JP2003288860A - Binder composite for lamp, fluorescent lamp, and high luminance discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a luminous efficiency in the lamp having a fluorescent substance layer. <P>SOLUTION: The fluorescent substance layer 12 is formed with the three wavelength region light-emitting type fluorescent particles 12a having been bound by a binder 12b. The binder 12b is made of a basic material of a mixture of calcium-barium borate and calcium pyrophosphate, and a light-emitting substance that converts the ultraviolet rays of a wavelength of 254 nm into the ultraviolet rays of longer wavelength or a visible light is dissolved in this basic material. As a light-emitting substance, an oxide of an element selected from gadolinium (Gd), terbium (Tb), europium (Eu), neodymium (Nd), and dysprosium (Dy) belonging to lanthanoid, and an oxide of an element selected from thallium (Tl), Tin (Sn), lead (Pb), and bismuth (Bi) belonging to 3B, 4B, 5B groups are suggested. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fluorescent lamp having a phosphor layer, a high-intensity discharge lamp, and a binder composition for a lamp.

[0002]

2. Description of the Related Art Fluorescent lamps and HID are widely known as highly efficient lamps. The fluorescent lamp is equipped with an arc tube in which mercury and a rare gas are enclosed and a phosphor is adhered to the inner surface, and by discharging in the arc tube, ultraviolet light mainly at 254 nm is generated by excitation and emission of mercury, A luminous flux is obtained by converting the ultraviolet light into visible light in the phosphor layer. As a type of fluorescent lamp, a straight tube type or a ring type has been generally used, but in addition to this, a light bulb type, a compact type, or the like has become popular in recent years.

On the other hand, HID is a general term for a high-pressure mercury lamp, a metal halide lamp, and a high-pressure sodium lamp. The HID emits visible light and ultraviolet light along with discharge, and an outer tube surrounding the arc tube. It has a structure in which a tube is provided, and there is also a type in which the surface of the outer tube is covered with a phosphor layer.
The phosphor layer of these lamps is formed by applying a dispersion liquid containing a binder in addition to phosphor particles to an arc tube or an outer tube, followed by drying and firing. As this binder,
Calcium borate / barium, a mixture of calcium borate / barium and calcium pyrophosphate, aluminum oxide and the like are used.

[0004]

In such fluorescent lamps and HIDs, it is required that the power consumption is low, the luminous flux is high, and the life is long, as a basic performance. ing. For example, JP-A-11-167 discloses a method for extending the life of a fluorescent lamp.
In the Japanese Patent Publication No. 899, when the conventional soda glass is used, attention is paid to the fact that sodium that is eluted from the glass at the time of manufacturing or lighting the fluorescent lamp reacts with mercury, so that the brightness of the fluorescent lamp is likely to decrease. A technique has been disclosed in which a glass in which alkali is less likely to be eluted than in conventional soda glass is used to suppress a decrease in brightness of a fluorescent lamp.

Further, in order to obtain a high luminous flux with low power consumption in a fluorescent lamp, for example, research has been conducted to further increase the brightness of the phosphor, and the discharge length can be reduced by making the arc tube thin. The development to secure is also done. With such research and development, the performance of fluorescent lamps and HIDs is also increasing. In recent years, however, the demands for these performances are increasing, and in order to meet those demands, further reduction of power consumption and high luminous flux are required. There is a demand for a technology that makes it possible to obtain

[0006] With respect to such a problem, it is considered that the luminous efficiency can be increased by decreasing the ratio of the binder in the phosphor layer and increasing the ratio of the phosphor particles. This is because the binder does not directly contribute to the conversion of ultraviolet light into visible light. However, when the proportion of the binder is reduced, the binding force between the phosphor particles is weakened, so that the phosphor layer is easily deteriorated. Therefore, the luminous flux maintenance factor of the lamp is likely to decrease.

The present invention has been made under such a background, and an object thereof is to improve the luminous efficiency of a lamp having a phosphor layer.

[0008]

In order to achieve the above object, the present invention provides a fluorescent lamp or a HID having a phosphor layer.
In, as a binder composition for binding the phosphor particles,
Gd, Tb, Eu, Nd, Dy, Tl, Sn, Pb, B
It was decided to use a binder containing an oxide of an element selected from i.

[0009] These oxides are luminescent substances that emit light having a wavelength longer than the ultraviolet light (ultraviolet light or visible light) when receiving the ultraviolet light generated by the excitation of mercury. Therefore, according to the above-mentioned fluorescent lamp or high-intensity discharge lamp, the ultraviolet light generated by the discharge is converted into visible light by irradiating the phosphor particles in the phosphor layer with the primary light. In addition to visible light, it is converted into longer wavelength ultraviolet light or visible light by irradiating the luminescent substance contained in the binder of the phosphor layer. The converted ultraviolet light is also converted into visible light by irradiating the phosphor particles.

As described above, since secondary visible light is also emitted through the luminescent substance contained in the binder, the secondary visible light is emitted along with the discharge as compared with the conventional product in which the binder does not contain the luminescent substance. The efficiency with which the generated ultraviolet light is converted into visible light is improved. Further, even if the luminescent material is contained in the binder, the function of binding the phosphor particles is not hindered. The content of the luminescent substance in the binder composition is Tl, S
In the case of an oxide of an element selected from n, Pb and Bi,
It is preferably set within the range of 0.01 wt% to 1 wt%.

In the case of an oxide of an element selected from Gd, Tb, Eu, Nd, and Dy, 0.01 wt% to 1
It is preferable to set within the range of 0 wt%

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a view showing the outer appearance of a compact fluorescent lamp according to an embodiment of the present invention. In this fluorescent lamp, the fluorescent tube 10 has a base 20.
The fluorescent tube 10 is formed of six straight tube-shaped glass tubes (glass bulbs) 11 having an inner surface covered with a fluorescent material layer 12.

In this fluorescent tube 10, the six glass tubes 11 are connected to each other so that adjacent ones are bridge-joined to each other so that one discharge space is formed inside, and the discharge is performed. A rare gas such as argon and mercury are enclosed in the space. Further, in the fluorescent tube 10, electrodes (not shown) are attached to both ends of this discharge space.

A lighting circuit (not shown) for lighting the fluorescent tube 10 is provided in the base 20. Figure 2
FIG. 3 is a cross-sectional view in which the fluorescent tube 10 is sliced. Fluorescent tube 10
Is formed by forming a phosphor layer 12 on the inner surface of a glass tube 11 made of soda glass.

As shown in FIG. 3, the phosphor layer 12 is formed by binding phosphor particles 12a of a three-wavelength band emission type by a binder 12b. The amount of the binder 12b added to the phosphor particles 12a is set in the range of 0.001 to 10 wt%. The binder 12b is made of a mixture of calcium borate / barium and calcium pyrophosphate as a basic material, and a luminescent substance which converts ultraviolet light having a wavelength of 254 nm into longer wavelength ultraviolet light or visible light is dissolved in the basic material. .

The basic material is not limited to the above-mentioned mixture of calcium borate / barium and calcium pyrophosphate. For example, calcium borate / barium or aluminum oxide may be used alone, or a mixture of aluminum oxide and calcium pyrophosphate may be used. It can also be used. Preferred luminescent substances are gadolinium (Gd), terbium (Tb), europium (Eu), neodymium (Nd), dysprosium (Dy), which belong to lanthanoids.
Oxides of elements selected from 3B, 4B, 5
Thallium (Tl), tin (Sn), lead (P
b) and oxides of elements selected from bismuth (Bi).

The content of these luminescent substances in the binder is thallium (Tl), tin (Sn), lead (P).
For b) and bismuth (Bi) oxide, 0.01
It is preferable to set it in the range of wt% to 1 wt%, and gadolinium (Gd), terbium (Tb), europium (Eu), neodymium (Nd), dysprosium (D
For the oxide of y), 0.01 wt% to 10 wt%
It is preferable to set it within the range.

Such a phosphor layer 12 can be manufactured as follows. A binder composition is prepared by mixing the above-mentioned basic material and a luminescent substance, and dissolving and molding the mixture. The phosphor particles and the above binder are dispersed in a solvent containing a binder to prepare a dispersion liquid.

The phosphor layer 12 is formed by applying this dispersion liquid to the inner surface of the glass tube 11 and then drying and firing it. (Function and effect of using the binder composition) FIG.
FIG. 6 is a diagram illustrating a light emitting mechanism of the fluorescent lamp. In the fluorescent lamp of the present embodiment, the main mechanism of generating the luminous flux is the same as that of the conventional fluorescent lamp. That is, when a voltage is applied to the electrode of the fluorescent tube 10 by the lighting circuit, a discharge is generated in the discharge space inside the fluorescent tube 10, and mercury and a rare gas are excited inside the fluorescent tube 10 with the discharge. UV light UV1 (main wavelength 254n
m) occurs. When the generated ultraviolet light UV1 is applied to the phosphor particles 12a, the phosphor particles 12a are excited to emit visible light V1 (wavelength of about 400 nm or more). This visible light V1 becomes the main luminous flux of the fluorescent tube 10.

In the fluorescent lamp of the present embodiment, in addition to the above primary luminous flux, secondary luminous flux (visible light V2 and visible light V3) is also generated as follows. Fluorescent tube 1
The ultraviolet light UV1 generated in 0 passes through the binder 12b of the phosphor layer 12 and is applied to the phosphor particles 12a. However, since the binder 12b contains the above-mentioned luminescent substance, When the luminescent substance is excited by the ultraviolet light UV1, the binder 12b emits near-ultraviolet light UV2 (wavelength is 254n).
visible light V2 is emitted.

Further, part of the near-ultraviolet light UV2 emitted from the binder 12b is applied to the phosphor particles 12a, and the phosphor particles 12a are excited by the near-ultraviolet light UV2 to emit visible light V3. It Thus, in the fluorescent lamp of this embodiment, the primary luminous flux (visible light V1)
Not only that, but also a secondary luminous flux (visible light V2, V3) is generated due to the luminous substance contained in the binder 12b. In addition, the luminescent substance has almost no effect of absorbing visible light. Therefore, the luminous efficiency is improved.

Further, among the phosphor particles existing in the phosphor layer 12, the ultraviolet light UV1 is applied to the surface of the phosphor particles facing the internal space, so that the primary visible light V1 is also mainly fluorescent light. It occurs on the side of the body layer 12 facing the internal space.
On the other hand, near-ultraviolet light UV2 and visible light V2 are
Since it is emitted from the light emitting substance existing in 2b, the secondary visible lights V2 and V3 are generated at a position closer to the external space than the visible light V1.

In that respect, the secondary visible lights V2 and V3 are likely to be emitted to the external space, and it is considered that they contribute largely to the improvement of the luminous efficiency. As will be shown in the experimental results described later, by adding an appropriate amount of a luminescent substance to the binder, a secondary luminous flux (visible light V2) with respect to the total luminous flux (combined visible light V1, V2, V3) , V3)
Can be 2% or more.

Among the oxides of the elements listed above as the luminescent substances, from the viewpoint of improving the luminous efficiency, oxides of the elements belonging to the lanthanoids, particularly gadolinium (Gd) and terbium (Tb), are Promising. The reason is that oxides of these elements have emission spectra suitable for efficiently exciting phosphor particles generally used in fluorescent lamps.

That is, when the phosphor layer 12 is irradiated with ultraviolet light, the conversion efficiency into visible light differs depending on the wavelength of the ultraviolet light to be irradiated. Here, the emission spectrum of the oxides of these elements has a wavelength range of 260 to 400 n, which is excellent in ultraviolet light conversion efficiency with respect to a phosphor for a general phosphor lamp.
A large amount of light is emitted at m. In addition, the emission spectra of oxides of these elements show the sensitivity of the human eye.
High wavelength region of the human eye (550 nm)
The fact that the amount of light emission in the vicinity) is relatively large is also mentioned as a reason for obtaining high light emission efficiency. [Example] [Experiment 1]

[0026]

[Table 1]

No. 1 shown in Table 1 No. 1 is a compact fluorescent lamp according to a comparative example. 2 to 7 are compact fluorescent lamps according to the embodiment. Each of these fluorescent lamps has a total length of 145 mm and a glass tube diameter of 12.5 m.
m, rated power 32W. In the fluorescent lamp according to the example, the glass tube 11 is made of soda glass, and its composition is 68 wt% of SiO _{2 and} 1.5 w of Al ₂ O _3.
t%, Na ₂ O 5 wt%, K ₂ O 7 wt%, MgO 5 wt%, CaO 4.5 wt%, SrO 5 wt%,
BaO is 6 wt% and Li ₂ O is 1 wt%.

The phosphor layer 12 has a color temperature of 5000K.
The three-wavelength light-emitting type phosphor particles are formed by binding with the binder composition. This binder composition is composed of calcium borate / barium (0.3CaO / 0.7BaO /
1.6B ₂ O ₃ ) and calcium pyrophosphate (Ca ₂ P
₂ O ₇ ) in a weight ratio of 60:40 is used as a basic material, and TlO (thallium oxide) is used as a luminescent substance.
Is added so that the content becomes 0.3 wt%.

In each of the examples (Nos. 2 to 7), the amount of the binder composition mixed with 100 g of the phosphor particles is shown in Table 1.
Each value (0.0005g, 0.001g, 0.1
g, 1 g, 10 g, 15 g). On the other hand, in the fluorescent lamp according to the comparative example, except that the phosphor layer is formed using the binder composition containing no TlO,
It has the same structure as the fluorescent lamp of the embodiment.

Then, the initial luminous flux value, luminous flux maintenance factor, and film strength were measured for each of the fluorescent lamps of Examples and Comparative Examples. Measurement method: The initial luminous flux value (100 h, lm) is a value obtained by measuring the luminous flux of the fluorescent lamp when the life test was performed for 100 hours.

For the luminous flux maintenance factor, a life test (a cycle of turning on for 45 minutes and then turning off for 15 minutes is repeated) is 40.
The luminous flux is measured at the time of performing the operation for 00 hours, and the measured value is expressed by the ratio to the initial luminous flux value. The phosphor film strength MPa is as follows for the phosphor layer formed on the glass tube.
High-pressure nitrogen gas was blown from a nozzle (0.5 mmφ) 5 mm away from the nozzle while pressurizing at a constant rate, and the pressure when peeling occurred in the phosphor layer was measured.

Measurement Results and Discussion: Each measurement result is shown in Table 1. No. 1 containing only 0.0005 wt% of the binder. In No. 2, No. 2 containing no binder.
Compared to 1, there is almost no difference in the initial luminous flux value,
No. 1 containing 0.001 wt% or more of a binder. 3-
No. In No. 7, No. 7 The initial luminous flux value is considerably higher than that of 1. In addition, regarding the film strength, no. 3 to No. In No. 7, No. 7 It is considerably higher than 1.

Particularly, the binder is 0.001 wt% to 10 w.
t% included in No. 3 to No. In No. 6, the initial luminous flux value is considerably high, and Compared with 1, the initial luminous flux value is higher by 2% or more. On the other hand, the content of binder exceeds 10 wt% N
o. In No. 7, No. 7 Compared to 3-6, the initial luminous flux is low,
The film strength is also low.

Regarding the luminous flux maintenance factor, no. 1-No.
There is almost no difference between the seven. In addition, in this Experiment 1, as the luminescent substance, Tl was added to the binder composition.
The case of adding 0.3 wt% of O was investigated.
By adding O within the range of 0.01 wt% to 1 wt%, the initial luminous flux value was improved by 2% or more. Also, S
For the oxides of n, Pb and Bi, 0.01 wt%-
By adding it within the range of 1 wt%, the initial luminous flux value is improved by 2% or more, and the oxides of Gd, Tb, Eu, Nd, and Dy should be set within the range of 0.01 wt% to 10 wt%. As a result, the initial luminous flux value was improved by 2% or more. [Experiment 2]

[0035]

[Table 2]

No. 1 shown in Table 2 Sample No. 8 is a compact fluorescent lamp according to a comparative example. Reference numerals 9 and 10 are compact fluorescent lamps according to the embodiment. These fluorescent lamps have the same structure as the above No. 1 except for the binder composition used for the phosphor layer. It has the same specifications as 1 to 7. The basic material of the binder composition is also the above No. Similar to 1 to 7, calcium borate / barium (0.3CaO / 0.7BaO / 1.
6B ₂ O ₃ ) and calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) are mixed at a weight ratio of 60:40.

No. In No. 8, the above basic materials were used as they were as a binder composition. No. In No. 9, a binder composition was prepared by adding Tb ₂ O ₃ (terbium oxide) as a light-emitting substance to the above basic material so that the content thereof was 5 wt%. No. In No. 10, a binder composition was prepared by adding Gd ₂ O ₃ (gadolinium oxide) as a light emitting substance to the above basic material so that the content thereof was 5 wt%.

The amount of the binder composition mixed with 100 g of the phosphor particles was No. All of 8 to 10 were set to 0.5 g. Then, for each of the fluorescent lamps according to the example and the comparative example, the initial luminous flux value, luminous flux maintenance factor, and film strength were measured in the same manner as in Experiment 1. Measurement Results and Discussion: Table 2 shows each measurement result.

Regarding the film strength and the luminous flux maintenance factor, N
o. 8 to No. Although there is almost no difference between No. 10 and No. 10 according to the example. In Nos. 9 and 10, Nos. It can be seen that the initial luminous flux value is higher than that of No. 8 by 2% or more. From Experiments 1 and 2 described above, it is understood that the initial luminous flux can be improved by 2% or more without lowering the luminous luminous flux maintenance by using an appropriate amount of the binder containing the luminous substance.

[Second Embodiment] FIG. 4 is a sectional view of an arc tube of a fluorescent lamp according to the present embodiment. The fluorescent lamp of the present embodiment is similar to the fluorescent lamp of the first embodiment, but a fluorescent tube 40 is used instead of the fluorescent tube 10. In this fluorescent tube 40, a protective layer 43 is interposed between a fluorescent material layer 42 and a glass tube 41.

This protective layer 43 is made of zinc oxide ZnO, titanium oxide TiO ₂ , silicon oxide SiO ₂ , aluminum oxide A.
A transparent layer made of a material containing a metal oxide selected from l ₂ O ₃ as a base material and a luminescent substance dissolved in the base material. Specific examples of the light-emitting substance include the elements (Tl, Sn, Pb, Bi, Gd,
Examples thereof include those selected from oxides of Tb, Eu, Nd, Dy).

The content of the luminescent substance in the protective layer is
It is preferably installed within the range of 0.01 to 30 wt%. Phosphor layer 42 is similar to phosphor layer 12 of the first embodiment. The protective layer 43 can be formed by the following method. A powder material of a light emitting substance is added to a powder material of a metal oxide which is a base material of the protective layer 43, and the powder of a composite oxide is prepared by melting and pulverizing the powder material. Is added to a solvent such as an organic solvent (isopropyl alcohol) and dispersed therein to prepare a coating liquid. And, this coating liquid,
The protective layer 43 can be formed by coating the inner surface of the glass tube 41 with a method such as a spraying method, and drying and baking.

By thus dissolving the light-emitting substance in the base material, the metal oxide (ZnO, TiO 2) of the base material is dissolved.
₂ , SiO ₂ , Al ₂ O ₃ ) and the metal oxide of the light emitting substance form a composite oxide. As a method for coating the mixed powder on the inner surface of the glass tube 41, in addition to the wet method as described above, an electrostatic coating method or a sol-gel method using a solution in which a metal alkoxide is dissolved in an organic solvent is used. Can also be considered.

By providing the protective layer 43 containing the luminescent material as described above, the protective layer 43 is as follows.
It is possible to obtain both the effect of increasing the luminous flux maintenance rate by the base material inside and the effect of improving the luminous efficiency by the light emitting substance. Since the base material in the protective layer 43 does not easily allow sodium diffused from the glass to pass through to the phosphor layer 12, the phosphor layer 12 suppresses mercury from reacting with sodium in the glass and blackening. At the same time, the effect of increasing the luminous flux maintenance factor is obtained by suppressing the deterioration of the phosphor. On the other hand, the luminescent substance has the effect of improving the luminous efficiency.

As described above, in the present embodiment, not only the binder of the phosphor layer but also the protective layer contains the light-emitting substance, so that a luminous flux is generated due to that, and the luminous efficiency is further increased. Is improved. It should be noted that the glass tube 41 does not need to contain the light emitting substance, but if the glass tube 41 also contains the light emitting substance, further improvement in light emission efficiency can be expected.

[Third Embodiment] In the present embodiment, High
The application to an intensity discharge lamp (HID) will be described by taking a fluorescent mercury lamp as an example. FIG. 5 is a diagram showing an example of a fluorescent mercury lamp. This fluorescent mercury lamp is one type of high-pressure mercury lamp, and as shown in the figure, is composed of an arc tube 51, a base 52, an outer tube 53, and the like.

The arc tube 51 is made of transparent quartz glass, has electrodes 54 at both ends, and has mercury and argon gas sealed inside. The outer tube 53 has a phosphor layer 56 on the inner surface of a glass tube 55 provided so as to surround the arc tube 51.
Is formed by being attached. In the arc tube 51, visible light is emitted by discharging in mercury vapor of high pressure (100 to 1000 kPa). In addition to this, ultraviolet light is also emitted in the arc tube 51, and the phosphor layer of the outer tube 53 is emitted. 56 receives this ultraviolet light and excites and radiates visible light.

Here, the phosphor layer 56 is formed by binding the phosphor particles together with the binder composition, as in the phosphor layer 42 described in the first embodiment. And
The binder composition uses a mixture of calcium borate / barium and calcium pyrophosphate as a basic material, and a luminescent substance that converts ultraviolet light having a wavelength of 254 nm into longer wavelength ultraviolet light or visible light is dissolved in the basic material. I'm out.

Specific examples of the luminescent material include the above-mentioned Gd,
Examples thereof include oxides of elements selected from Tb, Eu, Nd, Dy, Tl, Sn, Pb, and Bi. According to the fluorescent mercury lamp of the present embodiment, in the phosphor layer 56, ultraviolet light is converted into visible light not only by the phosphor particles but also by the luminescent substance contained in the binder. It is possible to obtain excellent luminous efficiency as compared with the case where no luminous substance is added.

[0050]

As described above, according to the present invention, in a fluorescent lamp or a HID having a phosphor layer, Gd, Tb, Eu, N is used as a binder composition for binding phosphor particles.
By using a binder containing an oxide of an element selected from d, Dy, Tl, Sn, Pb, and Bi, the efficiency of converting ultraviolet light generated by discharge into visible light is improved. Therefore, the luminous efficiency of the lamp can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a compact fluorescent lamp according to an embodiment.

FIG. 2 is a cross-sectional view in which the fluorescent tube of the fluorescent lamp is sliced.

FIG. 3 is a diagram illustrating a light emitting mechanism of the fluorescent lamp.

FIG. 4 is a sectional view of an arc tube of a fluorescent lamp according to a second embodiment.

FIG. 5 is a diagram showing a fluorescent mercury lamp according to a third embodiment.

[Explanation of symbols]

10 fluorescent tube 11 glass tubes 12 Phosphor layer 12a phosphor particles 12b Binder 55 glass tube 56 phosphor layer

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[Procedure amendment]

[Submission date] January 14, 2003 (2003.1.1
4)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

[0035]

[ Table 2 ]

Claims (8)

[Claims] 1. A binder composition for a lamp used for forming a phosphor layer of a lamp, wherein the element is selected from gadolinium, terbium, europium, neodymium, dysprosium, thallium, tin, lead and bismuth. A binder composition for a lamp, containing the oxide of 1. 2. The binder composition for a lamp contains 0.01 wt% or more and 10 wt% or less of an oxide of an element selected from gadolinium, terbium, europium, neodymium, and dysprosium. The binder composition for a lamp according to claim 1, wherein the binder composition is a lamp. 3. The binder composition for a lamp contains 0.01 wt% or more and 1 wt% or less of an oxide of an element selected from thallium, tin, lead and bismuth. The binder composition for a lamp according to claim 1. 4. A fluorescent lamp comprising a glass tube having an inner surface coated with a phosphor layer, in which mercury and a rare gas are sealed, and an electrode for causing discharge in the fluorescent tube. Is formed by binding phosphor particles with a binder, and the binder contains an oxide of an element selected from gadolinium, terbium, europium, neodymium, dysprosium, thallium, tin, lead, and bismuth. A fluorescent lamp characterized by being contained. 5. The fluorescent lamp according to claim 4, wherein the oxide emits an ultraviolet light having a wavelength longer than the ultraviolet light and a visible light when the oxide receives the ultraviolet light excited by mercury. . 6. A total luminous flux emitted from the fluorescent lamp includes a first luminous flux consisting of visible light emitted by the phosphor particles when the phosphor particles receive ultraviolet light due to excitation of mercury. A second luminous flux composed of visible light emitted by the oxide in the binder upon receiving ultraviolet light due to the excitation of mercury, and an ultraviolet light component emitted by the oxide receiving ultraviolet light due to the excitation of mercury And a third luminous flux of visible light emitted by the phosphor particles is emitted, and the sum of the second luminous flux and the third luminous flux is
The fluorescent lamp according to claim 4, wherein the fluorescent light occupies 2% or more of the total luminous flux. 7. In the phosphor layer, the binder is 0.001 wt% or more and 10 wt% with respect to the phosphor particles.
% Or less is contained, The fluorescent lamp in any one of Claims 4-6 characterized by the above-mentioned. 8. A high-intensity discharge lamp comprising: an arc tube which emits visible light and ultraviolet light in association with discharge, and an outer tube which is provided so as to surround the arc tube and whose surface is covered with a phosphor layer. The phosphor layer is formed by binding phosphor particles with a binder, and the binder is an element selected from gadolinium, terbium, europium, neodymium, dysprosium, thallium, tin, lead, and bismuth. A high-intensity discharge lamp characterized by containing the oxide of.