JPH08202302A - Light accumulation type light emitting body and its production - Google Patents

Abstract

PURPOSE: To realize a light accumulation type light emitting body with which an improvement in function is possible, management is easy and afterglow time is long and which is easily visible, has excellent practicability, ornamentability. amusementability and safety and is capable of preventing an increase in the size of a device and an increase in its cost and a process for producing the same. CONSTITUTION: This light accumulation type light emitting body 10 has a base body 11 formed by molding, for example, a transparent acrylic resin to, for example, an octahedron shape in order to impart an ornamental function thereto and to allow the resin to develop a design effect. In addition, a hole part (recessed part) 12 of a square shape from one end face side near toward the other end face side is formed at its axis as a center. A light accumulation material 13 formed by adding a rare earth element to a metal oxide based sintered material is applied uniformly over the entire part of the inside wall surfaces of this hole part 12. A UV curing agent is incorporated into the light accumulation material 13 at the time of applying the light accumulation material 13 on the inside wall surfaces of the hole part 12. This UV curing agent is then cured by irradiation with the UV rays at the time of drying the light accumulation material 13 and simultaneously the light accumulation material 13 is cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminous phosphor which can be used in a dark place and is used as a decoration for a clock.

[0002]

2. Description of the Related Art Generally, a table clock or the like is provided with a decorative body in its main body in order to add a value as an ornamental product in addition to the original function of the timepiece. Among these, there are some in which the decorative function is enhanced by using the decorative body as a light-emitting body so that the decorative body functions as a decorative article even at night.

In order to make the decorative body function as a luminous body,
For example, a method of using a phosphorescent material containing zinc sulfide as a main component, or irradiating and reflecting light on the surface of a decorative body made of a molded product such as glass beads or acrylic resin has been adopted.

[0004]

However, the conventional phosphorescent material is mixed with a pigment of a dedicated color from a design point of view (the phosphorescent color of zinc sulfide is yellow green), but it is colored. This lowers the brightness and shortens the afterglow time.
When used in a dark place, the emission brightness cannot be maintained in about 20 to 30 minutes.

In order to prevent the afterglow time from being shortened, a radioactive substance such as promethium is combined to spontaneously emit light as employed in a dial or the like, thereby maintaining a brightness of 0.3 mcd or more which can be visually recognized by humans. It is possible. However, in this case, since the radioactive substance is added to maintain the brightness, the amount of radiation is limited to 100 microcurie or less by the regulation of the "Radioactive Disorder Prevention Law", and the volume is large and the amount of usage is large. It cannot be used for other purposes, and enormous management costs are required due to the regulations of the "Radioactive Disorder Prevention Law" mentioned above.

[0006] Therefore, the applicant of the present invention, as a phosphorescent light emitting device that is easy to manage, has a long afterglow time, and is easy to see, and can be used for a wide range of applications, a rare earth element is provided on a colored layer or a ground plate colored in a predetermined manner. And a transparent phosphorescent layer made of metal oxide ceramics such as alumina containing alkaline earth metal is arranged (Japanese Patent Application No. 5-338).
169).

This light-emitting device reacts with light of a predetermined wavelength, for example, a fluorescent lamp having a large amount of ultraviolet rays or sunlight to store energy and emit light for a predetermined time. The brightness is higher than that of the conventional phosphorescent light emitting body made of zinc sulfide, and the afterglow time is 5 to 8 times longer than that of the phosphorescent light emitting body made of zinc sulfide.
Time is maintained. Therefore, it can be sufficiently applied as a decorative body even at night. Further, there is an advantage that a phosphorescent material similar to that colored can be manufactured in a pseudo manner by changing the printing color or the coating color of the underlayer to a desired color.

However, in this light emitting device, since the transparent phosphorescent layer is arranged on the flat base plate, the incident path of light is limited, and the amount of excitation light from the outside is restricted, and its brightness and There is a limit to the duration of light emission.

Further, in the method of irradiating and reflecting light on the surface of a decorative body made of a molded product such as a glass ball or an acrylic resin, a light source and its power source are required. Due to restrictions, there are problems such as an increase in size of the device and an increase in cost.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the function, to manage easily, to have a long afterglow time, and to be easy to see, to be practical, decorative, and playable. It is an object of the present invention to provide a phosphorescent light-emitting body that is excellent in safety and safety, and that can prevent an increase in size and cost of the device, and a manufacturing method thereof.

[0011]

In order to achieve the above object, the luminous phosphor of the present invention has an optically transparent substrate having a recess, and a metal oxide is provided on the inner wall of the recess of the substrate. A phosphorescent material obtained by adding a rare earth element to a system sintered material is applied.

In the method for producing a luminous phosphor of the present invention, a recess is formed in an optically transparent substrate, and the recess is formed in the substrate.
After a liquid-state phosphorescent material obtained by adding a rare earth element to a metal oxide-based sintered material is poured and the poured phosphorescent material is discharged from the recess, the phosphorescent material attached to the inner wall of the recess is dried and cured. Further, the method for manufacturing a phosphorescent-type light-emitting body of the present invention is
An ultraviolet curing agent is mixed into the phosphorescent material and poured into the concave portion. When the phosphorescent material is dried, ultraviolet rays are irradiated to cure the ultraviolet curing agent and simultaneously cure the phosphorescent material.

[0013]

According to the luminous phosphor of the present invention, there is no restriction on the incident path of light having a predetermined wavelength, which is excitation light, and the excitation light is incident from the entire three-dimensional base body and applied to the inner wall of the recess. Reach the existing phosphorescent material. As a result, the phosphorescent material is in a highly excited state when the added rare earth element receives a large amount of light.
Therefore, the phosphorescent material emits light radially with high brightness. This light is emitted directly or diffusely reflected to the outside of the substrate. As a result, the entire light emitting body emits light with high brightness when viewed from any direction.

Further, according to the method for manufacturing a light-emitting body of the present invention, a liquid-state light storing material mixed with, for example, an ultraviolet curing agent is poured into the concave portion of the substrate. Then, after the poured phosphorescent material has spread evenly on the inner wall of the recess, the poured phosphorescent material is discharged from the recess. As a result, the phosphorescent material uniformly adheres to the inner wall of the recess. After discharging the phosphorescent material, at least the concave portion is irradiated with ultraviolet rays. Along with this, the phosphorescent material adhered to the inner wall of the recess is uniformly cured together with the curing action of the ultraviolet curing agent.

[0015]

1 and 2 are views showing an embodiment of a luminous phosphor according to the present invention, FIG. 1 is a front view thereof, and FIG. 2 is a longitudinal sectional view of FIG.

As shown in the figure, the present phosphorescent type light-emitting body 10 is
For example, a transparent acrylic resin has a base 11 molded in a polyhedral shape such as 6 or 8 in order to have a decorative function and to exert a design effect, and
A rectangular hole (recess) 12 is formed from one end face side to the vicinity of the other end face around the axis, and a rare earth element is added to the metal oxide-based sintered material over the entire inner wall surface of the hole portion 12. The added phosphorescent material 13 is applied uniformly (uniformly).

The phosphorescent material 13 is made of, for example, a sintered oxide of a metal and an alkaline earth metal element, to which a trace amount of a few ppm of a rare earth element is added. The sintered oxide functions as a light emitting body and the rare earth element functions as a catalyst for transition to an excited state. Here, aluminum (Al) is used as the metal of the sintered oxide, and strontium (Sr) is used as the alkaline earth metal. The chemical formula of the sintered oxide in this case is as follows. Sr _x · Al _y · O _Z

Such a phosphor is slightly yellowish green and has a higher transparency than conventional zinc sulfide, and as shown in FIG. 3, zinc sulfide (ZnS) which is a conventional general phosphorescent material.
Longer afterglow and higher brightness. In addition, the phosphorescent material stores energy in response to fluorescent light or sunlight, which has a large amount of ultraviolet rays. A good wavelength is about 370 nm.

FIG. 4 is a graph showing the results of measuring the afterglow time of the present luminescent material, the conventional phosphorescent luminescent material using zinc sulfide and the self-luminous luminescent material to which promethium is added. In FIG. 4, the horizontal axis represents the irradiation time and the afterglow time, and the vertical axis represents the afterglow brightness. Further, in the figure, the curve indicated by A-1 shows the characteristics of the luminescent material using the phosphorescent material according to the present invention arranged on the white background printing color, and the curve indicated by A-2 shows the yellow green color on the white background printing color. The characteristics of the luminous body using the phosphorescent material according to the present invention arranged by including the pigment of
The curve indicated by is the characteristic of the luminous body using the phosphorescent material according to the present invention arranged on the color printing color, the curve indicated by B is the conventional luminous element made of zinc sulfide, and the curve indicated by C is self-luminous. The characteristics of the type light emitter are shown respectively. As can be seen from FIG. 4, the present luminous body has higher brightness than the conventional luminous body,
The afterglow time is about 5 to 8 hours, which is ten times longer than that of the phosphorescent light emitting body using zinc sulfide. As described above, since the long-time afterglow characteristic is provided, the present luminous body can be sufficiently applied as a decorative body even at night when the illumination is turned off.

A method of manufacturing the light emitting body 10 using the phosphorescent material having such characteristics, particularly the coating step of the phosphorescent material 13, will be mainly described with reference to FIG. First, as shown in FIG. 5A, a liquid-state phosphorescent material 13 containing a binder mixed with, for example, an ultraviolet curing agent is provided in the hole 12 of the base 11.
Pour. Then, the phosphorescent material 13 poured into the hole 12
After evenly spreading over the inner wall of the plate, the poured phosphorescent material 13 is discharged from the hole 12 as shown in FIG. As a result, the phosphorescent material 13 uniformly adheres to the entire inner wall of the hole 12. After discharging the phosphorescent material 13, FIG.
As shown in (c), ultraviolet rays UV are applied to at least the holes 12
Irradiate against. Along with this, the ultraviolet curing agent is cured, and the phosphorescent material 13 attached to the inner wall of the hole 12 is uniformly cured together with the curing action. Thereby, the luminous body 1
0 is finished manufacturing.

Luminescent phosphor 10 having such a structure
In this case, a predetermined wavelength (37
The incident path of 0 nm) light is not restricted, and the excitation light is incident from substantially the entire surface of the three-dimensional substrate 11, and the transparent acrylic resin is in a straight-ahead state as it is, or is subjected to refraction or is irregularly reflected while the holes are formed. The light storage material 13 applied to the inner wall of 12 is reached. In this way, since the excitation light is incident from almost the entire surface of the three-dimensional substrate 11, the amount of excitation light is large. As a result, the phosphorescent material 13 receives a large amount of light of the added rare earth element and is in a high excited state, and the phosphorescent material 13 emits light radially with high brightness. This light is dispersed in the space inside the hole 13, and is directly or irregularly reflected and radiated to the outside of the base 11. As a result, the light emitting body 10 emits light with high brightness.

As described above, according to this embodiment,
For example, a base 11 made of a transparent acrylic resin is molded into, for example, an octahedron shape to have a decorative function and to exert a design effect, and the one end face side to the other end face around the axis thereof. Square hole (recess) 12 extending to the vicinity
Since the phosphorescent material 13 in which the rare earth element is added to the metal oxide-based sintered material is uniformly applied over the entire inner wall surface of the hole 12, it is more transparent than applying the phosphorescent material on the surface. There is a feeling and a high-class image can be revealed, the function can be improved,
In addition, it realizes a luminous phosphor that is easy to manage, has a long afterglow time, is easy to see, has excellent practicability, decorativeness, playability, and safety, and does not increase the size or cost of the device. it can. Also, because it is safe without using radioactive materials,
It can also be applied as a large light emitting device, the application such as decoration can be expanded, and the member management cost can be reduced.

When the phosphorescent material is applied to the inner wall of the hole (recess) 12, the phosphorescent material 13 containing the binder is mixed with the ultraviolet curable material, and in the drying step, the ultraviolet curable material is irradiated with ultraviolet rays to cure the ultraviolet curable material. Since the phosphorescent material 13 is also cured, the phosphorescent material 13 can be dried in a short time, and the phosphorescent material and the binder can be prevented from separating from each other. Therefore, the phosphorescent material 13 can be uniformly distributed over the entire inner wall of the hole 12. It can be applied.

The shape and material of the base 11 and the shape of the hole (recess) 12 are not limited to those in this embodiment, and various modes are possible. Further, in the present embodiment, the hole portion 12 has been described as an example having a bottom, but it is not limited to this, and it goes without saying that it may be a through hole.

[0025]

As described above, according to the present invention,
It is more transparent than applying a phosphorescent material on the surface and can present a high-class image, improving the function, easy to manage, long afterglow, easy to see, practical, decorative,
It is possible to realize a luminous phosphor that is excellent in playability and safety, and does not increase the size and cost of the device. Also,
Since no radioactive substance is used, it can be applied as a large light emitting device.

Further, according to the method of the present invention, it is possible to easily and uniformly apply the phosphorescent material to the inner wall of the recess.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a luminous phosphor according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a diagram for comparing the afterglow time of a phosphorescent light emitting device according to the present invention and a conventional phosphorescent light emitting body using zinc sulfide.

FIG. 4 is a graph showing the results of measuring the afterglow time of a luminescent material according to the present invention and a conventional phosphorescent luminescent material using zinc sulfide and a self-luminous luminescent material to which promethium is added.

FIG. 5 is a diagram for explaining a coating process of a phosphorescent material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Phosphorescent light-emitting body 11 ... Substrate 12 ... Hole (recess) 13 ... Luminescent material

Claims (3)

[Claims] 1. A light storing material comprising an optically transparent substrate having a recess formed therein, and a light storing material formed by adding a rare earth element to a metal oxide-based sintered material is applied to an inner wall of the recess of the base. Type illuminant. 2. A concave portion is formed in an optically transparent substrate, and a liquid-state light storing material made by adding a rare earth element to a metal oxide-based sintered material is poured into the concave portion of the substrate, and the poured light storing material. A method for producing a phosphorescent light-emitting body, which comprises discharging the material from the recess and then drying and curing the phosphorescent material attached to the inner wall of the recess. 3. The phosphorescent material is mixed with an ultraviolet curing agent to be poured into the recess, and when the phosphorescent material is dried, ultraviolet rays are irradiated to cure the ultraviolet curing agent and simultaneously cure the phosphorescent material. Item 2
A method for producing the above-described phosphorescent light-emitting body.