KR20040101012A - Luminescent composition, and fluorescent lamp and fluorescence material coating liquid for the same - Google Patents

Abstract

It is possible to improve the total luminous flux of a fluorescent lamp, to provide a light emitting composition capable of improving the tube monochromatic difference and the luminous flux retention, and to reduce manufacturing costs, and a phosphor coating liquid for a fluorescent lamp.

A carbonate compound is added to and mixed with a phosphor coating liquid containing an ultraviolet excitation phosphor or a binder for dispersing in an ultraviolet excitation phosphor or a binder solution to form a light emitting composition or a phosphor coating liquid for a lamp, and the fluorescent film is used. To form a fluorescent lamp.

Description

LUMINESCENT COMPOSITION, AND FLUORESCENT LAMP AND FLUORESCENCE MATERIAL COATING LIQUID FOR THE SAME}

The present invention relates to a luminescent composition for ultraviolet excitation and a fluorescent lamp for using the luminescent composition as a fluorescent film and a phosphor coating liquid for a fluorescent lamp.

As a fluorescent lamp for general lighting, in addition to the conventional white light-emitting fluorescent lamp which uses a halophosphate type fluorescent substance as a fluorescent film, what is called a three-wavelength luminescent fluorescent lamp is put to practical use, and satisfies high efficiency and high color rendering simultaneously, It is becoming the mainstream of fluorescent lamps for general lighting. The three-wavelength luminescent fluorescent lamp is a mixture of three phosphors of blue luminescence (B), green luminescence (G) and red luminescence (R) having a relatively narrow band emission spectrum distribution at an arbitrary ratio. The film | membrane (fluorophor layer) which consists of mixed fluorescent substance is formed in the inner wall surface of the glass tube which is the outer envelope of fluorescent lamp.

Such fluorescent lamps are ultraviolet rays generated by the discharge of mercury vapor enclosed in the lamp tube, and are mercury vapor fluorescent lamps that excite and emit a fluorescent film formed on the inner wall of the lamp tube, that is, a conventional type of hot cathode fluorescent lamp or liquid crystal. In addition to a cold cathode fluorescent lamp used for a backlight for a lamp, the fluorescent film is excited with a vacuum ultraviolet ray having a wavelength of 200 nm or less, which is generated by the discharge of a rare gas such as argon or xenon enclosed in a tube of the lamp, mainly a light source for an OA device. Light-emitting types and the like. In recent years, these fluorescent lamps are not limited to general lighting, but are also used in light sources for OA devices, backlights of liquid crystal displays, and the like, and their fields of use are expanding.

By the way, the fluorescent film of the conventional three-wavelength luminescent fluorescent lamp or a rare gas lamp, the fluorescent substance coating liquid (also called fluorescent substance slurry) which consists of mixed fluorescent substance of three kinds of phosphors, B, G, and R, is attached to the inner wall of the glass tube for lamps. It is applied by a method such as bleeding, and dried to form it. The sedimentation behavior of the phosphor slurry depends on the specific gravity, particle diameter, particle diameter distribution and particle shape of each phosphor of B, G, and R used. In accordance with the difference, when the phosphor slurry is applied, the distribution state of each phosphor of B, G, and R in the coating film varies between both ends of the phosphor lamp. For this reason, there is a disadvantage that the light emission color is different (a tube monochromatic difference occurs) in both tube ends of the fluorescent lamp.

In addition, conventional three-wavelength emission type fluorescent lamps and rare gas lamps have a decrease in luminous flux retention during continuous lighting, and their lifespan is not necessarily sufficient, which hinders their expansion.

In recent years, there has been an urgent need for a three-wavelength luminescent fluorescent lamp having better characteristics and cheaper in the market.

In order to reduce the manufacturing cost of this lamp, various studies have been made in the past, and for example, the luminous flux of the lamp is reduced by using a light emitting composition in which calcium pyrophosphate or the like is mixed with a phosphor as the fluorescent film of the fluorescent lamp. It is proposed to only reduce the%, reduce the amount of the phosphor itself and reduce the production cost (see Patent Document 1, for example).

[Patent Document 1]

Japanese Patent Publication No. 2-43303

However, in a fluorescent lamp using a luminescent composition composed of a mixture of these non-luminescent materials and a phosphor as a fluorescent film, it was extremely difficult to reduce the manufacturing cost and to improve the total luminous flux.

SUMMARY OF THE INVENTION The present invention has been made to address the above-mentioned problems, and particularly when a fluorescent lamp is used, the total luminous flux can be improved, the tube monochromatic difference and the luminous flux maintenance rate can be improved, and the manufacturing cost can be reduced. It is an object to provide a light emitting composition, a fluorescent lamp, and a phosphor coating liquid for a fluorescent lamp.

(Means to solve the task)

MEANS TO SOLVE THE PROBLEM This inventor repeatedly examined the surface treatment of fluorescent substance in order to achieve the improvement of the luminous flux retention of fluorescent lamp, and proposed previously that it is effective to coat a specific carbonate compound on the surface of fluorescent substance (refer Japanese patent application 2001-388507). ). However, in this method, since the surface of the phosphor is covered with a specific carbonate compound which is a non-luminescent component, when the adhesion amount exceeds approximately 5% by weight relative to the phosphor, the luminance is lowered, and there is a limitation in the application range. However, since carbonate compounds are generally sufficiently inexpensive materials compared with phosphors, if the amount of phosphors used can be relatively reduced by increasing the amount of the carbonate compound by a method other than coating the surface of the phosphors, The manufacturing cost of the fluorescent lamp can be reduced without degrading the characteristics of the fluorescent lamp.

Therefore, in order to achieve the above object, the present inventor has earnestly studied with the above considerations in mind, and therefore, a phosphor capable of emitting light under ultraviolet excitation such as a phosphor for a three-wavelength fluorescent lamp (a phosphor for ultraviolet excitation) Or the present invention was found that the above object can be achieved by adding a specific carbonate compound to the slurry as an additive material, preparing a light-emitting composition obtained by mixing and using this as a fluorescent film.

This invention consists of the following structures.

(1) A luminescent composition comprising a mixture of an ultraviolet excitation phosphor and a carbonate compound.

(2) The light emitting composition according to the above (1), wherein the carbonate compound is an alkaline earth metal carbonate and / or a rare earth metal carbonate.

(3) Content of the said carbonate compound is 0.005-240 weight% with respect to the weight of the said ultraviolet excitation fluorescent substance, The light emitting composition as described in said (1) or (2) characterized by the above-mentioned.

(4) A fluorescent lamp formed by forming a fluorescent film on an inner wall of a glass tube, wherein the fluorescent film is made of the light emitting composition according to any one of (1) to (3).

(5) The fluorescent lamp according to the above (4), wherein the amount of carbon contained in the fluorescent film is 150 ppm to 5%.

(6) A phosphor coating liquid for fluorescent lamps in which at least an ultraviolet excitation phosphor and a binder are dispersed in a water-soluble binder or an organic binder, wherein the phosphor coating liquid contains a carbonate compound in the phosphor coating liquid. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a graph which shows the relationship between the superlight flux of the fluorescent lamp of this invention, and the addition ratio of the carbonate compound in the luminescent composition used as a fluorescent film of the lamp.

2 is a graph showing the relationship between the amount of carbon contained in the fluorescent film of the fluorescent lamp of the present invention and the addition ratio of the carbonate compound added to the light emitting composition used for forming the fluorescent film of the lamp.

The luminescent composition (first invention of the present invention) of the present invention adds a predetermined amount of an additive material made of a specific carbonate compound to a UV-excitation phosphor that emits light under ultraviolet excitation such as a phosphor for a three-wavelength fluorescent lamp and mixes it sufficiently mechanically. It can be obtained by.

The carbonate compound used in the present invention is not particularly limited as long as it is a metal carbonate compound. However, the higher the pyrolysis temperature (the temperature which completely decarbonates), the better, and preferably, the pyrolysis temperature is about 600 ° C. or higher. When a carbonate compound with a low pyrolysis temperature is used, it decarboxylates in the heat processing process in the manufacturing process of a fluorescent lamp, and it does not exist as a carbonate already, and it does not show the function as the luminescent composition of this invention. It is more preferable that pyrolysis temperature is 800 degreeC or more among the carbonate compounds used in this invention. However, these depend on each manufacturing condition and lamp | ramp type at the time of manufacturing a lamp using the light emitting composition of this invention. For example, some may not have sufficient heat treatment near 500 ° C, such as a straight tube lamp, and some may have a high temperature of 800 ° C or higher in a bending process, such as a round tube lamp. It is necessary to select a carbonate compound having characteristics.

Preferred carbonates for the light emitting composition of the present invention having a relatively high pyrolysis temperature include alkaline earth carbonates and rare earth carbonates. Alkaline earth carbonates such as calcium carbonate, strontium carbonate, barium carbonate, etc., according to the well-known Merck index issued by the US Merck company, the decomposition temperature is described as 825 ° C, 1100 ° C and 1300 ° C, respectively. Is quite high. These carbonate compounds used in the present invention may be a single compound or a mixture of various carbonate compounds, and may contain crystal water, double earth salts having alkaline earth metals, rare earth metals, and carbonate radicals as main components. The compound which forms the form may be sufficient.

The preferable addition amount of the carbonate compound added to the fluorescent substance for ultraviolet excitation in the light emitting composition of this invention changes with a desired effect. That is, when pursuing the improvement of the luminous flux retention when using a fluorescent lamp, it is preferable to set it as about 0.005 to 50 weight% with respect to the used fluorescent substance total weight, and it is more preferable to set it as 0.01 to 45 weight%. Moreover, when it is desired to improve the total luminous flux when using a fluorescent lamp, it is preferable to set it as about 0.01-50 weight% with respect to the total fluorescent substance used, and it is more preferable to set it as the range of 0.01-30 weight%. Do. However, if the amount of the carbonate compound to be added is less than about 0.005% by weight relative to the total amount of the fluorescent substance, the effect of preventing the decrease of the luminescence brightness over time when the fluorescent lamp is used cannot be obtained. If the ratio of the non-luminescent component to the phosphor is increased, the luminous efficiency of the fluorescent film is lowered and the total luminous flux of the fluorescent lamp is lowered.

Moreover, when the manufacturing cost of a fluorescent lamp is suppressed and the main thing of reducing a tube monochromatic difference is the main thing, it is preferable to set it as about O-OO5-240 weight% with respect to the used fluorescent substance total weight, and it is 5-100 weight% It is more preferable to set it as the range of. In this case, if the amount of the added carbonate compound is less than about 0.005% by weight relative to the total amount of the fluorescent substance, the effect of improving the total luminous flux when the fluorescent lamp is used is not seen. If it cannot obtain, and in contrast, it is more than 240 weight%, since the fall of the luminous luminance of a light emitting composition is remarkable and the fall of the total luminous flux in the case of using a fluorescent lamp becomes large, it is not practically preferable.

Further, as the ultraviolet ray-excited phosphor that is used in the present invention, for example, (Sr, Ca, Ba, Mg) 5 (PO 4) 3 Cl: Eu, (Ba, Ca, Sr) (Mg, Zn) Al 10 O ₁₇ : Eu, (Ba, Ca, Sr) (Mg, Zn) Al ₁₀ O ₁₇ : Eu, Mn, BaMgAl ₁₀ O ₁₇ : Eu, BaMgAl ₁₀ O ₁₇ : Eu, Mn, Sr ₅ (PO ₄ ) ₃ Cl _{: Eu, LaPO 4: Ce,} Tb, MgAl 11 O 19: Ce, Tb, Y 2 O 3: Eu, YV0 4: Eu, Y (P, V) O 4: Eu, 3.5MgO · 0.5MgF 2 · GeO ₂ : Mn, Ca ₁₀ (PO ₄ ) ₆ FCl: Sb, Mn, Sr ₁₀ (PO ₄ ) ₆ FCl: Sb, Mn, (Sr, Mg) ₂ P ₂ O ₇ : Eu, Sr ₂ P ₂ 0 ₇ : Eu, CaWO ₄ , CaW0 ₄ : Pb, MgWO ₄ , (Ba, Ca) ₅ (PO ₄ ) ₃ Cl: Eu, Sr ₄ Al ₁₄ O ₂₅ : Eu, Zn ₂ SiO ₄ : Mn, BaSi ₂ 0 ₅ : Pb , SrB ₄ O ₇ : Eu, (Ca, Zn) ₃ (PO ₄ ) ₂ : Tl, LaPO ₄ : Ce, (Y, Gd) BO ₃ : Eu, (Y, Gd) ₂ 0 ₃ : Eu and the like UV-excitation phosphors or vacuum ultraviolet-rays that emit light with high efficiency when excited by ultraviolet rays having a wavelength greater than 200 nm or vacuum ultraviolet rays having a wavelength of 200 nm or less, which are used in ordinary fluorescent lamps, cold cathode lamps, rare gas lamps, and PDPs used in mercury. Here There is no restriction | limiting in particular if it is a fluorescent substance.

In order to obtain the light emitting composition of the present invention, a predetermined amount of ultraviolet excitation phosphor and a carbonate compound are mixed with a container rotary mixer such as, for example, a V-type mixer, or the mixture is sufficiently mixed by passing through a sieving several times to obtain a powdery light emitting composition. Although it can obtain, for example, a predetermined amount of ultraviolet-excitation phosphor and carbonate compound may be added to a liquid such as a solution in which a binder is dissolved, and mixed in a liquid to form a slurry.

The fluorescent lamp (2nd invention of this invention) of this invention is manufactured similarly to the conventional fluorescent lamp except using the light emitting composition of the said invention as the fluorescent film. That is, to the water-soluble binder solution, such as polyethylene oxide, or the organic binder solution, such as nitrocellulose, the luminescent composition and binder of this invention are added in predetermined ratio, it is made to slurry by sufficient dispersion mixing, and the fluorescent substance coating liquid is prepared, It is manufactured by the conventional manufacturing method generally known except apply | coating this fluorescent substance coating liquid to the inner wall of the glass tube for lamps. The glass tube for lamps to which this fluorescent substance coating liquid is apply | coated may be previously equipped with the protective film etc. in the inner wall surface, and is not specifically limited.

In the fluorescent lamp of the present invention manufactured as described above, since the carbonate compound is used as one of the constituent components as the fluorescent film, the fluorescent film peeled from the fluorescent lamp produced through the baking process is more than the conventional fluorescent lamp. One of the features is that it contains a lot of about 150 ppm to 5% of carbon.

Moreover, the fluorescent substance coating liquid (third invention of this invention) of the fluorescent lamp of this invention is a fluorescent substance for ultraviolet excitation and the luminescent composition of the said invention at least in water-soluble binder solution, such as polyethylene oxide, or organic binder solution, such as nitrocellulose. It can obtain by disperse | distributing the carbonate compound and binder used as a structural component in a predetermined ratio, and mixing sufficiently. In addition, the coating liquid for fluorescent lamps of this invention is not prepared previously, but adds predetermined amount of carbonate compounds to the conventional fluorescent substance coating liquid prepared separately just before apply | coating to the inner wall of the glass tube of a fluorescent lamp, and is fully It goes without saying that it may disperse | distribute and provide for formation of the fluorescent film of a fluorescent lamp.

In Fig. 1, FL40S white fluorescent lamps each having a fluorescent film using a mixed phosphor for ultraviolet excitation used in Example 1 below and a light emitting composition using different amounts of barium carbonate as the carbonate compound, respectively, were prepared and used as the fluorescent film. The result of having measured the relationship between the addition ratio (weight%) of barium carbonate in it and the superluminous flux of the lamp is shown. In FIG. 1, the superlative flux is the luminous flux after lighting for 100 hours. The vertical axis represents the relative value of the conventional fluorescent lamp in which the barium carbonate is not included in the light emitting composition used as the fluorescent film. As can be seen from FIG. 1, the luminous flux is improved up to approximately 50% of the added amount of barium carbonate in the light emitting composition. In addition, although not shown, also when carbonate compounds other than barium carbonate are used as a carbonate compound, it is shown in FIG. 1 between the addition amount of the carbonate compound in a luminescent composition, and the ultra-light flux of the fluorescent lamp which used this luminescent composition as a fluorescent film. A correlation similar to that shown was confirmed.

Thus, the luminous flux of the fluorescent lamp using the light emitting composition of this invention improves because it is because the added carbonate compound suppresses that the mercury in a mercury vapor fluorescent lamp adheres to fluorescent substance. The effect of inhibiting the adhesion of mercury to the phosphor in the fluorescent film is exhibited at the initial stage of manufacturing the fluorescent lamp, and the total luminous flux of the fluorescent lamp is improved by several% due to the addition amount of the carbonate compound in the light emitting composition.

Fig. 2 shows a correlation between the amount of carbon contained in the fluorescent film formed on the inner wall of the glass tube of the fluorescent lamp of the present invention and the amount of the carbonate compound added to the carbonate compound in the luminescent composition used for producing the fluorescent film. Thus, since the fluorescent lamp of this invention contains a carbonate compound, the content of carbon in the film | membrane of a fluorescent lamp becomes large compared with a normal fluorescent lamp.

EXAMPLE

Hereinafter, an Example demonstrates this invention.

Example 1

28 parts by weight of (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu phosphor (BAM), 37 parts by weight of LaPO ₄ : Ce, Tb phosphor (LAP) and 35 parts by weight of Y ₂ 0 ₃ : Eu phosphor (YOX) To the mixed phosphor for ultraviolet excitation, barium carbonate in an amount of 5% by weight relative to the total weight of the mixed phosphor was added and thoroughly mixed, and the light-emitting composition of Example 1 was prepared by passing through a tube.

Next, a 40 W straight fluorescent lamp was produced according to a conventional method except that the phosphor coating liquid composed of the light emitting composition of Example 1 was used. That is, the luminescent composition of Example 1 was well dispersed in a mixed solvent of nitrocellulose butyl acetate to prepare a phosphor coating liquid, and the coating liquid was applied to the inner wall surface of the glass tube for FL40S tube and dried, followed by a conventional method. The fluorescent lamp of Example 1 which was a 40 W linear fluorescent lamp was produced.

The fluorescent lamp produced in Example 1 was cut out, the fluorescent film formed on the inner wall of the glass tube of the fluorescent lamp was peeled off, and the carbon content in the fluorescent film by the carbon-sulfur analyzer EMIA-820 (manufactured by Horiba Sesakuso). Was measured, and the amount of carbon was 0.31%.

EXAMPLES 2-5

The luminescent composition of Example 1 except that barium carbonate was added in an amount of 11 wt%, 43 wt%, 100 wt%, and 233 wt%, respectively, instead of 5 wt%, based on the total amount of the mixed ultraviolet fluorescent excitation phosphor of Example 1; In the same manner, the light emitting compositions of Examples 2, 3, 4, and 5 were prepared.

Next, except for using the light emitting composition of Examples 2-5 instead of the light emitting composition of Example 1 as a light emitting composition, it carried out similarly to the fluorescent lamp of Example 1, and manufactured the fluorescent lamps of Examples 2-5.

In the same manner as in Example 1, the carbon amounts of the fluorescent lamps of Examples 2, 3, 4, and 5 were measured, and were 0.58%, 1.7%, 3.0%, and 4.1%, respectively.

Example 6

Example 6 was carried out in the same manner as in the light-emitting composition of Example 1, except that 5% by weight of calcium carbonate was added to the mixed phosphors instead of the 5% by weight of barium carbonate mixed in the ultraviolet-excitation mixed phosphors. The light emitting composition of was prepared.

Next, the fluorescent lamp of Example 6 was manufactured similarly to the fluorescent lamp of Example 1 except having used the luminescent composition of Example 6 as a light emitting composition instead of the luminescent composition of Example 1.

Example 7

5 wt% of yttrium carbonate was dispersed well in a mixed solvent of nitrocellulose butyl acetate based on the total amount of the mixed fluorescent substance for ultraviolet excitation and the mixed fluorescent substance used in Example 1 to prepare the phosphor coating liquid of Example 7, and the phosphor coating The fluorescent lamp of Example 7 was manufactured similarly to the fluorescent lamp of Example 1 using the liquid.

Example 8

A phosphor coating liquid of Example 8 was prepared in the same manner as in the phosphor coating liquid of Example 7 except that 5 wt% of lanthanum carbonate was used instead of 5 wt% of yttrium carbonate, and the phosphor coating liquid was used as an example. In the same manner as in the fluorescent lamp of 1, the fluorescent lamp of Example 8 was manufactured.

Comparative Example 1

A mixed phosphor for ultraviolet excitation consisting of a mixture of 28 parts by weight of a BAM phosphor, 37 parts by weight of a LAP phosphor, and 35 parts by weight of a Y ₂ O ₃ : Eu phosphor (YOX) used in the preparation of the light emitting composition of Example 1 was mixed It was called a phosphor.

In addition, the fluorescent lamp of Comparative Example 1 was manufactured in the same manner as in the fluorescent lamp of Example 1, except that the mixed phosphor of Comparative Example 1 was used instead of the light emitting composition of Example 1.

It was 85 ppm when the carbon amount of the fluorescent lamp of Comparative Example 1 was measured similarly to Example 1.

The fluorescent lamps of Examples 1 to 8 and Comparative Example 1 described above were turned on continuously for a predetermined time, and the superluminous flux, luminous flux retention rate, and tube monochromatic difference of each lamp at that time were measured, respectively, and the result was measured by the fluorescent lamp. It shows in Table 1 with the kind of carbonate added to each luminescent composition used as the fluorescent film of this, and its addition amount. In addition, in Table 1, the addition amount of carbonate shows the amount (weight%) of the carbonate compound with respect to the mixed phosphor total amount in the luminescent composition used about Examples 1-6, and fluorescent substance application about Example 7 and 8. It is the addition amount (weight%) with respect to the total amount of the mixed fluorescent substance in the coating composition of the carbonate compound added in the composition.

In Table 1, the super luminous flux is a value expressed by the relative luminous flux value of the fluorescent lamp of the fluorescent lamp of Comparative Example 1 measured under the same conditions as the luminous flux of each fluorescent lamp after 100 hours of lighting. It is the value which showed the luminous flux 500 hours after turning on when each lamp lighted continuously as a percentage with respect to the luminous flux just after lighting of each fluorescent lamp. And the tube monochromatic difference (DELTA) A of each fluorescent lamp is (A1) and (x2, y2), when the emission chromaticity of light emission in the part of 10 cm from each both ends of each fluorescent lamp is (x1, y1) and (x2, y2), respectively. ((x1-x2) ² + (y1-y2) ² } ^1/2 .

As can be seen from Table 1, the fluorescent lamps of the present invention (Examples 1 to 6) using the light emitting composition of the present invention as the fluorescent film only have the same fluorescent substance as the phosphor for ultraviolet excitation which is a constituent of the light emitting composition of the present invention. Compared with the conventional fluorescent lamp (Comparative Example 1), the superluminous flux is greatly improved or the degree of deterioration is small, and the luminous flux retention is more than that of the fluorescent lamp of Comparative Example 1, and the tube monochromatic difference of the lamp is Comparative Example 1 Smaller than conventional fluorescent lamps. In addition, instead of using the light emitting composition of the present invention as a fluorescent film, the phosphor coating liquid of the present invention (Examples 7 and 8) formed by adding a carbonate compound to a phosphor slurry containing an ultraviolet-excitation phosphor, a binder, and a binder is prepared. Even if it uses, compared with the case where the conventional fluorescent substance coating liquid is used, especially super light beam improves more and tube monochromatic difference becomes small.

The present invention is configured as described above, and the fluorescent lamp of the present invention having a fluorescent film produced using the luminescent composition or the phosphor coating liquid of the present invention has a small tube monochromatic difference, high luminous flux, and high luminous flux maintenance rate due to continuous lighting. Can reduce the savings. In addition, since the super luminous flux is improved, the fluorescent film for obtaining the same luminous intensity can be made thin, and the luminous luminance is not reduced due to the addition of additives, so that the amount of the fluorescent material used can be doubled, thereby reducing the amount of fluorescent lamps. The manufacturing cost can be reduced.

Claims (6)

A light emitting composition comprising a mixture of an ultraviolet excitation phosphor and a carbonate compound. The luminescent composition according to claim 1, wherein the carbonate compound is an alkaline earth metal carbonate and / or a rare earth metal carbonate. The light emitting composition according to claim 1 or 2, wherein the content of the carbonate compound is from 0.OO5 to 240% by weight based on the weight of the ultraviolet-excitation phosphor. A fluorescent lamp formed by forming a fluorescent film on an inner wall of a glass tube, wherein the fluorescent film is made of the luminescent composition according to any one of claims 1 to 3. The fluorescent lamp according to claim 4, wherein the amount of carbon contained in the fluorescent film is 150 ppm to 5%. The fluorescent substance coating liquid for fluorescent lamps which disperse | distributed at least the ultraviolet-ray excitation fluorescent substance and the binder in a water-soluble binder or an organic binder WHEREIN: The fluorescent substance coating liquid for fluorescent lamps characterized by containing a carbonate compound in this fluorescent substance coating liquid.