JPH03238793A - Electroluminescence lamp - Google Patents

Abstract

PURPOSE:To improve water resistance of a light emitting layer by constituting an electroluminescence lamp of a material wherein ceramic or glass with a light emitting layer translucent is used as a binder, on which luminescent fluorescent bodies are dispersed. CONSTITUTION:An insulating pressure-resistant layer 2 is provided under a light emitting layer 1, while electrodes 3, 3' are provided on the light emitting layer 1 and under the insulating pressure-resistant layer 2, respectively. The whole body is covered by a water holding nylon film 5 and further sealed by a translucent waterproof package film 9. The light emitting layer is formed of a material with translucent ceramic or glass used as a binder, on which luminescent fluorescent bodies are dispersed. Thus water resistance of the light emitting layer 1 is improved so that drop in brightness due to moisture is small, enabling a long service life even with slightly careless water proofing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a distributed electroluminescent lamp (
This is related to the EL clamp (hereinafter referred to as EL clamp).

[Conventional technology]

Conventional EL clamps use a luminescent phosphor such as zinc sulfide doped with a luminescent center material such as manganese or copper as a binder, and a composition in which methane is dispersed in Kikoko resin as a constituent material of the luminescent layer. has been used. However, this type of luminescent phosphor has the problem that its luminescent life is greatly reduced due to water absorption.On the other hand, the organic polymer resin binder has poor waterproof properties, so the EL clamp body is replaced with an expensive fluorine-based waterproof resin film. need to be covered.

[Problem to be solved by the invention]

Therefore, an object of the present invention is to provide an EL clamp having a dispersed light-emitting layer with excellent water resistance and a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above object, the EL clamp of the present invention is characterized in that the light-emitting layer is made of a material in which a light-transmitting ceramic or glass is used as a binder and a light-emitting phosphor is dispersed therein.

Ceramic or glass generally has superior waterproof properties compared to organic polymer resins. The EL clamp luminescent phosphor of the present invention, which has a luminescent layer made of ceramic or glass as a binder, absorbs only a small amount of water, and therefore its brightness is less likely to decrease due to water absorption.

In the present invention, examples of the translucent ceramic or glass binder include lead titanate, lead zirconate titanate,
Examples include barium titanate, titanium oxide, zirconium oxide, titanium oxide-zirconium oxide, magnesium oxide, alumina, quartz glass, borosilicate glass, boron oxide glass, and various low-melting glasses or frits for electronic devices.

In general, such binder materials, especially lead titanate, lead zirconate titanate, barium titanate, titanium oxide, zirconium oxide, titanium oxide-zirconium oxide, etc., have a high dielectric constant, so the EL clamp of the present invention, Concentrating the electric field on the light-emitting layer is effective, and light can be emitted at a low voltage.

As the luminescent phosphor, a phosphor such as the above-mentioned zinc sulfide doped with a luminescent center material such as manganese or copper, or various other phosphors conventionally known in this field may be used. It will be done.

Regarding the method for forming the luminescent layer in the present invention, if the binder used has a low melting point, low softening point, or low sintering temperature and is lower than the heat resistance temperature of the luminescent phosphor used, the binder or A homogeneous mixture of the precursor powder and the luminescent phosphor may be directly heated or sintered to ceramize or vitrify the binder component and form it into a thin plate. If the curing temperature is higher than the heat resistance temperature of the luminescent phosphor used, use an organometallic compound of the metal element constituting the binder, such as a metal alkoxide or a chelate compound, and mix it with a non-aqueous solvent such as alcohol. Prepare a sol by diluting it to an appropriate concentration (if the organometallic compound used is sensitive to water, it is recommended to stabilize it with acetylacetone, etc.), then add a luminescent phosphor to the obtained sol and spread it uniformly. After mixing, the sol is coated directly on the back electrode or on the insulating layer on the back electrode by an appropriate method such as dipping or using a spinner, and heat-treated to form a transparent light-emitting layer.

〔Example〕

An explanation will be given below based on an EL clamp embodiment of the present invention.

Figure 1 shows the cross-sectional structure of one embodiment.
As shown by the arrow in the L-clamp diagram, a dielectric breakdown voltage layer 2 is provided below the six luminescent layers l that emit light from only one side, and the dielectric breakdown voltage layer 2 is provided above the luminescent layer 1 and below the dielectric breakdown voltage layer 2. Each electrode is provided with an angle of 3.3°. The entire structure is covered with a water-trapping nylon film 5, and the entire structure is further sealed with a waterproof exterior film 9, which is translucent at least in the portion facing the light emitting surface. Note that, as described above, in the EL clamp of the present invention, the light-emitting layer 1 has excellent water resistance, so the water-trapping nylon film 5 may be omitted.
Furthermore, the waterproof exterior film 9 does not necessarily need to be an expensive one, which required a conventional organic polymer resin binder type EL clamp, and furthermore, since the luminescent layer 1 is made of ceramic or glass as a binder. Generally, the dielectric strength is high, so the dielectric strength layer 2 can be omitted.

〔Effect of the invention〕

Since the EL clamp of the present invention is configured as described above, it has the following effects.

(1) Since the light-emitting layer has excellent water resistance, a waterproofing treatment that is considerably lighter and cheaper than the waterproofing treatment applied to conventional organic dispersed EL lamps is sufficient. For example, material costs can be reduced by omitting a water-trapping film or the like.

Alternatively, even if the waterproofing is done to the same degree or a little looser than the conventional one, there is less deterioration in waterproofness due to moisture and the product has a long life.

(2) Since the light-emitting layer generally has a high voltage strength, the insulation voltage layer can be omitted, and from this point of view as well, material costs and production steps can be reduced.

(3) Since the binder component used in the present invention generally has a high dielectric constant, the EL clamp of the present invention and electric field concentration on the light emitting layer are effective, and it is possible to emit light at a low voltage. can.

The EL clamp of the present invention can be made thinner in total thickness than conventional products, can be manufactured at low cost, and has a long life. It is extremely useful as a light source for the back of a liquid crystal display, a display part for multiple measuring instruments, a panel display for a personal computer, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the EL clamp of the present invention. 1: Luminescent layer 2: Insulating voltage layer 3.3': Pole 5: Water-trapping nylon film 9
:Waterproof exterior film Figure 1 Tip valve

Claims (1)

[Claims] An electroluminescent lamp characterized in that the luminescent layer is made of a material in which a translucent ceramic or glass is used as a binder and a luminescent phosphor is dispersed therein.