JP3341532B2 - Afterglow lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an afterglow lamp having an afterglow by coating a divalent Mn-activated afterglow phosphor on the inner surface or the inner surface of the lamp.

[0002]

2. Description of the Related Art Guidance lights are required to be installed in places where many people gather, such as theaters and inns, according to the Fire Service Law enforcement ordinance and fire prevention regulations in cities throughout Japan. When the normal power supply is cut off due to a disaster such as an earthquake or fire or other sudden accident, the power supply is automatically switched to a standby power supply, and lighting for 20 minutes or more is required. However, if the standby power supply is destroyed in a disaster or the power supply circuit is disconnected, the light turns off. In such a case, it is extremely dangerous in a complicated underground shopping mall, in a long tunnel, or in a high-rise building at night. In addition, the conventional guide light has a complicated structure, which requires time and expensive equipment, and is rarely applied to places other than the obligatory places.

[0003] In addition to the above-mentioned emergency, in almost all buildings such as companies, department stores, school buildings, factories, etc., shops, houses, etc., the interiors and corridors of these buildings are almost always used. Alternatively, after turning off the lighting switch on the stairs and before reaching the exit, an inexpensive guide light with a simple structure that allows the feet to be seen can provide a safer and more comfortable life.

On the other hand, Japanese Patent Application Laid-Open No. Sho 58-121088 discloses a technique in which a light accumulator having a property of absorbing and accumulating light energy emitted from a light source is provided on a holding member such as a shade located at a position where light from the light source reaches. No. 6,086,045. The use of this light accumulator eliminates the need for a standby power supply. However, the conventional light accumulator is chemically unstable and has a disadvantage that it is easily deteriorated by ultraviolet rays, high temperature, moisture, and the like. Moreover, the afterglow of these light accumulators is dark and short. Also, the method of applying the light accumulator to the holding member has insufficient brightness.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an induction lamp which does not require a standby power supply, can use long and bright afterglow, and does not require special lighting equipment such as a light accumulator. The purpose is to provide.

[0006]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, a divalent Mn-activated afterglow phosphor is applied to the inner surface or outer surface of the glass tube of the lamp. As a result, they have found that the problem can be solved, and have completed the present invention.

That is, the afterglow lamp of the present invention is a lamp comprising a light-emitting portion for converting electric energy into light energy and a light-transmitting glass covering the light-emitting portion. A phosphor layer is provided on at least one of the phosphor layers, the phosphor layer includes an afterglow phosphor expressed by the following general formula, and the lamp is a fluorescent lamp.
The phosphor layer of the fluorescent lamp, the afterglow phosphor,
And a phosphor that excites it, and the emission color is in the white range.
There is a feature. _{(M 1-p Mn p)} O · nGa 2 O 3 · m (Ge 1-q Si q) O 2 ( although, 0.0001 ≦ p ≦ 0.5 0 ≦ q ≦ 1.0 0 ≦ n ≦ 3 0.00 ≦ m ≦ 3.0 0.5 ≦ m + n ≦ 6.0 M is a divalent metal such as Mg, Ca, Sr, Ba, As, Sn,
And at least one selected from the group consisting of Zn.

The afterglow phosphor used in the afterglow lamp of the present invention is a gallate germanate silicate phosphor activated with divalent Mn (manganese), as described above. By changing the amount of gallic acid, germanic acid, or silicic acid, the emission color tone can be significantly changed. A typical example will be described below.

In the gallate phosphor having m = 0, Ca occupies 70 mol% or more of the divalent metal M, and 0.5 ≦
In the range of n ≦ 1.5, the emission color is yellow and 1.5 ≦
When n ≦ 3.0, the color is orange. Further, Mg occupies 70 mol% or more of M, and in the range of 0.5 ≦ n ≦ 3.0, the emission color is green. These have a wavelength of 450n.
It is excited by light of m or less and emits light.

In the germanate afterglow phosphor in which n = 0 and q = 0, Zn occupies 70 mol% or more of the divalent metal M;
In the range of 0.5 ≦ m ≦ 3.0, the emission color exhibits a green color. This phosphor emits light when excited by light of 480 nm or less.

In a silicate afterglow phosphor in which n = 0 and q = 1, Zn occupies 70 mol% or more of the divalent metal M.
In the range of 5 ≦ m ≦ 3.0, the emission color is green.
This phosphor emits light when excited by light of 420 nm or less.

By adopting a structure in which the afterglow phosphor receives light emitted from the lamp, the afterglow phosphor is excited and emits afterglow light. The light that can be excited from the lamp depends on the chemical composition of the afterglow phosphor, as described above.

[0013] The lamp capable of exciting the afterglow phosphor is fluorescent.
Applicable to lamps. As shown in FIG. 1, an inner phosphor layer (3) in which an afterglow phosphor is applied to an inner surface and / or an outer surface of a translucent glass (2) covering a light emitting portion (1) of each of these lamps. This can be realized by forming the outer phosphor layer (4).

The thickness of the phosphor layer to be applied depends on the particle size of the afterglow phosphor used, but is preferably in the range of 5 to 100 μm. When the phosphor layer is thinner than this range, the afterglow phosphor is hardly applied because the coating amount of the afterglow phosphor is too small. Conversely, if the phosphor layer is thicker than this range, the light of the lamp is blocked by the phosphor layer, and the original function as a lamp for illumination is reduced.

Although all afterglow lamps are designed as described above, particularly for fluorescent lamps, the phosphor in the phosphor layer on the inner surface of the glass tube emits light when excited by ultraviolet rays. Therefore, the ultraviolet energy can be directly used. When an afterglow phosphor is applied to the inner surface of a glass tube, the afterglow phosphor is also directly excited by a 253.7 nm mercury ray emitted from a positive column, which is a light emitting portion of a fluorescent lamp. The afterglow fluorescent lamp can also be obtained by applying the phosphor alone to the fluorescent lamp. In this case, the afterglow is maximized. However, since it is necessary to always use the fluorescent lamp as a normal white fluorescent lamp, it can be said that a structure that is used in combination with a fluorescent material for a fluorescent lamp, receives light emitted from the fluorescent material, and outputs afterglow.

For example, a structure for receiving light emitted from another phosphor will be described with reference to a sectional view of FIG. 2 which is perpendicular to the tube direction of the fluorescent lamp. The phosphor layer (3) formed on the inner surface of the translucent glass (2) mainly converts the electric energy into light energy (in this case, ultraviolet radiation energy) in the light emitting portion (1) of the positive column. Excited. In this case, the afterglow phosphor and the phosphor for illumination capable of exciting it may be completely mixed in the phosphor layer, and this method is the simplest.

As shown in the cross-sectional view of the fluorescent lamp in FIG. 3, an afterglow phosphor layer (31) is formed on the first layer on the inner surface of the translucent glass (2), and the second layer is illuminated. Phosphor layer (3
So-called two-layer coating for forming 2) may be used. According to this method, all the 253.7 nm mercury rays are used to excite the phosphor for the fluorescent lamp, and all the afterglow phosphors are excited by visible light from the phosphor layer. The afterglow lamp obtained in this case has a high luminance even for illumination, and the afterglow has a high luminance.

In addition, as shown in the cross-sectional view of the fluorescent lamp in FIG. 4, a phosphor layer (3) for illumination is formed on the inner surface of the translucent glass (2), and the afterglow fluorescent lamp is formed on the outside of the glass tube. It is also possible to form a body layer (4).

As the phosphor used together with the afterglow phosphor occupying the phosphor layer, those commonly used as phosphors for illumination can be applied. For example, (SrCaBaMg) ₅ (P
O ₄ ) ₃ Cl: Eu, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Sr ₅
(PO ₄ ) ₃ Cl: Eu, LaPO ₄ : Ce, Tb, Mg
Al ₁₁ O ₁₉ : Ce, Tb, Y ₂ O ₃ : Eu, Y (PV) O
_{4: Eu, 3.5MgO · 0.5MgF 2} · GeO 2: Mn, Ca
₁₀ (PO ₄ ) ₆ FCl: Sb, Mn, Sr ₁₀ (PO ₄ ) ₆ F
Cl: Sb, Mn, (SrMg) ₂ P ₂ O ₇ : Eu, Sr ₂
P ₂ O ₇ : Eu, CaWO ₄ , CaWO ₄ : Pb, MgWO
₄ , (BaCa) ₅ (PO ₄ ) ₃ Cl: Eu, Sr ₄ Al ₁₄
O ₂₅ : Eu, Zn ₂ SiO ₄ : Mn, BaSi ₂ O ₅ : P
b, SrB ₄ O ₇ : Eu, (CaZn) ₃ (PO ₄ ) ₂ : T
1, LaPO ₄ : Ce or the like can be used.

For the purpose of exciting the afterglow phosphor, a phosphor emitting red light which emits light mainly at 600 nm or more is not used. This is because even such a long-wavelength phosphor is not excited. However, fluorescent lamps for ordinary lighting often emit light over almost the entire visible range, and when such fluorescent lamps are given persistence,
Even if red light is not necessary for the afterglow phosphor, it is necessary for setting the light color of the fluorescent lamp to a required range.

The phosphor has four points because it can strongly excite the afterglow phosphor, emits light in a white region as a fluorescent lamp for illumination, and can freely change the light color of the fluorescent lamp.
Blue light-emitting phosphor having an emission peak near 50 nm, 54
A green light-emitting phosphor having an emission peak near 5 nm, and 6
A three-wavelength mixed phosphor composed of a red light-emitting phosphor having an emission peak near 10 nm is most preferable. As a blue emitting phosphor _{(SrCaBaMg) 5 (PO 4)} 3 Cl: Eu, and BaMg ₂ Al ₁₆ O _27: Eu is, as the green-emitting phosphor, LaPO _4: Ce, Tb, and MgAl ₁₁ O _19: C
e, Tb phosphor is Y ₂ O ₃ : E as a red light emitting phosphor.
u can be preferably used.

The mixing ratio of the afterglow phosphor occupying the phosphor layer and the phosphor for the fluorescent lamp coexisting therewith can be freely changed depending on the purpose of use. For example, when the purpose for lighting is prioritized, that is, when the lamp luminous flux is prioritized, it can be dealt with by increasing the number of phosphors for the fluorescent lamp,
Conversely, when it is desired to make the afterglow bright and long, it can be realized by increasing the ratio of the afterglow phosphor.

Further, as for the production of the afterglow fluorescent lamp, the usual method for producing a fluorescent lamp can be applied as it is. For example, an afterglow phosphor, a phosphor that coexists with the same and excites the afterglow phosphor, and a binder such as alumina or calcium pyrophosphate or calcium barium borate are added to the nitrocellulose / butyl acetate solution. Are mixed and suspended to prepare a phosphor coating suspension. The obtained phosphor coating suspension is poured into the inner surface of a glass tube, and then dried by passing hot air through the glass tube, followed by baking, exhausting, attaching a filament, attaching a base, and the like. You can finish the lamp.

At the time of coating on a glass tube, it is possible to form a protective film of alumina or the like, and then form a phosphor layer, so that the luminous performance such as luminous flux and luminous flux maintenance ratio can be further improved.

As a raw material of the afterglow phosphor applied to the present invention, metal oxides such as Ga ₂ O ₃ , GeO ₂ , SiO ₂ , MnO, ZnO, or CaCO ₃ , SrCO ₃ , BaC
A compound such as O ₃ , MgCO ₃ , or MnCO ₃ which is easily converted to an oxide by firing at a high temperature is selected. Such compounds include nitrates, oxalates, and hydroxides in addition to carbonates. Since the emission characteristics depend on the purity of the raw materials, the purity of these raw materials needs to be 99.9% or more, and preferably 99.99% or more.

The raw material obtained by mixing these components is fired in the air at a temperature of 1100 ° C. or more and 1400 ° C. or less for several hours, and the obtained fired product is pulverized and sieved to obtain the afterglow phosphor of the present invention. can get. The mixing ratio of the raw materials for obtaining the desired afterglow phosphor composition almost coincides with the theoretical ratio.

The ratio p of the activator Mn to be introduced into the afterglow phosphor for substituting the divalent metal M is related to the afterglow luminance, and for practical use, its concentration range is important. Set to the following range.

Ca occupies 70 mol% or more of the divalent metal M;
In the afterglow phosphor having m ≦ 0.001 and 0.5 ≦ n ≦ 1.5, the emission color exhibits a yellowish color, and the activator Mn amount p is practical in consideration of the emission luminance and the afterglow luminance. From the point of 0.000
It should be set in the range of 1 ≦ p ≦ 0.5 and 0.001
The range of ≦ p ≦ 0.03 is more preferable, and the vicinity of 0.005 is most preferable.

Ca occupies 70 mol% or more of the divalent metal M;
In the afterglow phosphor having m ≦ 0.001, 1.5 ≦ n ≦ 3.0, the emission color exhibits an orange color, and the amount of activator Mn p
Is from the viewpoint of practicality in consideration of light emission luminance and afterglow luminance.
It should be set in the range of 0001 ≦ p ≦ 0.5.
001 ≦ p ≦ 0.03 is more preferable, and 0.00
Around 4 is most preferred.

Mg occupies at least 70 mol% of the divalent metal M,
In the afterglow phosphor having m ≦ 0.001, 0.5 ≦ n ≦ 3.0, the emission color is greenish, and the activator Mn amount p is practical considering the emission luminance and the afterglow luminance. From the point of 0.000
It should be set in the range of 1 ≦ p ≦ 0.5 and 0.001
The range of ≦ p ≦ 0.03 is more preferable, and the vicinity of 0.005 is most preferable.

Zn occupies at least 70 mol% of the divalent metal M,
In the afterglow phosphor satisfying 0.5 ≦ m ≦ 3, n ≦ 0.001, and 0 ≦ q ≦ 1, the emission color exhibits a greenish color, and the activator Mn amount p indicates the emission luminance and the afterglow luminance. Considering practicality,
Should be set in the range of 0.0001 ≦ p ≦ 0.5,
The range of 0.001 ≦ p ≦ 0.05 is more preferable, and the range of 0.
008 is most preferable. In this phosphor, as the value of q is smaller, the excitable wavelength shifts to the longer wavelength side.

[0032]

Conventionally, a ZnS: Cu phosphor has been known as an afterglow phosphor having a relatively long afterglow. However, even if an afterglow lamp is manufactured using this phosphor, the afterglow light flux is produced. Is extremely low, and no luminance that can be used for illumination is obtained. Furthermore, it is impossible to apply a ZnS: Cu phosphor to the phosphor layer of the fluorescent lamp. Further, the ZnS: Cu phosphor is photolyzed by ultraviolet rays, colloidal zinc metal is deposited on the phosphor crystal surface, the appearance is changed to black, and the afterglow luminance is significantly reduced. Further, after the phosphor is applied, a baking step for burning the organic binder is performed by using a ZnS:
The Cu phosphor is oxidized and no longer emits light. Due to such fundamental causes, practical use of this kind of phosphor in a fluorescent lamp is completely impossible.

However, the afterglow phosphor of the present invention has no problem in the photodecomposition of the phosphor by ultraviolet rays as described above and in the baking step at the time of manufacturing a fluorescent lamp. In addition, the phosphor is relatively resistant to mercury adsorption to the phosphor, which is one of the causes of deterioration of the fluorescent lamp during lighting, or to deterioration of the phosphor due to ion bombardment of Ar +, Hg +, or the like generated from the positive column of the fluorescent lamp.

Due to the above-mentioned characteristics, the afterglow fluorescent lamp is a Zn lamp which has been conventionally used as a phosphorescent phosphor.
Although it was not feasible with the S: Cu phosphor,
By using the afterglow phosphor having the specific composition activated by the valence Mn, a practical fluorescent lamp having high luminance afterglow can be provided.

[0035]

【Example】

[Example 1] A three-wavelength mixed phosphor, a yellow light-emitting afterglow phosphor
A case where (Ca _0.995 Mn _0.005 ) _{O.Ga 2} O ₃ is excited to emit light, particularly a case where these phosphors are completely mixed in the phosphor layer of the fluorescent lamp will be described.

As a phosphor material, CaCO_Three99.5
9 g (0.995 mol), Ga_TwoO _Three187.44 g
(1.00 mol), and MnCO_Three0.61 g
(0.005mol) in a ceramic pot and mix
As a medium, put the alumina ball, close the lid and roll
And mixed for 2 hours before firing the phosphor,
Get). Next, raw raw powder is put into a boat-type crucible.
And fired in a tube furnace at 1200 ° C for 3 hours under air atmosphere,
The obtained fired product is pulverized and passed through a 200-mesh sieve to leave the residue.
Obtain a light-emitting phosphor. This phosphor has an emission peak of 578 n.
m shows yellow luminescence.

The obtained afterglow phosphor and (SrCaBaMg) ₅ (PO ₄ ) ₃ C having an emission peak at 453 nm
1: 42% Eu blue-emitting phosphor, 2 LaPO ₄ : Ce, Tb green-emitting phosphor having an emission peak at 544 nm.
Y ₂ O ₃ : Eu having an emission peak at 3% and 611 nm
The three-wavelength mixed phosphor obtained by mixing 35% of the red light-emitting phosphor is sufficiently mixed at a ratio of 1: 3.

To 20 g of the mixed phosphor, 15 g of a nitrocellulose / butyl acetate binder is sufficiently mixed in a porcelain pot to prepare a phosphor coating slurry. This was poured into a glass tube, applied to the inner surface thereof, dried with warm air, and baked at 580 ° C. for 15 minutes to form a fluorescent film. The amount of phosphor applied per fluorescent lamp was 5.0 g. After that, according to the usual method, exhaust, mounting of the filament, and mounting of the base are performed.
An S fluorescent lamp was manufactured. Table 1 summarizes the measured values of the obtained afterglow fluorescent lamps. Here, the afterglow luminous flux is a measured value 5 minutes after the light is turned off.

Example 2 A case of so-called two-layer coating in which an afterglow phosphor is applied to a first layer and a three-wavelength mixed phosphor is applied to a second layer will be described below. Was added Example 1 was prepared by _{(Ca 0.995 Mn 0.00 5) O} · Ga 2 O 3 phosphor nitrocellulose / butyl acetate binder 15g to 12g, to prepare a sufficiently mixed phosphor coating slurry in a porcelain pot. This is poured into a glass tube, applied to the inner surface, and dried by warm air. By this operation, the coating amount of the afterglow phosphor of the first layer was 3 g. Next, (SrCaBaMg) ₅
46% of (PO ₄ ) ₃ Cl: Eu blue light emitting phosphor, LaP
O ₄ : 23% of Ce, Tb green light emitting phosphor, and Y
50 g of an aqueous polyethylene oxide solution is added to 30 g of a three-wavelength mixed phosphor obtained by mixing 31% of a ₂ O ₃ : Eu red light-emitting phosphor, and the mixture is sufficiently mixed in a porcelain pot to prepare a phosphor coating slurry. Pour this into a glass tube,
Apply to the inner surface and dry through warm air. By this operation, the application amount of the three-wavelength mixed phosphor of the second layer was 3 g. After that, exhaustion, installation of a filament, and installation of a base were performed in accordance with a usual method, to produce a FL40SS fluorescent lamp. Table 1 summarizes the measured values of the obtained fluorescent lamps.

[Example 3] In the case where a green-emitting afterglow phosphor (Mg _0.995 Mn _0.005 ) _{O.Ga 2} O ₃ is excited and emitted by a three-wavelength mixed phosphor, these fluorescent lights are particularly emitted in a phosphor layer of a fluorescent lamp. The case where the body is completely mixed will be described.

40.1 g of MgO as a phosphor material
(0.995 mol), 187.44 g of Ga ₂ O ₃
(1.00 mol) and 0.61 g of MnCO ₃
(0.005 mol) is put in a ceramic pot, alumina balls are put as a mixing medium, the lid is closed, and the mixture is mixed with a roller for 2 hours to obtain a mixed raw material before phosphor firing (hereinafter referred to as raw raw powder). Next, the raw raw powder is placed in a boat-type crucible and fired at 1200 ° C. for 3 hours in an air atmosphere in a tubular furnace.
The obtained fired product is pulverized and passed through a 200-mesh sieve to obtain an afterglow phosphor. This phosphor has an emission peak of 510 n.
Shows green emission at m.

The obtained afterglow phosphor and (SrCaBaMg) ₅ (PO ₄ ) ₃ C having an emission peak at 453 nm
1: 25.7% of Eu blue-emitting phosphor, 17.3% of LaPO ₄ : Ce, Tb green-emitting phosphor having an emission peak at 544 nm, and Y ₂ having an emission peak at 611 nm.
A three-wavelength mixed phosphor obtained by mixing O ₃ : Eu red light-emitting phosphor at 57.0% is sufficiently mixed at a ratio of 1: 3,
An afterglow fluorescent lamp was produced in the same manner as in Example 1, and the measurement results are summarized in Table 1.

[0043] [Example 4] three band phosphor mixture in a green light emitting afterglow phosphor (Zn _0.99 2Mn _0.00 8) · case where the 0.5GeO ₂ excite to emit light, in particular those phosphor phosphor layer of a fluorescent lamp Will be described.

161.48 ZnO was used as a phosphor material.
g (1.984 mol), 104.61 g of GeO ₂
(1.00 mol) and 1.95 g of MnCO ₃
(0.016 mol) is placed in a ceramic pot, alumina balls are placed as a mixing medium, the lid is closed, and the mixture is mixed with a roller for 2 hours to obtain a mixed raw material before phosphor firing (hereinafter referred to as raw raw powder). Next, the raw raw powder is placed in a boat-type crucible and fired at 1200 ° C. for 3 hours in an air atmosphere in a tubular furnace.
The obtained fired product is pulverized and passed through a 200-mesh sieve to obtain an afterglow phosphor. This phosphor has an emission peak of 550 n.
Shows green emission at m.

The obtained afterglow phosphor and (SrCaBaMg) ₅ (PO ₄ ) ₃ C having an emission peak at 453 nm
1: 37.0% Eu blue-emitting phosphor, 10.0% LaPO ₄ : Ce, Tb green-emitting phosphor having an emission peak at 544 nm, and Y ₂ having an emission peak at 611 nm.
The three-wavelength mixed phosphor obtained by mixing 53.0% of O ₃ : Eu red light-emitting phosphor is sufficiently mixed at a ratio of 1: 3,
An afterglow fluorescent lamp was produced in the same manner as in Example 1, and the measurement results are summarized in Table 1.

[0046]

[Table 1]

Comparative Example 1 15 g of nitrocellulose / butyl acetate binder was added to 12 g of ZnS: Cu phosphor and mixed well in a porcelain pot to prepare a phosphor coating slurry. This is poured into a glass tube, applied to the inner surface, and dried by warm air. By this operation, the coating amount of the afterglow phosphor of the first layer was 3 g. Next, (SrCa
BaMg) ₅ (PO ₄ ) ₃ Cl: Eu blue emitting phosphor
0.2% LaPO ₄ : Ce, Tb green light-emitting phosphor
9.4% and 40.4% of Y ₂ O ₃ : Eu red light emitting phosphor.
%, And 50 g of an aqueous solution of polyethylene oxide is added to 12 g of the three-wavelength mixed phosphor obtained by mixing the two, and the mixture is sufficiently mixed in a porcelain pot to prepare a phosphor coating slurry. This is poured into a glass tube, applied to the inner surface, and dried by warm air. As a result of this operation, the coating amount of the second-layer three-wavelength mixed phosphor was 3 g. After that, in accordance with the usual method, exhaust, attach the filament, attach the base,
A 40SS fluorescent lamp was made. The obtained fluorescent lamp was darkened as a whole and the luminous flux was extremely low, so that a fluorescent lamp having commercial value could not be obtained.

Comparative Example 2 ZnS:
A Cu phosphor is selected and (SrCaBaMg) ₅ (PO ₄ )
₃ Cl: Eu 34.1% of blue-emitting phosphor, LaPO _4:
16.8% of Ce, Tb green light emitting phosphor, and Y ₂ O ₃ :
A three-wavelength mixed phosphor obtained by mixing 49.1% of the Eu red-emitting phosphor was sufficiently mixed at a ratio of 1: 3, and a FL40SS fluorescent lamp was manufactured in the same manner as in Example 1.
The obtained fluorescent lamp was darkened as a whole, and the luminous flux of the lamp was extremely low, so that a fluorescent lamp of commercial value could not be obtained.

[0049]

According to the present invention, it is possible to provide an afterglow lamp which can use long and bright afterglow without requiring an auxiliary power supply in an emergency.

By applying this afterglow fluorescent lamp to a guide light, there is no need for a special lighting device such as a light accumulator, and the existing lighting device can be used as it is, which is very economical. It is a target. As a result, it is possible to reduce the economical restrictions associated with selecting the installation location of the guide light.

Also, the present invention is effective even when used by being incorporated in a conventional guide light with a backup power supply. Even if the backup power supply or the power supply circuit is cut off due to a disaster, it functions as a guide light and is extremely reliable. High guide lights can be provided.

Furthermore, when used for lighting indoors, corridors or stairs, not only in an emergency, but also after lighting the switch, the afterglow of high brightness continues for a while. Can be used as lighting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an afterglow lamp of the present invention.

FIG. 2 is a cross-sectional view of the afterglow lamp of the present invention.

FIG. 3 is a cross-sectional view of the afterglow lamp of the present invention.

FIG. 4 is a cross-sectional view of the afterglow lamp of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light-emitting part 2 ... Translucent glass 3 ... Inner phosphor layer 4 ... Outer phosphor layer 31 ... Afterglow Phosphor layer 32 phosphor phosphor layer for lighting

Continuation of the front page (56) References JP-A-63-308089 (JP, A) JP-A-5-41058 (JP, U) JP-B-46-30804 (JP, B1) JP-B-46-30805 (JP) , B1) JP 4934585 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61/44

Claims (2)

(57) [Claims] 1. A light-emitting portion that converts electric energy into light energy and a lamp made of a light-transmitting glass covering the light-emitting portion, wherein a phosphor layer is provided on at least one of an inner surface and an outer surface of the light-transmitting glass. The phosphor layer includes an afterglow phosphor expressed by the following general formula, and the lamp is a fluorescent lamp;
A phosphor layer, wherein the afterglow phosphor, and fluorescence that excites the phosphor
Characterized in that the light emission color is in the white region.
Light lamp. _{(M 1-p Mn p)} O · nGa 2 O 3 · m (Ge 1-q Si q) O 2 ( although, 0.0001 ≦ p ≦ 0.5 0 ≦ q ≦ 1.0 0 ≦ n ≦ 3 0.00 ≦ m ≦ 3.0 0.5 ≦ m + n ≦ 6.0 M is at least one selected from the group consisting of Mg, Ca, Sr, Ba, As, Sn, and Zn. 2. The phosphor layer comprises the afterglow phosphor, a blue light-emitting phosphor having an emission peak near 450 nm, a green light-emitting phosphor having an emission peak near 545 nm, and an emission peak near 610 nm. The afterglow lamp according to claim 1, comprising at least one of a three-wavelength mixed phosphor made of a red light-emitting phosphor.