JPH09291280A - Fluorescent substance and fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fluorescent substance capable of improving luminous brightness and improving luminous efficiency and color-rendering properties and provide a fluorescent lamp using the fluorescent substance. SOLUTION: This fluorescent substance is represented by the formula (Ba1-a , Eua )O.bAl2 O3 .cRe2 O3 [0.01<=a<=0.10; 3<=b<=5; 0<c<=0.03; Re is at least one kind of element selected from Sm and Tm]. The value (c) is preferably >=0.005 and <0.03. The fluorescent lamp forms a fluorescent film 2 containing the fluorescent substance in the inside of a glass bulb 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blue-green light emitting aluminate-based phosphor activated by divalent europium and a fluorescent lamp using the phosphor, and more particularly to improving the emission brightness and the emission efficiency. Also, the present invention relates to a phosphor capable of obtaining a fluorescent lamp having excellent color rendering properties and a fluorescent lamp using the phosphor.

[0002]

2. Description of the Related Art As a fluorescent lamp for general illumination, a three-wavelength type fluorescent lamp which has a high efficiency and a high color rendering property at the same time is widely used. This three-wavelength type fluorescent lamp is formed by forming a phosphor layer in which three kinds of phosphors of blue, green, and red light emission having a relatively narrow spectral distribution are mixed at an arbitrary ratio to obtain a target color. It is a fluorescent lamp that emits light.

In recent years, in order to improve the efficiency and color rendering of the above-mentioned three-wavelength fluorescent lamp, a phosphor having an emission peak in the wavelength region of 480 to 500 nm has been particularly desired.
That is, the color rendering of the three-wavelength fluorescent lamp is determined by the type of the light emitting component of the phosphor and the spectral distribution formed by the mercury emission line due to mercury discharge. However, in order to improve the color rendering property, it is considered most effective to enhance the energy emitted in the wavelength region near 500 nm in the spectral distribution.

As a blue-green light emitting component capable of improving the color rendering properties, for example, as shown in Japanese Patent Publication No. 6-85313, a phosphor represented by the general formula ΒaAl ₈ O ₁₃ : Eu is known. This phosphor has an emission peak wavelength of 480.
It is a new type of aluminate phosphor existing in nm.

[0005]

However, the above-mentioned conventional blue-green light-emitting phosphor (ΒaAl ₈ O ₁₃ : Eu) is still insufficient in the emission intensity in the blue-green region and has not reached a practical level. The current situation. Therefore, even in the case of forming a three-wavelength fluorescent lamp by containing this phosphor in the fluorescent film, there is a problem that it is extremely difficult to improve the efficiency and color rendering of the fluorescent lamp, and in the blue-green region. It has been a technical subject to develop a high brightness phosphor having high emission energy.

The present invention has been made in order to solve the above problems, and particularly uses a phosphor capable of improving the emission brightness and improving the luminous efficiency and color rendering of a fluorescent lamp and the phosphor. An object is to provide a fluorescent lamp.

[0007]

In order to achieve the above object, the present inventor added various elemental components to BaAl ₈ O ₁₃ : Eu-based phosphors to prepare phosphors having various compositions. A fluorescent lamp having a light emitting layer formed by using these phosphor compositions was prepared, and the effects of the type and amount of the added elements on the luminous efficiency and color rendering of each fluorescent lamp were compared and investigated by experiments.

As a result, when samarium (Sm) or thulium (Τm) is solid-dissolved in the βaAl ₈ O ₁₃ : Eu type phosphor, a phosphor showing high emission energy under the excitation of ultraviolet rays of 254 nm wavelength is obtained. It was found that when this phosphor is contained in the light emitting layer of a lamp, a fluorescent lamp excellent in light emission efficiency and color rendering can be obtained for the first time.
The present invention has been completed based on the above findings.

That is, the phosphor according to the present invention has the general formula
(Ba _1-a , Eu _a ) O · bAl ₂ O ₃ · cRe ₂ O ₃
(However, 0.01 ≦ a ≦ 0.10, 3 ≦ b ≦ 5, 0 <c
≤0.03, Re is represented by at least one element selected from Sm and Tm. Further, when the c value is 0.005 or more and less than 0.03,
More desirable.

Furthermore, the fluorescent lamp according to the present invention has the general formula (Ba _1-a , Eu _a ) O.bAl ₂ O ₃ .cRe ₂ O.
₃ (However, 0.01 ≦ a ≦ 0.10, ₃ ≦ b ≦ 5,0 <
c ≦ 0.03, Re is characterized in that a phosphor film containing a phosphor represented by at least one element selected from Sm and Tm) is formed on the inner surface of the glass bulb.

Here, the europium-activated barium aluminate component ((Βa _1-a , Eu _a ) O.bAl ₂ O ₃ ) is
It is a component that brings about high emission energy in the blue-green region by being irradiated with ultraviolet rays having a wavelength of 254 nm.

Eu (europium) acts as an activator (activator) for increasing the luminous efficiency of the phosphor, and is added in an atomic ratio a of 0.01 to 0. 10 with respect to βa (barium). . If the addition ratio is less than 0.01, the effect of improving the luminous efficiency is small. -On the other hand, if the addition ratio exceeds 0.10.
Coloring is likely to occur, and the emission efficiency of the lamp is rather hindered by the concentration quenching of europium.

On the other hand, when the component ratio b of Al ₂ O ₃ is less than 3 or exceeds 5 in terms of molar ratio, the secondary phase is likely to appear and the emission characteristics are deteriorated. Therefore Αl
The component ratio b of ₂ O ₃ is set in the range of 3-5. The oxide Sm and Τm constituting the (Re ₂ O _3), by solid solution in the phosphor has the effect to increase the luminous energy in the blue-green region, oxide (Re ₂ O ₃₎
The converted component ratio c (molar ratio) is set to 0.03 or less. This is because if the component ratio c becomes excessively large, exceeding 0.03, a non-emission phase appears and the emission intensity becomes insufficient. The more preferable range of the component ratio c is 0.005 or more and less than 0.03.

The phosphor according to the present invention is manufactured by mixing the following various phosphor raw materials so as to have a predetermined component composition. That is, barium oxide (BaO) or Ba
Compounds that easily generate BaO by heat treatment such as oxides, carbonates, and nitrates of aluminum, and by heat treatment such as aluminum oxide (Al ₂ O ₃ ) or aluminum hydroxide and nitrates Al ₂ O
Compound that produces ₃ and europium oxide (Eu
₂ O ₃ ) or europium carbonate, nitrate, etc. that easily generate Eu ₂ O ₃ by heat treatment, and samarium oxide (Sm ₂ O ₃ ) or samarium carbonate, nitrate, etc. A compound that easily forms Sm ₂ O ₃ by heat treatment, and a compound that easily forms Tm ₂ O ₃ by heat treatment such as thulium oxide (Τm ₂ O ₃ ) or a carbonate or nitrate of thulium. Is weighed by a predetermined amount, boric acid or boric anhydride as a flux is added, and they are sufficiently mixed to prepare a raw material mixture. Thereafter, the raw material mixture is filled in a heat-resistant container such as a crucible and fired in a reducing atmosphere at a temperature of 1100 to 1300 ° C. for 2 to 8 hours. Next, the obtained fired product is pulverized to have a particle size of 4 to 7 μm,
Further, the phosphor according to the present invention can be obtained by performing washing treatment and drying treatment.

Further, the phosphor is uniformly dispersed in a water-soluble binder in which polyethylene oxide or the like is dissolved to prepare a phosphor slurry. The phosphor slurry is applied to the inner surface of the glass bulb, dried and fired to form a light emitting layer. The fluorescent lamp according to the present invention is manufactured according to a normal lamp manufacturing process in which the (fluorescent film) is integrally formed.

In addition, the phosphor according to the present invention is
It is also possible to form a three-wavelength fluorescent lamp (neutral white fluorescent lamp) by forming a light emitting layer by mixing the green and red light emitting phosphors at an arbitrary ratio.

According to the phosphor and the fluorescent lamp having the above structure, since the BaAl ₈ O ₁₃ : Eu-based phosphor contains at least one of samarium (Sm) and thulium (Tm) as a solid solution, it is blue-green. It becomes possible to significantly increase the emission intensity (luminance) in a region, and when this fluorescent substance is contained in a fluorescent film to form a fluorescent lamp, the luminous efficiency and color rendering of the fluorescent lamp can be greatly improved. .

[0018]

Next, embodiments of the present invention will be described more specifically with reference to the following examples.

Example 1 As a phosphor material, 0.92 mol of ΒaCΟ ₃ powder, A
l ₂ O ₃ powder 4.00 mol, Eu ₂ O ₃ powder 0.
04 mol, Sm ₂ O ₃ powder 0.03 mol, H ₃ B
0.02 mol of O ₃ powder was weighed and thoroughly mixed with a mixer to prepare a raw material mixture. Next, the raw material mixture was filled in an alumina crucible and fired at a temperature of 1200 ° C. for 4 hours in a reducing atmosphere composed of 3 vol.% Hydrogen and 97 vol.% Nitrogen. Further, the obtained calcined product was pulverized by a ball mill and further subjected to hot water washing treatment to obtain a composition formula (Ba _0.92 , E) as shown in Table 1.
_{u 0.08) Ο · 4Αl 2 O} 3 · 0.03Sm phosphor according to the embodiment 1 represented by ₂ O ₃ was prepared.

In order to evaluate the characteristics of this phosphor, the phosphor was irradiated with ultraviolet rays having a wavelength of 254 nm to excite it, and the emission spectrum and the deterioration characteristics of the obtained emission spectrum were measured. As a result, the emission brightness (powder brightness) of the phosphor according to Example 1 was (Ba _0.92 , Eu _0.08 ) O for the conventional phosphor containing no Sm ₂ O ₃ (Comparative Example 1 described later).
.1 of the emission brightness of a phosphor having a composition of 4A1 ₂ O ₃
It was 10%, and the result was that the luminous efficiency was significantly increased.

Further, the phosphor of Example 1 is uniformly dispersed in a binder to prepare a phosphor slurry, and the phosphor slurry is applied to the inner surface of the glass bulb 1 as shown in FIG. 1 and dried / baked. After forming the fluorescent film 2 by performing the above, the discharge electrode 3 is formed in accordance with a normal lamp manufacturing process.
The fluorescent lamp according to Example 1 was manufactured through steps such as mounting the glass bulb on both ends of the glass bulb 1.

Then, with respect to the manufactured fluorescent lamp, the emission intensity L2 immediately after the production and the emission intensity L3 after the lighting for 1000 hours were measured, and the ratio (L3 / L2) of the emission intensity after the lighting for 1000 hours to the initial value was maintained. It was calculated as a rate. Table 1 shows the measurement calculation results.

The emission intensity immediately after the production of the fluorescent lamp according to Example 1 is that of a conventional phosphor (Ba _0.92 , Eu).
_O.08) was 113% with respect to O · 4Αl ₂ O ₃ light-emitting intensity of the fluorescent lamp according to Comparative Example 1 using (100%). Further, the maintenance ratio of the emission intensity after lighting for 1000 hours was 0.90, which was significantly improved compared with 0.80 of Comparative Example 1, and a fluorescent lamp having excellent emission efficiency was obtained.

Example 2 As a phosphor material, 0.94 mol of BaCO ₃ powder was added,
1 ₂ O ₃ powder 3.50 mol and Eu ₂ O ₃ powder 0.
04 mol, 0.02 mol of Tm ₂ O ₃ powder, Η ₃ Β
0.02 mol of O ₃ powder was weighed and thoroughly mixed with a mixer to prepare a raw material mixture. Next, as in Example 1, the raw material mixture was filled in an alumina crucible and fired at a temperature of 1200 ° C. for 4 hours in a reducing atmosphere composed of 3 vol.% Hydrogen and 97 vol.% Nitrogen. did. Further, the obtained calcined product was crushed by a ball mill and subjected to a hot water washing treatment to obtain a compositional formula (Βa _0.94 , Eu _0.06 ) O · 3.5ΑI ₂ O ₃ · as shown in Table 1.
A phosphor according to Example 2 represented by 0.02 Tm ₂ O ₃ was prepared.

In order to evaluate the characteristics of this phosphor, the phosphor was irradiated with ultraviolet rays having a wavelength of 254 nm to be excited, and the emission spectrum and the deterioration characteristics of the obtained emission spectrum were measured. As a result, the emission brightness (powder brightness) of the phosphor according to Example 2 is (Ba _0.94 , Eu _O.06 ) O.3.5Al ₂ O ₃ with the conventional phosphor containing no Tm ₂ O ₃ . It was 113% of the emission brightness of the phosphor having the composition, and the result was that the emission efficiency was significantly increased.

Further, the phosphor of Example 2 was uniformly dispersed in a binder to prepare a phosphor slurry, and this phosphor slurry was applied to the inner surface of the glass bulb 1 and dried / baked as in Example 1. After forming the fluorescent film 2 by performing the above, the discharge electrode 3 is formed in accordance with a normal lamp manufacturing process.
The fluorescent lamp according to Example 2 was manufactured through steps such as mounting the glass bulb on both ends of the glass bulb 1.

With respect to the manufactured fluorescent lamp, the emission intensity L2 immediately after the production and the emission intensity L3 after the lighting for 1000 hours were measured, and the ratio (L3 / L2) of the emission intensity after the lighting for 1000 hours to the initial value was maintained. It was calculated as a rate. Table 1 shows the measurement calculation results.

The emission intensity of the fluorescent lamp according to Example 2 immediately after its production was that of a conventional phosphor (Ba _0.94 , Eu).
_O.06 ) 115% with respect to the emission intensity (100%) of the fluorescent lamp using O.3.5Al ₂ O ₃ . Also,
The maintenance factor of the emission intensity after lighting for 1000 hours is also 0.9.
2, which is a significant improvement over 0.80 of the conventional example, and a fluorescent lamp having excellent luminous efficiency was obtained.

Example 3 0.94 mol of βaCO ₃ powder as a phosphor raw material,
l ₂ O ₃ powder was added to 5.00 mol and Eu ₂ O ₃ powder was added to 0.
03 mol, 0.01 mol of Sm ₂ O ₃ powder, H ₃ β
0.02 mol of O ₃ powder was weighed and thoroughly mixed with a mixer to prepare a raw material mixture. Next, in the same manner as in Example 1, this raw material mixture was filled in an alumina crucible and fired at a temperature of 1200 ° C. for 4 hours in a reducing atmosphere composed of 3 vol.% Hydrogen and 97 vol.% Nitrogen. did. Further, the obtained calcined product was crushed by a ball mill and further subjected to hot water washing treatment to obtain a composition formula (Βa _0.94 , Eu _0.06 ) O · 5Al ₂ O ₃ · 0.0 as shown in Table 1.
A phosphor according to Example 3 represented by 1Sm ₂ O ₃ was prepared.

In order to evaluate the characteristics of this phosphor, the phosphor was irradiated with ultraviolet rays having a wavelength of 254 nm to excite it, and the emission spectrum and the deterioration characteristics of the obtained emission spectrum were measured. As a result, the emission brightness (powder brightness) of the phosphor according to Example 3 was (Ba _0.94 , Eu _O.06 ) O · 5Al ₂ O _{3 in the} conventional phosphor containing no Sm ₂ O _3. It was 115% of the emission brightness of the phosphor, and it was clear that the emission efficiency was significantly increased.

Further, the phosphor of Example 3 was uniformly dispersed in a binder to prepare a phosphor slurry, and this phosphor slurry was applied to the inner surface of the glass bulb 1 and dried as in Example 1. After forming the fluorescent film 2 by firing, the fluorescent lamp according to Example 3 was manufactured through steps such as mounting the discharge electrodes 3 on both ends of the glass bulb 1 according to a normal lamp manufacturing process. .

Then, the emission intensity L2 immediately after production and the emission intensity L3 after 1000 hours of lighting of the manufactured fluorescent lamp were measured, and the ratio (L3 / L2) of the emission intensity after 1000 hours of lighting to the initial value was measured. It was calculated as the maintenance rate. Table 1 shows the measurement calculation results.

The emission intensity immediately after the production of the fluorescent lamp according to Example 3 is that of a non-served phosphor (Ba _0.94 , Eu).
_O.06 ) It was 120% with respect to the emission intensity (100%) of the fluorescent lamp using O.5Al ₂ O ₃ . Also, 10
The maintenance ratio of the emission intensity after the lamp was lit for 00 hours was 0.93, which was significantly improved as compared with 0.80 of the conventional example, and a fluorescent lamp having excellent emission efficiency was obtained.

Example 4 0.90 mol of βaCO ₃ powder as a phosphor raw material,
l ₂ O ₃ powder was added to 5.00 mol and Eu ₂ O ₃ powder was added to 0.
05 mol, 0.01 mol of Τm ₂ O ₃ powder, Η ₃ Β
0.02 mol of O ₃ powder was weighed and thoroughly mixed with a mixer to prepare a raw material mixture. Next, as in Example 1, the raw material mixture was filled in an alumina crucible and fired at a temperature of 1200 ° C. for 4 hours in a reducing atmosphere composed of 3 vol.% Hydrogen and 97 vol.% Nitrogen. did. Further, the obtained calcined product was crushed by a ball mill and subjected to a hot water washing treatment to obtain a compositional formula (Βa _0.90 , Eu _O.10 ) O · 5Al ₂ O ₃ · 0.0 as shown in Table 1.
A phosphor according to Example 4 represented by 1 Tm ₂ O ₃ was prepared.

In order to evaluate the characteristics of this phosphor, the phosphor was irradiated with ultraviolet rays having a wavelength of 254 nm to excite it, and the emission spectrum and the deterioration characteristics of the obtained emission spectrum were measured. Fluorescent result, the emission brightness of the phosphor according to Example 4 (Powder luminance) is having .tau.m ₂ O ₃ in the conventional phosphor containing no ([beta] A _0.90, Eu _0.10) becomes O · 5Al ₂ O ₃ composition The result was 110% of the luminous intensity of the body, and the result was that the luminous efficiency was significantly increased.

Also, the phosphor of Example 4 was uniformly dispersed in a binder to prepare a phosphor slurry, and this phosphor slurry was applied to the inner surface of the glass bulb 1 and dried as in Example 1. After forming the fluorescent film 2 by firing, the fluorescent lamp according to Example 4 was manufactured through steps such as mounting the discharge electrodes 3 on both ends of the glass bulb 1 in accordance with a normal lamp manufacturing process. .

For the manufactured fluorescent lamp, the emission intensity L2 immediately after production and the emission intensity L3 after 1000 hours of lighting were measured, and the ratio (L3 / L2) of the emission intensity after 1000 hours of lighting to the initial value was maintained. It was calculated as a rate. Table 1 shows the measurement calculation results.

The emission intensity immediately after the production of the fluorescent lamp according to Example 4 is that of the phosphor produced in USA (Ba _0.90 , Eu).
It was 113% with respect to the emission intensity (100%) of the fluorescent lamp using _0.10 ) O · 5Al ₂ O ₃ . Also, 10
The maintenance factor of the emission intensity after lighting for 00 hours was 0.90, which was significantly improved as compared with 0.80 of the conventional example, and a fluorescent lamp having excellent emission efficiency was obtained.

Examples 5 to 10 Sm ₂ O ₃ powder and T used as the phosphor raw material powder
According to the same procedure as in Example 1, except that the compounding amount of at least one of the m ₂ O ₃ powders was changed to finally obtain the composition shown in Table 1, each of Examples 5 to 10 was performed.
Was prepared.

Comparative Examples 1 to 3 On the other hand, the phosphor according to Comparative Example 1 was prepared in the same manner as in Example 1 except that Sm ₂ O ₃ was not added at all in Example 1. The Sm ₂ O ₃ used in Example 1 was used.
A phosphor according to Comparative Example 2 was prepared in the same manner as in Example 1, except that 0.02 mol of Y ₂ O ₃ powder was added instead. Further, a phosphor according to Comparative Example 3 was prepared in the same manner as in Example 1 except that 0.02 mol of Gd ₂ O ₃ powder was added instead of Sm ₂ O ₃ used in Example 1.

FIG. 2 is a graph showing the spectral distributions of the phosphors according to Example 6 and Comparative Example 1 described above. The phosphor of Example 6 emits light larger than that of the phosphor of Comparative Example 1 in the wavelength range of 480 nm. It has a peak.

Using the phosphors according to Examples 5 to 10 and Comparative Examples 1 to 3 thus prepared, and according to the same procedure as in Example 1, Examples 5 to 10 and Comparative Examples 1 to 3 were carried out. A fluorescent lamp was manufactured.

Then, for each manufactured fluorescent lamp,
In the same manner as in Example 1, the emission intensity L2 immediately after production and the emission intensity L3 after 1000 hours of lighting were measured,
The ratio (L3 / L2) of the emission intensity after 1000 hours of lighting to the initial value was calculated as the maintenance rate. Table 1 below shows the measurement calculation results.

[0044]

[Table 1]

As is clear from the results shown in Table 1 above,
In the phosphors of the respective examples in which at least one element of Sm and Tm among the rare earth elements is dissolved, the powder brightness is significantly higher than that of the phosphor of Comparative Example 1 not containing the above elements. It was confirmed that it could be improved. Also, when a fluorescent lamp is manufactured using the phosphors of the respective examples, the emission intensity immediately after the production and after lighting for a predetermined time is significantly increased as compared with Comparative Example 1, and the emission efficiency is excellent. It was found that a fluorescent lamp with little deterioration can be obtained.

On the other hand, in the phosphors according to Comparative Examples 2 and 3 to which Y or Gd is added even if it is a rare earth element, the powder brightness and the emission intensity of the fluorescent lamp are insufficient, and the effect of improving the lamp characteristics is small. It has been found.

Next, each of the blue-green light emitting phosphors prepared as described above is mixed with other red, blue and green light-emitting phosphors to obtain a day-white light-emitting phosphor. The effect of forming the lamp will be described by the following examples.

Examples 11 to 20 and Comparative Examples 4 to 6 Examples 1 to 10 and Comparative Example 1 having the compositions shown in Table 1.
3 to 5% by weight of each phosphor, and 15.0% by weight of the blue-emitting phosphor powder with respect to each phosphor.
By mixing 34.0% by weight of the green light emitting phosphor powder and 46.0% by weight of the red light emitting phosphor powder and uniformly mixing them, Examples 11 to 20 as shown in Table 2 respectively.
And the daylight white light emitting mixed phosphors according to Comparative Examples 4 to 6 were prepared.

Next, in the same manner as in Example 1, a step of uniformly dispersing each daylight-emitting mixed phosphor into a binder solution to obtain a phosphor slurry, coating the slurry on the inner surface of the glass bulb, and drying / baking After that, daytime white fluorescent lamps according to Examples 11 to 20 and Comparative Examples 4 to 6 were manufactured.

Then, with respect to each of the manufactured neutral white fluorescent lamps, the emission intensity L1 immediately after the production and the emission intensity L2 after 1000 hours of lighting were measured in the same manner as in Example 1, and the initial emission intensity after 1000 hours of illumination was measured. The ratio (L2 / L1) to the value was calculated as the maintenance ratio, and the average color rendering index was measured. The measurement calculation results are shown in Table 2 below.

[0051]

[Table 2]

As is clear from the results shown in Table 2 above,
Example 11 containing the phosphor of each Example in which at least one element of Sm and Tm among the rare earth elements is dissolved.
It was confirmed that in the daylight white fluorescent lamps of Nos. 20 to 20, the emission intensity is significantly improved as compared with the cases of Comparative Examples 4 to 6 using the phosphors of Comparative Examples 1 to 3 not containing the above element. did it. Further, the emission intensity immediately after production and after lighting for a predetermined time was significantly increased as compared with Comparative Examples 4 to 6, and it was found that a daylight white fluorescent lamp having excellent emission efficiency can be obtained.

Further, the average color rendering index of the daylight white fluorescent lamps according to Examples 11 to 20 are all higher than the index 85 of the daylight white fluorescent lamp according to the conventional Comparative Example 4, You can get a good daylight that is closer to natural light.
It was found that the color reproducibility was excellent.

[0054]

As described above, according to the phosphor and the fluorescent lamp of the present invention, at least one of samarium (Sm) and thulium (Tm) is dissolved in the BaAl ₈ O ₁₃ : Eu phosphor. Therefore, it becomes possible to significantly increase the emission intensity (luminance) in the blue-green region, and when this phosphor is included in the fluorescent film to form a fluorescent lamp, the luminous efficiency and color rendering of the fluorescent lamp are improved. It can be greatly improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a fluorescent lamp including a fluorescent film containing a phosphor according to the present invention.

FIG. 2 shows the spectral distribution of the phosphor according to Example 6 as compared with Comparative Example 1
The graph shown together with the phosphor of FIG.

[Explanation of symbols]

 1 glass bulb 2 fluorescent film 3 electrode

Claims (3)

[Claims] 1. A general formula (Ba _1-a , Eu _a ) O · bA
l ₂ O ₃ · cRe ₂ O ₃ (where 0.01 ≦ a ≦ 0.1
0,3 ≦ b ≦ 5, 0 <c ≦ 0.03, Re is represented by at least one element selected from Sm and Tm). 2. The phosphor according to claim 1, wherein the c value is 0.005 or more and less than 0.03. 3. A general formula (Ba _1-a , Eu _a ) O · bA
l ₂ O ₃ · cRe ₂ O ₃ (where 0.01 ≦ a ≦ 0.1
0, 3 ≤ b ≤ 5, 0 <c ≤ 0.03, Re is a phosphor represented by at least one element selected from Sm and Tm) is formed on the inner surface of the glass bulb. Characteristic fluorescent lamp.