band emission phosphor having an emission peak at a wavelength of 540 nm to 550 nm, for example, trivalent cerium and trivalent terbium activated lanthanum phosphate phosphor, trivalent terbium activated cerium aluminate. Magnesium is an example.

Examples of the high-efficiency narrow-band emission phosphor having an emission peak in the wavelength range of 605 nm to 615 nm include trivalent eurobium-activated yttrium oxide phosphor.

Preferred specific examples of the high-efficiency narrow-band light-emitting phosphor having an emission peak at a wavelength of 500 nm to 535 nm used in addition to these three types of high-efficiency narrow-band light-emitting phosphor are as described above. . Further, as a high-efficiency narrow band emission phosphor having an emission peak at a wavelength of 615 nm to 670 nm, which is used together with this, for example, 4
Examples include a valent manganese-activated fluoromagnesium germanate phosphor and a divalent europium-activated yttrium vanadate phosphor. Among these, a tetravalent manganese activated fluoromagnesium fluoromagnesium phosphor is preferable because it is less deteriorated.

The ratio of these five types of phosphors is
It is appropriately determined depending on the type of phosphor used and the like, but is generally as follows. That is, in terms of weight ratio, a high-efficiency narrow-band emission phosphor (a) having an emission peak at a wavelength of 445 nm to 455 nm and a wavelength of 540 nm to 55.
High efficiency narrow band emission phosphor (b) having an emission peak at 0 nm, high efficiency narrow band emission phosphor (c) having an emission peak at a wavelength of 605 nm to 615 nm, wavelength 500 nm to
In the phosphor (d) having an emission peak at 535 nm and the phosphor (e) having an emission peak at a wavelength of 615 nm to 670 nm, a: b: c: d: e = 3 to 30:10.
-60: 20-60: 2-40: 0.5-30.
And, preferably, a: b: c: d: e = 10 to 20:
It is 15 to 25:30 to 45:20 to 30: 0.5 to 10.

The fluorescent lamp of the present invention can be manufactured by a conventionally known method using the above-mentioned phosphor, depending on the type and form of the fluorescent lamp. An example of this is shown below.

That is, first, the above five kinds of phosphors are blended and mixed in the above-mentioned predetermined ratio to prepare a phosphor mixture.
When preparing this mixture, an additive such as butyl acetate may be added. On the other hand, prepare a glass tube. Examples of the form of the glass tube include a straight tube shape and an annular shape. Also. The size of the glass tube is appropriately determined according to the type of fluorescent lamp of interest. Then, a mixture of the above phosphors on the inner peripheral surface of this glass tube, for example,
The phosphor layer is formed by coating, drying and baking. Then, a fluorescent lamp is manufactured by forming electrodes, enclosing a glass tube, and the like by a conventionally known method. For example,
Flare glass with an exhaust glass tube and an electrode coated with an emitter material is welded to both ends of the glass tube. Then, the internal air is evacuated from the thin tube, and a rare gas such as Ar is enclosed in the tube for several Torr to seal the thin tube. Finally, attach the base to both ends. In this way, the fluorescent lamp of the present invention is manufactured.

Then, as described above, the fluorescent lamp of the present invention is excited by ultraviolet rays to generate a wavelength of 380 nm to 780 nm.
It emits visible light in the range of m, and Ga is 11
0% to 125% and G9 of -10% to 2%. That is, when Ga is less than 110%,
The color looks dull or faithful to nature, and no vividness is felt. Also, G9 is -10%
Below, the reddish color will appear dull. Also,
When Ga exceeds 125% or G9 exceeds 2%, the vividness becomes too strong and the color is far from the natural color, which makes it unsuitable for lighting. In addition,
The preferable range of Ga is 110% to 120%, and the preferable range of G9 is -10% to -5%.

In the fluorescent lamp of the present invention, the light source color is not particularly limited. For example, neutral white,
The range of light bulb color, white color, daylight color, etc. defined by JIS Z 9112 “Classification by fluorescent lamp light source color and color rendering” may be used.

[0025]

Next, examples will be described together with comparative examples. The types of phosphors used in the examples are shown in Table 1 below. In addition, the spectral distribution maps of these phosphors are shown in FIG.
Each is shown in FIG.

[0026]

[Table 1]

[0027]

Example 1 A fluorescent lamp was manufactured according to the above-described manufacturing method. That is, as the blue, blue-green (or green), green, red, and deep-red phosphors, BAT, CMZ, and
LAP, YOX, and MFG phosphors are used, the mixing ratio of these is changed, and the phosphor layer is formed by applying on the inner peripheral surface of a straight glass tube having a tube diameter of 28 mm, and a color temperature of 5
Various prototypes of fluorescent lamps of a light source color having a deviation from the black body locus of 000K were 0.

In these fluorescent lamps, CMZ and L
FIG. 12 shows changes in Ga and G9 on the U ^* V ^* chromaticness diagram of each fluorescent lamp when the mixing ratio of AP and the mixing ratio of MFG and YOX were changed. This U ^* V ^* chromaticness diagram is based on JIS Z
8724 “light source color measuring method” is used for measurement, and calculation and creation are performed according to the CIE recommendation of 1964.

In FIG. 12, Ga is 110% to 1
The shaded area indicates the region where G9 satisfies -10% to 2% at 25%. In this area, it was confirmed that all the colors looked vivid, especially the colors of green and red. However, when Ga is less than 110%, the color looks dull or naturally faithful, and no vividness is felt. When G9 was less than -10%, the reddish color appeared dull. On the other hand, in the range where Ga exceeds 125% or G9 exceeds 2%, the brightness is too strong and the color is far from the natural color, which is not suitable for lighting.

Next, in these fluorescent lamps, C
FIG. 13 shows changes in the luminous flux when the mixing ratio of MZ and LAP and the mixing ratio of MFG and YOX are changed. FIG. 14 shows a combination of FIG. 12 and FIG.

It can be seen from FIG. 14 that the luminous flux is reduced by adding MFG or CMZ in order to make the color appearance of the conventional fluorescent lamp look vivid. For example, Ga = 100
If we try to realize by adding MFG without using CMZ, YOX: MFG = 30: 70, and the luminous flux is about 25.
%descend. On the other hand, like the fluorescent lamp of the present invention, the MF
If it is realized by adding CMZ without using G, LAP: CM
Z = 60: 40, and the decrease in luminous flux is suppressed to about 7%. In this way, the MFG within the hatched area in FIG.
By substituting CMZ for a part of the above, the decrease in luminous flux is suppressed to a minimum, and the appearance of colors becomes sharp, and the utility value as a light source for illumination increases.

Further, in FIG. 1, the weight ratio is BAT: CM.
Z: LAP: YOX: MFG = 15: 26: 17: 3
The spectral distribution map of the 4: 8 fluorescent lamp is shown. As shown, this fluorescent lamp has a wavelength of 450 nm and a wavelength of 518 n.
m, wavelength 545 nm, wavelength 611 nm, wavelength 658 nm
It can be seen that each has an emission peak.

[0033]

[Example 2 and Comparative Example 1] CM as a green phosphor in a three-wavelength band emission type fluorescent lamp composed of BAT, LAP and YOX
Z was added at a weight ratio of LAP: CMZ = 40: 60. This is BAT: LAP: CMZ: YOX in weight ratio.
= 16: 18: 27: 39. A fluorescent lamp was produced in the same manner as in Example 1 except for this. On the other hand, as the fluorescent lamp of Comparative Example 1, a conventional fluorescent lamp was manufactured. The weight ratio of the phosphor in the fluorescent lamp of Comparative Example 1 was BAT: SAE: LAP: YOX = 16: 5: 4.
It is 8:31. The SAE is a divalent europium-activated strontium aluminate phosphor.

[0034] Each of the U ^* V ^* chromaticness view of the thus fluorescent lamp of Example 2 obtained in FIG. 15, the U ^* V ^* chromaticness view of a conventional fluorescent lamp of Comparative Example 1 in FIG. 17 Show. 15 and 16 (U ^* V ^* chromaticness diagram of Example 3 described later) and FIG.
In, the point for test color 9 is the value of U ^* V ^* is 1 /
The plots of the fluorescent lamps of Examples and Comparative Examples are shown by x, and the plots of the reference light source are shown by ◯. Further, the octagons of the color gamut areas of Examples and Comparative Examples are shown by broken lines, and the octagons of the color gamut area of reference light are shown by solid lines.

From the U ^* V ^* chromaticness diagrams of FIGS. 15 and 17, in the conventional fluorescent lamp of Comparative Example 1, the test color 5 and the test colors 1, 8 and 9 are low in saturation, so that blue and red system Was not vivid in the color. In contrast, Example 2
In the fluorescent lamp of, all colors increase in saturation,
It can be seen that the saturation of green and red colors increases and looks vivid. From this, it can be said that the saturation of the complementary color red increases even though the green phosphor is added. Further, the decrease in luminous flux was suppressed to 10%.

[0036]

Example 3 The ratio of the phosphor is LAP: CMZ = 40:
60, YOX: MFG = 80: 20. This is a weight ratio of BAT: LAP: CMZ: YOX: MFG = 1.
This corresponds to 5: 17: 26: 34: 8. A fluorescent lamp was produced in the same manner as in Example 1 except for this.

The U ^* V ^* chromaticness diagram of the fluorescent lamp of Example 3 thus obtained is shown in FIG. As shown, in the fluorescent lamp of Example 3, the saturation of all colors is increased. In particular, it can be seen that the colors of green and red are visible. In addition, the decrease in luminous flux was suppressed to 15%.

[0038]

Example 4 Instead of CMZ, BAT-Mn (Example 4
-1), CMM (Example 4-2), ZSM (Example 4-)
3) and CAM (Example 4-4) were used, and four types of fluorescent lamps were produced in the same manner as in Example 3 except for the above.

When the vividness of each of these four types of fluorescent lamps was examined in the same manner as in Example 1, it was confirmed that the saturation of all colors increased, and particularly the colors of green and red were visible. did it. When the decrease in luminous flux was examined in the same manner as in Example 1, the fluorescent lamp of Example 4-1 was 12%, the fluorescent lamp of Example 4-2 was 10%,
The fluorescent lamp of Example 4-3 was 14%, and the fluorescent lamp of Example 4-4 was 13%, and the decrease in luminous flux was suppressed.

[0040]

As described above, the fluorescent lamp of the present invention is
A fluorescent lamp having a phosphor layer formed on the inner peripheral surface of a glass tube, wherein the phosphor layer has a wavelength of 445 nm to 455 nm.
High-efficiency narrow-band phosphor with an emission peak at wavelength 5
In addition to three types of high-efficiency narrow-band emission phosphors having a high-efficiency narrow-band emission phosphor having an emission peak at 40 nm to 550 nm and a high-efficiency narrow-band emission phosphor having an emission peak at a wavelength of 605 nm to 615 nm, a wavelength of 500 nm to 535 nm And a wavelength range of 615 nm to 67
By containing the phosphor having the emission peak at 0 nm, the decrease of the luminous flux is suppressed to the minimum and the saturation of all the colors is increased, and in particular, the colors of green and red are shown vividly. For this reason, when the fluorescent lamp of the present invention is used for lighting, it is possible to obtain an excellent effect that all the colors of the living environment are attached and the surroundings look beautiful.

[Brief description of the drawings]

FIG. 1 is a spectral distribution diagram of a fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a spectral distribution diagram of BAT.

FIG. 3 is a spectral distribution diagram of BAT-Mn.

FIG. 4 is a spectral distribution diagram of SBAT.

FIG. 5 is a spectral distribution diagram of CMZ.

FIG. 6 is a spectral distribution diagram of CMM.

FIG. 7 is a ZSM spectral distribution diagram.

FIG. 8 is a spectral distribution diagram of CAM.

FIG. 9 is a spectral distribution diagram of LAP.

FIG. 10 is a spectral distribution diagram of YOX.

FIG. 11 is a spectral distribution diagram of MFG.

FIG. 12 is a change characteristic diagram of a color gamut area ratio and a saturation increase rate of a test color 9 of a fluorescent lamp according to an example of the present invention.

FIG. 13 is a luminous flux change characteristic diagram of the fluorescent lamp of the embodiment.

FIG. 14 is a diagram showing a combination of a change characteristic diagram of the color gamut area ratio of the fluorescent lamp and the saturation increase rate of the test color 9 and a luminous flux change characteristic diagram of the fluorescent lamp of the above-mentioned embodiment.

FIG. 15 is a U ^* V ^* chromaticness diagram of a fluorescent lamp according to an embodiment of the present invention to which CMZ is added.

FIG. 16: LAP: CMZ = 40: 60, YOX: MF
U ^* V of one embodiment of the present invention when G = 80: 20
^{* It is a} chromaticness diagram.

FIG. 17 is a U ^* V ^* chromaticness diagram of a conventional fluorescent lamp.

FIG. 18 is a spectral distribution diagram of a conventional fluorescent lamp.

Claims (4)

[Claims] 1. A fluorescent lamp having a phosphor layer formed on an inner peripheral surface of a glass tube, wherein the phosphor layer has a wavelength of 445 nm.
High-efficiency narrow-band emission phosphor having an emission peak at ˜455 nm, high-efficiency narrow-band emission phosphor having an emission peak at a wavelength of 540 nm to 550 nm, wavelength 605 nm to 615 n
In addition to three types of high-efficiency narrow-band light-emitting phosphors having an emission peak at m, a wavelength of 500 nm-
Phosphor having an emission peak at 535 nm and wavelength 61
A fluorescent lamp containing a phosphor having an emission peak at 5 nm to 670 nm. 2. A wavelength 500 for a high efficiency narrow band emission phosphor having an emission peak at a wavelength of 540 nm to 550 nm.
The fluorescent lamp according to claim 1, wherein the weight ratio of the phosphor having an emission peak at nm to 535 nm is 30% by weight to 70% by weight. 3. A phosphor having an emission peak at 500 nm to 535 nm is a divalent europium and divalent manganese activated barium magnesium aluminate phosphor, a divalent europium and divalent manganese activated barium magnesium strontium aluminate. Phosphor, divalent manganese activated cerium / magnesium / zinc phosphor, divalent manganese activated cerium / magnesium aluminate phosphor, 2
The fluorescent lamp according to claim 1 or 2, which is at least one phosphor selected from the group consisting of a valent manganese activated zinc silicate phosphor and a trivalent terbium and a divalent manganese activated cerium-magnesium aluminate phosphor. . 4. A phosphor layer is formed on the inner peripheral surface of the glass tube, and the phosphor layer has a wavelength of 380 nm when excited by ultraviolet rays.
A fluorescent lamp having emission energy in the visible wavelength region of ˜780 nm and having a color gamut area ratio of 110% to 125%.
And the increase rate of the saturation of the test color 9 is -10% to 2%.