JPS6033863B2 - Pigmented phosphor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crab photon whose surface is coated with pigment particles (hereinafter referred to as a pigmented crab photon), and more particularly to a red pigmented red-emitting crab photon for color television cathode ray tubes.

As is well known, when blue pigment particles and red pigment particles are attached to the particle surfaces of the blue-emitting crab phosphor and the red-emitting nectar, respectively, of a color television cathode ray tube, the filter effect of these pigment particles changes the emission spectrum. Some of the visible light is cut off, making the luminescent color clearer, and the reflected light is reduced due to the absorption effect of external light due to the pigment coloring of the crab light film, which dramatically improves the contrast of the image (
Japanese Patent Publication No. 50-56146).

The pigmented phosphor used in the above-mentioned color television cathode ray tube is required to have a low reflectance to external light and a sufficiently high luminance. That is, when the specific reflectance is constant, the luminance is required to be as high as possible. Conventionally, europium-activated yttrium oxysulfide (Y202
S:Eu) Crab photoreceptor is used.

As described below, the emitted light color and luminance of this Y202S:Eu crab light body change depending on the amount of Eu activation, but when used as a red light emitting crab light body for a color television cathode ray tube, the color of the resulting cathode ray tube is The CIE color system chromaticity point A (x=0...
634, y; 0.357), B (x=0,643, y=
0.343), C (x: 0.652, y=0.340)
, D (x=0.652, y=0.348) and a red region in the vicinity thereof, and thus have a luminescent chromaticity point in the red region. Eu storage capacity is 0.06 per mole of Y202SI
Y2 ranging from 7 gram atoms to 0.08 gram atoms
02S:Eu backlight has been put to practical use as a red light emitting crab light for color television cathode ray tubes. On the other hand, as described in JP-A-50-56146, cadmium sulfur selenide is known as one of the red pigment particles to be attached to the red light-emitting light body of a color television cathode ray tube.

However, as is well known, cadmium contained in cadmium selenide sulfide red pigment particles is a highly toxic metal to the human body, and has caused problems in various fields in recent years.
A saddle phosphor containing such harmful metals is not desirable in practical terms, and extreme care must be taken in handling it, especially during the process of manufacturing the phosphor or applying the phosphor to a cathode ray tube. . There is also serious concern about the damage caused by cadmium when television sets are damaged or when disposed of discarded sets. Furthermore, in terms of waste treatment, the allowable amount of cadmium is very strictly determined by law, so it is necessary to reduce the cadmium concentration in the waste liquid from crab photon manufacturing plants and cathode ray tube manufacturing plants to below the allowable amount. , large-scale waste treatment facilities are required. From the above points, it has been desired to develop a red-emitting crab light-emitting body with a red pigment that does not use cadmium selenide sulfide red pigment particles. In addition, as the brightness of cathode ray tubes for color television has become higher, when comparing crab phosphors with the same specific reflectance, it has been found that the red light-emitting crab phosphor with red pigment using cadmium selenium sulfide red pigment particles has a higher brightness. There has been a demand for a red light-emitting crab phosphor with a red pigment that has even higher luminance. The present applicant has developed a red luminescent crab light body with red pigment that satisfies the above-mentioned requirements, particularly in Japanese Patent Application No. 51-89369.
We proposed a red-emitting crab phosphor with red pigment using red lead as the red pigment particles. This red-pigmented red light-emitting crab phosphor using red lead as the red pigment particles does not contain cadmium, and when comparing crab phosphors with the same specific reflectance, it is found that cadmium sulfur selenide red pigment particles were used. It exhibits luminance equal to or higher than that of the secondary red pigmented red luminous whistle light body. The present invention is a red pigmented red light emitting phosphor using Y20:Eu strong light material as a red light emitting crab light material and red lead as red pigment particles, the reflectance to external light is low and the luminance is sufficient. It is an object of the present invention to provide a red pigmented red light-emitting crab light body for color television cathode ray tubes that has a high emission color and a good emission color and is highly practical.

Y202S: The luminescent color and luminance of the Eu crab light body are Eu
It changes as the amount of activation changes. Furthermore, according to experiments conducted by the present inventors, when lead red pigment particles are attached to a Y202S:Eu crab light body, the luminescence chromaticity point of the resulting pigmented light body is Y20B:Eu light emission from the Eu crab light body. It was found that the wavelength is longer than the chromaticity point. Based on the above two findings, the present inventors created Y202S to achieve the above objective:
Various studies were conducted regarding the amount of Eu activation of the Eu phosphor and the amount of lead attached to the Y202S:Eu phosphor.
As a result, the Eu activation amount was 0.0 per mole of Y202SI.
Y ranging from 4 gram atoms to 0.066 gram atoms
202S:Eu crab photon and Y202S:Eu honey photon 0
．． The inventors have discovered that the above object can be achieved when red lead is deposited in a range of 1% to 12% by weight, leading to the present invention. That is, the pigmented crab photon according to the present invention includes a Y202S:Eu crab photon whose Eu activation amount is in the range of 0.04 gram atom to 0.066 gram atom per mole of Y202SI, and this Y202S:Eu crab photon. It consists of red lead red pigment particles attached to the surface, and the amount of the red lead red pigment particles attached is 0.1% by weight to 1 by weight of the Y202S:Eu crab light body.
a in the range of % by weight. The present invention will be explained in detail below.

Y20: The luminescent color and luminance of the Eu light body change as the amount of Hu activation changes.

Figure 1 shows the emission spectrum of Y202S:Eu crab photogen, and A, B, C, D, and E each have Eu activation amount of Y.
0.08 gram atom for 202 SI mole, 0.07
Emission spectra of Y202S:Eu photoreceptors that are gram atom, 0.06 gram atom, 0.05 gram atom, and 0.04 gram atom, and in each emission spectrum, the emission intensity on the vertical axis is the emission peak intensity at 626 nm. 10
It is shown as a relative value set to 0. Table 1 below is a table obtained by reading out the main emission peak intensities from the emission spectrum shown in FIG. Table 1 As is clear from Table 1 above, the Y202S:Eu crab photon becomes 626% as the amount of Eu activation decreases.
586nm, 555nm compared to the emission peak intensity of 586nm, 555nm
The emission peak intensities at m, 539 nm and 513 nm (marked o in Figure 1) tend to increase.

That is, in the Y202S:Eu bamboo phosphor, the emission color gradually shifts to the shorter wavelength side as the amount of Eu activation decreases.
This becomes even clearer from FIG. Figure 2 is Y
202S: This is a graph showing the relationship between the amount of Eu activation in the Eu light body and the x value and y value of the emission chromaticity point according to the CIE color system, and as is clear from FIG. 2, Y202S:
In the Eu crab photon, when the amount of Eu activation decreases, the x value of the emission chromaticity point decreases and the y value increases. That is, as the amount of Eu absorption decreases, the emission chromaticity point moves to the shorter wavelength side. Next, to describe the relationship between the amount of Eu activation and luminance in the Y202S:Eu phosphor, the luminance increases as the amount of Eu activation decreases in the Y202S:Eu strong phosphor.

Figure 3 is a graph showing the relationship between the amount of Eu activation and luminescence brightness in the Y202S:Eu saddle photoreceptor, and the luminance of Tatefuji is that the amount of Eu activation is 0.07 gram atom per mole of Y202SI. Y202S: Increase the luminance of the Eu crab light body to 10
It is shown as a relative value set to 0. As is clear from FIG. 3, the luminance increases as the amount of Eu activation decreases. As mentioned earlier, if the amount of Eu activation decreases, the emission peak intensity will be 586 nm, compared to 626 nm.
This is because the emission peak intensities at 555 nm, 53 nodal meters, and 51 orbital meters increase, and the emission brightness continues to increase until the amount of Eu activation decreases significantly and the absolute intensity of each emission peak decreases significantly. As mentioned above, Y202S:E
In the u-light body, as the amount of Eu activation decreases, the emitted light color gradually shifts to the shorter wavelength side, and the emission brightness gradually increases, and conversely, as the amount of Eu activation increases, the emitted light color gradually shifts to the longer wavelength side. , and the emission brightness gradually decreases.

As mentioned above, in a color television cathode ray tube that uses a Y202S:Eu crab light body as a red light emitting crab light body, the Y202S:Eu crab light body is the eighth choice from the viewpoint of various characteristics of the resulting cathode ray tube. CIE color system chromaticity point A (
x=0.643, y=0.357). B(x=0.64
3, y=0.343), C(x=0.652, yFO.
340), it is required to have a luminescent chromaticity point in the red region surrounded by D (x=0.652, y=0.348) and a red region in the vicinity, and therefore the luminescent chromaticity point is in the red region. A Y202S:Eu halo having an Eu activation amount in the range of 0.067 gram atom to 0.08 gram atom per mole of Y202SI has been put into practical use. On the other hand, as the red pigment particles used in the pigmented fluorophore of the present invention, those commonly available on the market are used. For example, according to the Japanese Industrial Standard K5108-1965, red lead is classified as a special grade (trilead tetraoxide content 97.0
% or more), No. 1 (with trilead tetraoxide content of 96.0% or more), No. 2 (with trilead tetraoxide content of 93.0% or more), and No. 3 (with trilead tetraoxide content of 93.0% or more). Red lead is classified into four types (those containing 80% or more), but any trilead tetroxide content can be used in the pigmented phosphor of the present invention. The body color of the red lead pigment particles differs depending on the manufacturing method, particle size, trilead tetroxide content, etc., but the red lead pigment particles used in the pigmented cauldron of the present invention are as follows: 100% reflectance of magnesium oxide diffuser
Then, the reflectance of the red region, that is, 50m, 5
The reflectance at 50nm, 60m, 65m and 700nm is within the range shown in the table below, and the reflection in the wavelength range shorter than 50m is extremely low, with a reflectance of at most 10% or less. It is. FIG. 4 illustrates the reflection spectrum of the red lead pigment particles used in the pigmented crab phosphor of the present invention.

In FIG. 4, the reflectance on the vertical axis is shown as a relative value with the reflectance of the magnesium oxide diffuser plate as 100%. The present inventors have found that when red lead pigment particles having a reflection spectrum illustrated in FIG. It has been found that the emission color is on the longer wavelength side than that of the Y202S:Eu crab photogen. Figure 5 shows the adhesion amount of gold red pigment particles and pigmented crab light in pigmented crab light bodies in which lead red pigment particles are attached to several Y202S:Eu crab light bodies with varying amounts of Eu activation. This is a graph showing the relationship between the luminescence chromaticity point x value of the body, and curves a, b, c, d, e, and f have Eu activation amounts of 0.03 gram atom and 0.04 gram atom, respectively, with respect to Y202SI mole. gram atom, 0.05 gram atom,
0.06 gram atom, 0.066 gram atom and 0.06 gram atom.
This is the case of 0.7 gram atom. From Figure 5, regardless of the amount of Eu activation, the luminous chromaticity point x value of the pigmented crab light body is Y20.
2S: It can be seen that the x value is larger than the x value of the Eu crab photobody itself. That is, it can be seen that no matter what the amount of Eu activation is, the color of light emitted by the pigmented afterlight is on the longer wavelength side than the color of light emitted by the Y202S:Eu crab light itself. Furthermore, it can be seen from FIG. 5 that as the amount of red pigment particles attached increases, the color of the emitted light of the pigmented crab luminescent material shifts to the longer wavelength side. Furthermore, from the curve f in Figure 5, Y202S:E has a good luminescent color as a red-emitting crab light for color television cathode ray tubes.
When a suitable amount of red lead is attached to the u-light body to make a pigmented crab light body, the luminescent color of the pigmented crab light body thus obtained shifts to the longer wavelength side, and is similar to the red-emitting crab light of a color television cathode ray tube. From the curves b, c, d and e in Figure 5, the emission color is too short wavelength and is therefore unsuitable for use as a red light whistle for color television cathode ray tubes. When an appropriate amount of red lead is attached to a suitable Y202S:Eu light body to make a pigmented light body, the emission color of the pigmented light body shifts to the longer wavelength side, making it suitable for color television cathode ray tubes. It can be seen that the red light-emitting crab has an appropriate luminescent color. Figure 6 shows several types of Y202S with varying amounts of Eu activation: Red lead pigment particles adhering agent and pigmented crab light bodies in pigmented crab light bodies in which red lead pigment particles are attached to Eu crab light bodies. This is a graph showing the relationship between luminance and luminance, and curves a, b, c, d, e, and f are curves when the Eu activation amount is 0.03 gram atom and 0.0 gram atom, respectively, with respect to Y202SI mole.
These are the cases of 4 gram atom, 0.05 gram atom, 0.06 gram atom, 0.066 gram atom and 0.07 gram atom.

Note that the luminance on the vertical axis is expressed as a relative value with the luminance of the Y202S:Eu crab light body having an Eu activation amount of 0.07 gram atom per mole of Y202S as 100. As mentioned earlier, in Y202S:Eu crab photons, the luminance is higher when the amount of Eu activation is smaller, so in general, when comparing pigmented crab photons with the same amount of lead red pigment particles attached, Eu Crab photons with less activation have higher luminance. Therefore, the Y202S:Eu crab light body (
Rather than using curve f), the Y202S:Eu crab photon (curve a,
When using b, c, d, and e), a pigmented crab luminous material with higher luminance can be obtained. Figure 7 shows the adhesion amount of red lead pigment particles and the pigmented saddle light body in pigmented crab light bodies in which leaden red pigment particles are attached to several types of Y202S:Eu backlight bodies with different Eu activation levels. This is a graph showing the relationship between the specific reflectance of
5 gram atom, and 0.06 gram atom.

As is clear from Figure 7, as the amount of red pigment particles attached increases, the specific reflectance naturally decreases, but the relationship between the amount of red pigment particles attached and the specific reflectance shows that the amount of Eu activation The flea photores are also almost the same. As is clear from FIGS. 5, 6 and 7 described above, Y2 is a red-emitting nectar.
02S: Y202S is a red pigmented red light-emitting crab light body using Eu crab light body and using red lead as red pigment particles.
: The amount of Eu activation of the Eu crab affects the luminance and color of the emitted light, and the amount of red pigment particles attached affects the reflectance,
Affects both luminance brightness and color.

Therefore, Y202S:Eu is a strong luminescent material that is suitable for the reflectance, luminance, and color of a red pigmented red luminescent pot for color television cathode ray tubes, and has been put into practical use as a red luminescent crab luminous material for conventional color cathode ray tubes. Y202
S: This crab photon has a smaller amount of Eu activation than the Eu crab photon.

Y202S whose Eu activation amount is in the range of 0.04 gram atom to 0.066 gram atom per mole of Y202SI
A pigmented crab phosphor in which 0.1% to 12% by weight of leaden red pigment particles of the Y202S:Eu phosphor are attached to the surface of the Y202S:Eu phosphor. be. Within the above leaden red pigment particle adhesion amount range, E
When the u activation amount is less than 0.04 g atom, the luminance is good, but the emitted light color becomes short wavelength, which is not preferable, and when it is more than 0.066 g atom, the luminance becomes extremely low. Moreover, the emitted light color also has a long wavelength, which is not preferable. In addition, if the amount of red lead pigment particles attached is less than 0.1% by weight in the above Eu activation amount range, the luminance will be good but the reflectance will be unfavorable, and the emitted color will have a short wavelength, and the la weight% If the amount is more, the reflectance will be good, but the luminance will be unfavorable, and the emitted light will have a longer wavelength. The more preferable Eu activation amount range and red lead pigment particle adhesion amount are each from 0.044 gram atom to 0.0 gram atom.
6 gram atoms and 2% to 10% by weight. Furthermore, Y202S:Eu used in the pigmented crab photoreceptor of the present invention
The crab light material has an average particle diameter of 3 to 15 grains, similar to the Y20:Eu crab light material conventionally used as a red light emitting crab light material for color television cathode ray tubes. More preferably, the average particle diameter is 4 to 12 particles. On the other hand, the lead red pigment particles used in the pigmented crab phosphor of the present invention have an average particle diameter of 0.1 μm to 1.5 μm. More preferably, the average particle size is 0.2M to 1.0M. The amount of lead red pigment particles attached is Y202S:Eu.
Although it is influenced by the particle size of the crab phosphor and the particle size of the red lead pigment particles, if the average particle size of the Y202S:Eu crab phosphor and the red lead pigment particles used are properly considered, the above 0.1 weight can be achieved. % to 12% by weight, a pigmented crab phosphor with good properties can be obtained. Y20: As a method for producing the pigmented crab light body of the present invention by attaching lead red pigment particles to the surface of the Eu crab light body, for example, JP-A-50-5
A method for producing a pigmented crab phosphor as described in No. 6146 may be employed.

In Tokukan Sho 50-56146, pigment particles dispersed in a suitable water port resin liquid such as polyvinylpyrrolidone and crab phosphor dispersed in a gelatin solution were mixed and illuminated, and the resulting precipitate was removed. Pigmented crab phosphors are produced by drying. However, in producing a pigmented crab photon, it is important to uniformly and firmly adhere the pigment particles to the crab photon surface. As a method for more uniformly and more firmly adhering pigment particles to the surface of the photoluminescent material, there is a manufacturing method using an electrostatic coating method for which the applicant has applied for a patent (
(Japanese Patent Application No. 51-49436), suspension polymerization method (Tokugan Sho 51-49437), copolymerization method (Tokugan Sho 51-7764y), and adhesion of a mixture of gelatin and gum arabic. Manufacturing method for preparation as an agent (patent application 1973)
1-80296) etc. are recommended. The pigmented crab light material of the present invention is excellent in reflectance, luminance and color as a red light emitting crab light material for color television cathode ray tubes, and has great industrial utility value.

Next, the present invention will be explained by examples.

Example 1 0.6 parts by weight of gelatin was dissolved in 4000 ml of warm water.
A 3% gelatin aqueous solution was prepared.

To this 0.3% gelatin aqueous solution, 100 parts by weight of Y202S:Eu crab optical material with an Eu activation amount of 0.06 g atom/mol and an average particle size of 8 Buddhas was added, and the mixture was converted into primary particles using an attrition machine. It was thoroughly and uniformly dispersed. In this way, a crab photon dispersion was obtained. The luminous chromaticity point of the Y202S:Eu backlight is the chromaticity point E' (x=0.630) shown in FIG.
y=0.355), and the specific reflectance and luminance are as shown in Table 2 below. On the other hand, gum arabic 0.
4 parts by weight were dissolved in water to prepare a 0.3% aqueous gum arabic solution.

This 0.3% gum arabic aqueous solution has an average particle size of 0.8
6 parts by weight of Buddha's Red Red Pigment Particles (Naoshima Kasei Co., Ltd. Special Edition) were added and sufficiently uniformly dispersed using a foundation mill to form primary particles. In this way, a pigment particle dispersion was obtained. Next, the above-mentioned crab photon dispersion and pigment particle dispersion were mixed together, the pH value of the mixed solution was adjusted to 4, and after cooling to below 1000, 1 part by weight of formalin was gradually poured into the mixture. Added.

After standing, the supernatant liquid was removed by decantation, and the precipitate was washed with water and separated and concentrated using a continuous decanter to obtain a pigmented crab cake with a solid content of approximately 85%. By air drying this cake, a pigmented crab phosphor having a leaden red pigment particle adhesion amount of 6% by weight was obtained. The pigmented crab phosphor obtained as described above has excellent reflectance, luminance, and color as a red luminescent phosphor for a color television cathode ray tube. The luminous chromaticity point of this pigmented crab luminous material is the chromaticity point E (x=0.650, y=0.346) in Figure 8, and the reflectance and luminance are shown in Table 2 below. That's right. Example 2 Gelatin 0. Dissolve part of the turtle weight in warm water with a temperature of 0.
A 3% gelatin aqueous solution was prepared.

This 0.3% gelatin aqueous solution has an Eu activation amount of 0.056.
Y202S:E with gram atom/mol, average particle size 10 French
100 parts by weight of U-Kaniko substance was added, and sufficiently uniformly dispersed using a dropper to form primary particles. In this way, a crab photon dispersion was obtained. The luminous chromaticity point of the above Y2QS:Eu backlight is the chromaticity point F' (x=0.632
, y=0.354), and the specific reflectance and luminance are as shown in Table 2 below. On the other hand, gum arabic 0
．． 4 parts by weight were dissolved in water to prepare a 0.3% aqueous gum arabic solution.

This 0.3% gum arabic aqueous solution has an average particle size of 0.8
5 parts by weight of Buddha's red lead pigment particles (Naoshima Kasei Co., Ltd.'s Lead Sealing Sen special number) were added and sufficiently uniformly dispersed using a fly azusa machine until they became primary particles. In this way, a pigment particle dispersion was obtained.
Next, the above-mentioned crab photon dispersion and pigment particle dispersion were mixed together, the pH value of the mixture was adjusted to 4, and after cooling to below 1000, 1 part by weight of formalin was gradually added while worshiping. Added.

After standing, the supernatant liquid was removed by decantation, and the precipitate was washed with water and separated and concentrated using a continuous decanter to obtain a pigmented crab cake with a solid content of about 85%. By air-flow drying this cake, a pigmented honeydew material having a leaden red pigment particle adhesion amount of 5% by weight was obtained. The pigmented backlight obtained as described above has excellent reflectance, luminance, and color as a red light-emitting light for a color television cathode ray tube. The luminous chromaticity point of this pigmented shark luminous body is the chromaticity point F (x=0.652, y=0.344) in Figure 8, and the reflectance and luminance are shown in Table 2 below. That's right. Example 3 Gelatin 0. Dissolve part of the turtle weight in 40 qo of warm water.
A 3% gelatin aqueous solution was prepared.

To this 0.3% gelatin aqueous solution, 100 parts by weight of Y20:Eu crab with an Eu activation amount of 0.05 g atom/mol and an average particle size of 7 Buddhas was added, and the mixture was converted into primary particles using a Nada Azusa machine. It was thoroughly and uniformly dispersed. In this way, a crab photon dispersion was obtained. The emission chromaticity point of the above Y202S:Eu crab light body is the chromaticity point ○' (x: 0.628, y
= 0.356), and the specific reflectance and luminance are as shown in Table 2 below. On the other hand, gum arabic 0.4
Part by weight was dissolved in water to prepare a 0.3% aqueous gum arabic solution.

This 0.3% gum arabic aqueous solution has an average particle size of 0.8
8 parts by weight of lead red pigment particles (manufactured by Naoshima Kasei Co., Ltd., lead red pigment particles) were added thereto, and sufficiently uniformly dispersed using a flocculator until they became primary particles. In this way, a pigment particle dispersion was obtained. Next, the above-mentioned crab phosphor dispersion and pigment particle dispersion were mixed while praying, the pH value of the mixture was adjusted to 4, and after cooling to below 10 qo, 1 part by weight of formalin was gradually mixed while praying. Added.

After standing, the supernatant liquid was removed by decantation, and the precipitate was washed with water and separated and concentrated using a continuous decanter to obtain a pigmented crab cake with a solid content of about 85%. By air drying this cake, a pigmented crab phosphor having a lead 8q red pigment particle adhesion amount of 8% by weight was obtained. The pigmented crab luminous material obtained as described above has excellent reflectance, luminance, and luminous color as a red-emitting back luminous material for a color television cathode ray tube. The luminous chromaticity point of this pigmented crab luminous material is the chromaticity point G (x=0.648, y=0.348) in FIG.
Further, the reflectance and luminance are as shown in Table 2 below. Table 2 *The luminosity of the light emitted from Eu is 0.07 g atom/mole.
*The light source for specific reflectance measurement is a tank stainless lamp.

[Brief explanation of the drawing]

Figure 1 shows the emission spectrum of Y202S:Eu crab photogen, and A, B, C, D, and E each have Eu activation amount of Y.
0.08 gram atom for 202 SI mole, 0.07
gram atom, 0.06 gram atom, 0.05 gram atom and 0.04 gram atom. FIG. 2 is a graph showing the relationship between the amount of Eu activation in the Y202S:Eu strong light material and the x value and y value of the emission chromaticity point according to the CIE color system. FIG. 3 is a graph showing the relationship between the amount of Eu activation and luminance in the Y202S:Eu groove light body. FIG. 4 illustrates the reflection spectrum of red lead pigment particles. Figure 5 shows the relationship between the amount of yellow red pigment particles attached and the emission chromaticity point x value of the pigmented crab phosphor, in which red lead pigment particles are attached to the Y202S:Eu phosphor. This is a graph showing curves a, b, c, d
, e and f are 0.03 gram atom and 0.04 gram atom, respectively, with respect to the Eu activation amount key Y202SI mole,
0.05 gram atom, 0.06 gram atom, 0.066
This is the case for gram atom and 0.07 gram atom. FIG. 6 is a graph showing the relationship between the amount of adhering red lead pigment particles and the luminance of the pigmented crab light body in a pigmented crab light body in which lead red pigment particles are attached to a Y202S:Eu crab light body. , curves a, b, c, d, e and f are Eu
Activation amount is 0.03 gram atom, 0.04 gram atom, 0.05 gram atom, 0.06 per mole of Y202SI
gram atom, 0.066 gram atom and 0.07 gram atom. Figure 7 is a graph showing the relationship between the amount of red-lead pigment particles attached and the specific reflectance of the pigmented backlight in a pigmented saddle light body in which red-lead pigment particles are attached to a Y202S:Eu light body. Yes, curves a, b and c are each 0.04 for Eu activation amount key Y202SI mole.
gram atom, 0.05 gram atom and 0.06 gram atom. Figure 8 shows the desired emission chromaticity range of the Y202S:Eu light body used in color television cathode ray tubes, the emission chromaticity point of the Y202S:Eu light body, and the emission chromaticity of the pigmented crab light body of the present invention. Points are shown on CIE color system chromaticity coordinates. Figure 1-△Figure 1-B Figure 1-c Figure 1-D Figure 1 [E Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A europium-activated yttrium oxysulfide phosphor having a europium activation amount ranging from 0.04 to 0.066 gram atoms per mole of yttrium oxysulfide, and this europium-activated yttrium oxysulfide phosphor. It consists of red lead red pigment particles attached to the surface of the yttrium oxysulfide phosphor, and the amount of the red red pigment particles attached is in the range of 0.1% to 12% by weight of the europium-activated yttrium oxysulfide phosphor. A pigmented phosphor for color television cathode ray tubes, characterized in that: 2. The reflectance of the leaden red pigment particles is 10% or less at wavelengths of 500 nm or less, 500 nm, 550 nm, 600 nm, 650 nm, and 700 nm, when the reflectance of the magnesium oxide diffuser plate is 100%,
5% to 10%, 10% to 15%, 55% to 75%
, 70% to 90% and 75% to 95% of the pigmented phosphor for color television cathode ray tubes according to claim 1. 3. The europium activation amount is in the range of 0.044 gram atom to 0.06 gram atom, and the amount of the red lead red pigment particles attached is in the range of 2.0% by weight to 10% by weight. A pigmented phosphor for a color television cathode ray tube according to claim 1 or 2. 4. The average particle diameter of the europium-activated yttrium oxysulfide phosphor is 3μ to 15μ, and the average particle diameter of the leaden red pigment particles is 0.1μ to 1.5μ. A pigmented phosphor for color television cathode ray tubes according to item 1, 2 or 3. 5. The average particle diameter of the europium-activated yttrium oxysulfide phosphor is 4μ to 12μ, and the average particle diameter of the leaden red pigment particles is 0.2μ to 1.0μ. A pigmented phosphor for color television cathode ray tubes according to item 4.