JPH012247A - fluorescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a fluorescent lamp, in particular, which does not have an electrode inside the bulb, and uses a high-frequency electromagnetic field from the outside to remove rare gases, metal vapor, etc. inside the lamp. The present invention relates to technology for preventing luminous flux fading (blackening) in so-called electrodeless fluorescent lamps that discharge gases.

[Background technology]

So-called electrodeless fluorescent lamps, which do not have electrodes inside the bulb and discharge gases such as rare gases and metal vapors inside the lamp using a high-frequency electromagnetic field from the outside, have the characteristics of small size, high output, and long life. As such, research and development are actively being carried out to find applications in light sources for reading originals in optical devices such as electronic copying machines and facsimile machines.

Such an electrodeless fluorescent lamp is usually constructed by filling a bulb with a rare gas and a source, +-, which is desired to emit light.

Ar is generally used as the rare gas sealed in the bulb, and water IN (I+g) is used as the element in the negative shell.

A high-frequency magnetic field is applied from outside the bulb to discharge the enclosed gases such as rare gases and elements.The discharge spectrum of gases is normally biased toward the ultraviolet region, so the inside of the bulb is Forming a phosphor layer and reflective film on the wall surface,
The IIjj converts ultraviolet rays into visible light, which is extracted as light.

Fluorescent lamps such as those described above have a problem of so-called luminous flux degradation, in which the inner wall surface of the bulb turns black with use and the luminous efficiency of the lamp decreases. Luminous flux attenuation is mainly caused by trace amounts of alkali metals (Na, K, Li, etc.) contained in the glass that makes up the bulb reacting with elements such as Hg during discharge operation, resulting in blackening on the inner wall of the bulb. It occurs due to adhesion.

In normal fluorescent lamps, in order to prevent such luminous flux attenuation, ^l, 01, Sing,
Alkali elution prevention treatment has been carried out by applying a sol such as TlO2. However, although such alkali elution prevention treatment is effective (with limitations) for ordinary fluorescent lamps with built-in electrodes, it is not an effective means for preventing luminous flux reduction in the electrodeless fluorescent lamps mentioned above. I don't get it. It is thought that the dirt is caused by the fact that the pores for preventing alkali elution are not dense and non-uniform, and alkali gas is extracted from thin and weak parts of the membrane.

In addition, since the alkali metals mentioned above are also present in small amounts in the phosphor layer and reflective film formed inside the alkali elution prevention film, the alkali elution from the bulb is completely prevented by the alkali elution prevention film. However, it is not possible to prevent the formation of melanized substances from these inner layers.

In addition to the above-mentioned melanides, manganese (Mn) in the phosphor
) is also oxidized, causing blackening, which causes a decrease in luminous flux.

In other words, in conventional fluorescent lamps, the phosphor layer is formed by dispersing the phosphor in water or the like and applying it inside the bulb, then baking it at a temperature of around 600°C. Manganese is oxidized to become black Mn0t. Also,
Oxygen in small amounts of air and moisture contained in sealed gases is
The manganese in the phosphor is activated by the discharge during use and the ultraviolet rays generated thereby, and oxidizes the manganese in the phosphor.
This generates black Mn0z.

(Object of the invention) This invention was made in view of the above circumstances, and
The object of the present invention is to provide a fluorescent lamp having an excellent effect of preventing luminous flux from fading.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides a fluorescent lamp which converts ultraviolet rays generated by discharging gases sealed in a bulb into visible light using a phosphor layer provided on the inner wall surface of the bulb and extracts the visible light. In the lamp, the phosphor layer is characterized in that the phosphor particles are dispersed in a dielectric film formed by applying and baking an organic total reflux compound solution containing phosphor particles. The main focus is on fluorescent lamps.

The present invention will be explained in detail below.

The valves are made of the same materials as before.

That is, if the lamp is a normal fluorescent lamp,
Soda glass, lead glass, etc. are used as bulbs.
When the lamp is an electrodeless fluorescent lamp, quartz glass or hardened silicate glass (so-called Pyrex glass) is used to withstand high temperatures (200 to 300° C.) during operation. Additionally, if the lamp emits light of a specific wavelength, special glass is used accordingly.

The shape of the bulb can also be made into a straight pipe shape, an annular shape, a short arc shape, etc. according to the purpose of use, as in the conventional case.

As shown in FIG. 1, the phosphor layer 2 formed on the inner wall surface of the bulb l is composed of phosphor particles 2a... dispersed in a dielectric film 2b.

As the phosphor constituting the phosphor particles 2a, Ca1@(
1'04) 4FCI:Sh:Mn% 3Caz(PO
4) zcaFz:Sb:Mn, 3Cax(POa)zc
aclt:Sb:Mn 5ZnzSi04:Mn, (
ZnBe)zsi04:Mn,6Mg0:^5zOa
: Usual ones consisting of Mn etc. can be used.

The type of dielectric material constituting the dielectric film 2b in which these phosphor particles 2a are dispersed is not particularly limited in the present invention, but it must be one that transmits ultraviolet rays for causing the phosphor particles 2a to emit light. Therefore, the type of dielectric material is selected depending on the wavelength of ultraviolet rays emitted by the filled gases, the light emission characteristics of the dispersed phosphor particles 2a, and the like.

For example, the filled gas is Ar, which is usually used, and 11g.
If the combination of
Metal oxides such as AItos, Sing, and La1es, which do not absorb nanometer ultraviolet rays, may be used as the dielectric material.

The phosphor layer as described above is placed on the inner wall surface of the cleaned bulb.
It is formed by applying a coating solution containing an alcohol diluted solution of an organometallic compound that will become a dielectric film, in which the phosphor particles are dispersed, and firing.

The dielectrics mentioned above are 8Lx's 5SiOx and Lat
ex, the organometallic compound is Si (O
Czlls) 4, Sj (Of-Cxllt) 4.5
i(OC411+-)4,8I(Oi-C,11,
),, AI (OCglls) z, La (OA-Cs
Metal alkoxides such as llt)4 are preferably used.

For applying the coating solution to the inner wall surface of the valve (cloth), normal painting methods such as dipping the valve in the coating solution or pouring Coating/8/& into the valve are used.

The components other than the diluted alcohol solution of the organometallic compound contained in the coating solution °ζ is IIcI which is a catalyst.
Inorganic acids such as H, SO, CIl, COO
11,11cOOI+, (C1lICo)20,
Examples include organic acids such as ClIC1(, Cl12C(1011), NHzCIIO, etc., and water for hydrolysis.

For dispersing the phosphor particles, a conventional device such as a disper or a ball mill is used, but the device and method are not particularly limited as long as uniform and sufficient dispersibility can be obtained.

Firing conditions are not particularly limited in the present invention, but the organometallic compound described above decomposes (oxidizes) and is heated for 60 minutes or more at a temperature of about 470°C or higher, which is the lower limit temperature at which it becomes the dielectric substance described above. It is desirable to carry out sufficient firing so that carbon (0), hydrogen (11), hydroxyl groups (-OH), etc., do not remain. This is because if carbon in the alkoxide remains in the dielectric, the image becomes black, and oxygen in the hydroxyl group reacts with manganese (Mn) in the phosphor layer formed on top of this to form black MngOs. This is because it reduces the light transmittance.

In this invention, a part of the above firing is performed by IIP, H
It is preferable to carry out the reaction in a hydrogen halide such as CI. This is because, in the presence of hydrogen halides, -011 of M-011, the hydrolyzed form of the organometallic compound,
is replaced with a halogen because the amount of water removed during firing is small and a denser film can be formed.

The fluorescent lamp of the present invention is completed by filling the bulb with the phosphor layer formed as described above with a gas for discharging.

The gases to be sealed are lle, Ne, as before.
, Ars Kr, Xe, Rn, etc., or a mixture of these rare gases with an element for emitting light at a specific wavelength is used.

The element C for emitting light at a specific wavelength is not limited to these, but examples include the following elements.

As< Bis Brs Cds Ilg, P,
Pb, S, Sb, Se, Sn, Te5TIS
Zn et al.

Among these elements, those that can be easily vaporized or are gaseous from the beginning may be encapsulated as they are, while elements that are difficult to vaporize may be encapsulated in the form of iodide, chloride, amalgam, etc.

The filling i11 of gases such as rare gases and elements is not particularly limited in the present invention, and it is sufficient to fill in an amount of gas depending on the type of fluorescent lamp to be formed. For example, when the fluorescent lamp is an electrodeless fluorescent lamp, the amount of the element enclosed may be adjusted so that the pressure of the element is optimal at the operating temperature (200 to 300° C.).

Next, examples of the present invention will be described together with comparative examples.

(Example 1) In the coating solution ^1.03 consisting of the following formulation,
3Ca(PO4)zcaFz:Sb:Mn as a phosphor
and 5Mg0:AszO's were dispersed in a ball mill, and a pre-cleaned Pyrex glass, diameter 1 (i@, No. 1 size 300
A Hatamaro bulb was immersed and pulled out of the solution at a pulling speed of 300 m5/min to form a refill.

<A1201 Coating solution formulation> 81 (OC, l
I*), : 2 2.9 g Butanol: 7
3.4 g Hydrochloric acid 70.4 g Water: 3.3 g After removing the coating film formed on the outside of the bulb,
C. for 5 minutes and 600.degree. C. for 60 minutes in the air to form a phosphor layer on the inner wall surface of the bulb. Thereafter, meter gas and Hg were sealed in this bulb to form an electrodeless fluorescent lamp.

When the obtained electrodeless fluorescent lamp was continuously lit at high frequency for 100 hours and the luminous efficiency was measured, only a decrease of 10% or less was observed.

(Example 2) The firing conditions were as follows: After firing in IIF atmosphere at 230"C x 60, firing in the atmosphere at 600"C for 120 minutes.
An electrodeless fluorescent lamp was produced in the same manner as in Example 1.

When the luminous efficiency of the i4j electrodeless fluorescent lamp was measured after being continuously lit for 100 hours, a decrease of less than 8% was observed.

(Example 3) Ca+a (PO4) aFcl:Sb:Mn as a phosphor was dispersed in a Si0g coating solution having the following composition using a ball mill, and a pre-cleaned quartz glass, diameter 12 dragon, length It was poured into the bulb of a 150-inch fin to form a coating film.

<SiO
sllyL: 22.81! Ethanolonia 3.6g 6porta: 0. 2 g Water: 3.4 g The resulting coating film was heated at 120°C for 20 minutes and at 650°C at 120°C.
The bulb was fired for 1 minute in the air to form a phosphor layer on the inner wall surface of the bulb. Thereafter, ^r gas and 11 g were sealed in this bulb to form an electrodeless fluorescent lamp.

When the obtained electrodeless fluorescent lamp was continuously lit at high frequency for 100 hours and the luminous efficiency was measured, only a decrease of 10% or less was observed.

(Example 4) An electrodeless fluorescent lamp was produced in the same manner as in Example 3 except that the firing conditions were 1 x 0 in an IIcI atmosphere.

When the luminous efficiency of the damaged electrodeless fluorescent lamp was measured after being continuously lit for 100 hours, only a decrease of 8% or less was observed.

(Example 5) AI=03-5iOz coating consisting of the following formulation/
8/Pi.

Inside, 3C. +(l'f3a)zcaFz
:Sb:Mn is dispersed by a ball mill, and in it,
A pre-cleaned Pyrex glass bulb with a diameter of 161 m and a length of 300 dragons was immersed into the glass.
A coating film was formed by pulling it out of the solution at a pulling rate of coat amount/minute.

ku^lx'5-3ift coating solution formulation〉81 (
OC411e)s: 1 2 gSi(OC
zlls) 4: l 3 g ethanol: 3 7.
6 1! Hydrochloric acid: 0.3g Water: 4.05g After removing the coating film formed on the outside of the bulb,
Firing was performed at 150° C. for 60 minutes in an atmosphere of 150° C.

Subsequently, the bulb was again immersed in the coating solution and pulled out of the solution at a pulling speed of 200 n/min to form a coating. After removing the coating film formed on the outside of the bulb, it was heated to 159'C in an HCI atmosphere.
After firing for 60 minutes, the tube was fired at 650° C. for 120 minutes in the atmosphere to form a phosphor IW on the inner wall surface of the bulb. Thereafter, Ar gas and Ig were sealed in this bulb to form an electrodeless fluorescent lamp.

When the obtained electrodeless fluorescent lamp was continuously lit at high frequency for 100 hours and the luminescence rate was measured, only a decrease of 10% or less was observed.

〔Effect of the invention〕

The fluorescent lamp of the present invention is as described above, and the phosphor layer that converts ultraviolet rays generated by discharging gases sealed in the bulb into visible light is coated with an organic metal compound solution containing phosphor particles. Dielectric material lI formed by firing
The above-mentioned phosphor particles are dispersed in Q, and the phosphor and glass that may cause blackening are replaced with a dielectric material to prevent contact with gases, resulting in excellent luminous flux. It has a deterioration preventing effect.

[Brief explanation of the drawing]

FIG. 1 is a layer configuration diagram illustrating the relationship between the phosphor and the dielectric film in the phosphor layer of the fluorescent lamp of the present invention. 1... Bulb 2... Fluorescent substance M 2a... Fluorescent particle 2b... Induction, B body 11 Agent Patent attorney Takehiko Matsumoto

Claims (3)

[Claims] (1) In a fluorescent lamp in which ultraviolet rays generated by discharging gases sealed in the bulb are converted into visible light by a phosphor layer provided on the inner wall of the bulb and extracted, the phosphor layer is 1. A fluorescent lamp, characterized in that the phosphor particles are dispersed in a dielectric film formed by applying and baking an organometallic compound solution containing phosphor particles. (2) The dielectric material constituting the dielectric film is Al_2O_3, S
Claim 1, which is at least one metal oxide selected from the group consisting of iO_2 and La_2O_2
Fluorescent lamps as described in section. (3) Claim 1 or 2, wherein the coating film of the organometallic compound solution is fired in a hydrogen halide atmosphere.
Fluorescent lamps as described in section.