JP2003217833A - Back sealing can for organic electroluminescence display and manufacturing method for the sealing can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back sealing can for an organic EL display and a manufacturing method for the sealing can, having good formability and capable of increasing the life of an organic EL element. <P>SOLUTION: This organic EL display 10 includes a glass base plate 11 made of soda lime, the organic EL element 12 formed on the surface of the glass base plate 11, a pair of organic EL driving patterns 13 formed on the surface of the glass base plate 11 on both sides of the organic EL element 12, and the back sealing can 20 for the organic EL display, which is bonded on the surface of the glass base plate 11 through the organic EL driving pattern 13 by an adhesive layer 14 to accommodate the organic EL element 12 inside. The back sealing can 20 includes a dealkalization part 21 provided on the outermost surface layer, which is subjected to dealkalization processing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to organic electroluminescence (hereinafter referred to as "electroluminescence").
L ") a backside sealing can for a display, and more particularly to a backside sealing can for an organic EL display made of soda lime glass, and a method for producing the sealing can.

[0002]

2. Description of the Related Art An organic EL device is a display device which performs a charge injection / recombination type light emitting operation by interposing an organic multilayer film composed of a hole transport layer, a light emitting layer and an electron transport layer between an anode and a cathode. Therefore, in addition to lowering the driving voltage, it is possible to realize a wider emission color range due to the variety of organic materials. The organic EL element is used as a light emitting source of an organic EL display.

FIG. 3 is a sectional view showing a schematic structure of a conventional organic EL display.

In FIG. 3, a conventional organic EL display 40 includes a glass substrate 41 made of soda lime glass or non-alkali glass, an organic EL element 42 formed on the surface of the glass substrate 41, and an organic EL element 42. A pair of organic EL drive patterns 43 formed on the surface of the glass substrate 41 on both sides, and an organic EL drive pattern 4 by an adhesive layer 44 so as to accommodate the organic EL elements 42 inside thereof.
And a rear surface sealing can 50 for an organic EL display, which is adhered to the surface of the glass substrate 41 through the intermediary of 3.

The material of the glass substrate 41 is usually soda glass which has been subjected to alkali elution prevention treatment by a vacuum film forming method or the like, but when the TFT is formed on the glass substrate 41 by activating the organic EL display system. , Organic EL element 42
It is a non-alkali glass with no elution of alkaline components that deteriorate the. On the other hand, as the material of the backside sealing can 50, a metal such as SUS (stainless steel) is used as the glass substrate 4.
Since the difference in thermal expansion from that of No. 1 becomes large and the adhesion of the backside sealing can 50 to the glass substrate 41 deteriorates, soda glass or alkali-free glass is used.

As materials for the glass substrate 41 and the back side sealing can 50, a plurality of sealing cans 50 are integrally arranged in a matrix for mass production of the organic EL display 40 (multi-cavity production). A plurality of glass substrates 41 in which sealing can members made of
It is preferable to use glass that can be easily cut into individual organic EL displays 40 after being bonded to a glass substrate member made of.

However, of the soda lime glass and the alkali-free glass, the alkali-free glass has a low softening temperature, although it has a small amount of eluted alkali, so that it is inferior in moldability to soda-lime glass.

[0008]

However, when soda lime glass is used as the material of the sealing can 50, the organic EL is caused by the alkaline component eluted from the glass.
There is a problem that the element 42 deteriorates and its life is shortened.

An object of the present invention is to provide a backside sealing can for an organic EL display which can improve moldability and extend the life of the organic EL device, and a method for manufacturing the sealing can.

[0010]

In order to achieve the above object, the back sealing can according to claim 1 is a soda lime glass back sealing can, wherein the back sealing can has an outermost surface layer. The alkali metal ion concentration of is lower than the alkali metal ion concentration inside the outermost surface layer.

According to the back sealed can of claim 1, since the alkali metal ion concentration of the outermost surface layer is lower than the alkali metal ion concentration inside the outermost surface layer of the backside sealed can, It is possible to suppress the precipitation of ions on the surface of the backside sealing can and prevent the deterioration of the organic EL element due to the alkali metal ions, thereby improving the moldability and extending the life of the organic EL element.

The backside sealing can according to claim 2 is the backside sealing can according to claim 1, wherein the outermost surface layer has a thickness of 1 nm.
It is characterized in that it is 1 μm or less.

According to the back sealing can of claim 2, since the thickness of the outermost surface layer of the back sealing can is 1 nm or more and 1 μm or less, the effect of the back sealing can according to claim 1 is ensured. Can be played.

According to a third aspect of the present invention, there is provided a rear sealing can according to the second aspect, wherein the outermost surface layer has a thickness of 10 n.
It is characterized by being m or more and 100 nm or less.

According to the back sealing can of claim 3, since the thickness of the outermost surface layer of the back sealing can is 10 nm or more and 100 nm or less, the effect of the back sealing can according to claim 1 can be more reliably achieved. Can play.

According to a fourth aspect of the present invention, there is provided a rear sealed can according to any one of the first to third aspects, wherein the average value of the alkaline earth metal ion concentration in the outermost surface layer is the maximum. It is characterized by being 80% or more of the average value of the internal alkaline earth metal ion concentration following the surface layer.

According to the back-sealed can of claim 4, the average value of the alkaline earth metal ion concentration in the outermost surface layer of the back-sealed can corresponds to the internal alkaline earth metal ion concentration following the outermost surface layer. Since it is 80% or more of the average value, the effect of the back side sealing can according to any one of claims 1 to 3 can be reliably exhibited.

In order to achieve the above object, the manufacturing method according to claim 5 is a manufacturing method in which a glass base plate made of soda lime glass is heat-molded, and the heat-molded glass base plate is subjected to dealkalization treatment. It is characterized by

According to the manufacturing method of claim 5, the heat-molded glass base plate is subjected to dealkalization treatment, so that the moldability can be improved and the life of the organic EL device can be extended. Can be provided at low cost.

The manufacturing method according to claim 6 is characterized in that, in the manufacturing method according to claim 5, the dealkalizing treatment is a treatment of immersing the glass base plate in hot water.

According to the manufacturing method of the sixth aspect, since the dealkalizing treatment is a treatment of immersing the glass base plate in hot water, the dealkalizing treatment of the soda lime glass can be efficiently performed.

The manufacturing method according to claim 7 is the same as the manufacturing method according to claim 6, wherein the temperature of the hot water is 70 ° C. or higher.
It is characterized in that the temperature is 0 ° C. or lower.

According to the manufacturing method of the seventh aspect, since the temperature of the hot water is 70 ° C. or higher and 100 ° C. or lower, the soda lime glass can be dealkinated more efficiently.

The manufacturing method according to claim 8 is the manufacturing method according to any one of claims 5 to 7, characterized in that a polyvalent metal ion is added to the hot water.

According to the manufacturing method of claim 8, since the polyvalent metal ion is added to the warm water, the polyvalent metal ion is adsorbed on the silica surface which is the skeletal component of soda lime glass to dissolve the silica. Therefore, it is possible to prevent damage to the outermost surface layer of the backside sealing can.

The manufacturing method according to claim 9 is the manufacturing method according to claim 8, wherein the polyvalent metal ion is an aluminum ion.

According to the manufacturing method of the ninth aspect, since the polyvalent metal ion is an aluminum ion, the polyvalent metal ion can be inexpensive.

The manufacturing method according to claim 10 is the manufacturing method according to any one of claims 6 to 9, characterized in that the pH of the hot water is 3 or more and 10 or less.

According to the manufacturing method of the tenth aspect, since the pH of the warm water is 3 or more and 10 or less, it is possible to prevent the dissolution of silica, and thus suppress the damage of the outermost surface layer of the rear sealing can. .

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION As a result of earnest studies to achieve the above object, the present inventor has found that in a backside sealing can made of soda lime glass for an organic electroluminescent display, the backside sealing can has an outermost surface. The concentration of alkali metal ions in the layer is lower than the concentration of alkali metal ions inside the outermost surface layer, and preferably the thickness of the outermost surface layer is 1 nm.
When the thickness of the outermost surface layer is 10 nm or more and 100 nm or less, deterioration of the organic EL element due to alkali metal ions can be prevented, moldability is improved, and the organic EL element It has been found that the life can be increased.

Further, the present inventor, in the method for producing a backside sealing can for an organic electroluminescence display in which a glass base plate made of soda lime glass is heat-molded, the heat-molded glass base plate is dealkalized, preferably When the glass base plate is immersed in warm water, the deterioration of the organic EL element due to alkali metal ions can be prevented, the moldability can be improved and the life of the organic EL element can be extended. It has been found that cans can be provided at low cost.

The present invention was made based on the results of the above research.

Hereinafter, the organic EL according to the embodiment of the present invention
The structure of an organic EL display including a backside sealing can for a display will be described in detail with reference to FIG.

FIG. 1 shows an organic E according to an embodiment of the present invention.
It is sectional drawing of the organic EL display provided with the back surface sealing can for L displays.

Referring to FIG. 1, an organic EL display 10 according to an embodiment of the present invention includes a glass substrate 11 made of soda lime and an organic E formed on the surface of the glass substrate 11.
L element 12, a pair of organic EL drive patterns 13 formed on the surface of the glass substrate 11 on both sides of the organic EL element 12, and an organic EL drive by an adhesive layer 14 so as to house the organic EL element 12 therein. The organic EL display backside sealing can 20 is adhered to the surface of the glass substrate 11 through the pattern 13. The rear sealing can 20 has a dealkalized portion 2 having a dealkalized surface layer.
1 is provided.

The thickness and alkali metal ion concentration of the dealkalized portion 21 of the outermost surface layer of the rear sealing can 20 are as follows.

When the material of the rear sealing can 20 is soda lime glass, when the alkali metal ion concentration in the dealkalizing section 21 is lower than the alkali metal ion concentration inside the outermost surface layer, the alkali metal ions are It becomes difficult to deposit (exude) on the surface, and it is possible to prevent the reliability of the backside sealing can 20 from being deteriorated (the formation of dark spots due to the deterioration of the organic EL element) due to the alkali metal ions. The adhesiveness with the glass substrate 11 can be improved.

Therefore, the thickness of the dealkalizing part 21 is preferably 1 nm or more and 1 μm or less, more preferably 10 n.
It is m or more and 100 nm or less. The thickness of the outermost surface is 1n
If it is less than m, the precipitation of alkali metal ions cannot be sufficiently prevented, and if it exceeds 10 μm, the surface strength of the glass is lowered, and conversely the reliability is lowered.

When the alkaline earth metal ion concentration in the dealkalization section 21 becomes 80% or less, the surface of the dealkalization section 21 becomes porous, and alkali metal ions are easily accumulated in the porous section and migrate. Therefore, when the alkaline earth metal ion concentration is greatly reduced, the alkali metal ions are easily deposited. Therefore, the dealkalizing part 2
The alkaline earth metal ion concentration in the outermost surface layer of 1 is
The average value is preferably 80% or more of the internal alkaline earth metal ion concentration following the outermost surface layer.

The dealkalization treatment of the outermost surface layer of the rear sealing can 20 is performed by first heat-molding a soda-lime glass base plate and subjecting the heat-formed glass base plate to the dealkalizing process. As a result, the concentration of alkali metal ions in the outermost surface layer of the glass base plate is made smaller than that in the inside of the outermost surface layer.

The dealkalizing treatment is performed by immersing the glass base plate in warm water. Thereby, the alkali metal ions of the outermost surface layer of the glass base plate can be eluted into the warm water. In this case, the temperature of hot water is 70 ° C or higher and 100
It is preferably not higher than ° C (boiling point). The temperature of hot water is 70
If the temperature is lower than ℃, the efficiency of dealkalization is lowered, and
Boiling occurs when the temperature exceeds 0 ° C (boiling point). The time for dealkalization treatment depends on the required reliability, but is preferably 1 minute or more and 3 hours or less.

When a polyvalent metal ion is added to the warm water, the polyvalent metal ion is adsorbed on the silica surface, which is the skeleton component of the glass of the glass base plate, to prevent the dissolution of silica, and thus the glass base. It is possible to suppress damage to the outermost surface layer of the plate and efficiently perform dealkalization treatment. The polyvalent metal ion is preferably aluminum nitrate or aluminum ion (trivalent). In particular, the aluminum ion has a high effect of suppressing silica dissolution, high safety, and is inexpensive. The concentration of polyvalent metal ions is preferably about 10 ppm to 0.1%.

The pH of the warm water is preferably 3 or more and 10 or less. When the pH of warm water is 3 or less, alkaline earth metal ions are easily eluted, and when the pH is over 10, alkali metal ions are difficult to elute, which promotes dissolution of silica and damages the outermost surface layer of the glass base plate. Easily occur.

[0044]

EXAMPLES Next, examples of the present invention will be specifically described.

The inventor of the present invention has an organic EL display 10 having nine types of soda lime glass backside sealing cans 20 that differ only in the thickness of the dealkalized portion 21 of the outermost surface layer of the soda lime glass backing can 20. (Examples 1 to 5, Comparative Examples 1 to 4), and the alkaline earth in the interior 22 following the dealkalization part 21 of the rear sealing can 20 with respect to the average value of the alkaline earth metal ion concentration of the dealkalization part 21. Organic EL display 1 having 9 kinds of soda lime glass rear sealing cans 20 that differ only in the ratio of the average value of the metal ion concentration
0 (Examples 6 to 10 and Comparative Examples 5 to 8), and an organic EL display 10 (Comparative Example 9) having a soda lime glass backside sealing can 20 not subjected to dealkalization treatment was prepared. For these organic EL displays 10, evaluation of crystal precipitation amount of alkali metal salt, and organic EL display
The dark spot generation time of the device 12 and the strength of the back side sealing can were evaluated.

The evaluation of the amount of crystal precipitation of the alkali metal salt was conducted by using the organic EL display 10 at an ambient temperature of 60 ° C. and a humidity of 80%.
Back exposure can 20 after exposed and left for 120 hours under the environment
The number of grains of the alkali metal salt crystals (glass faded grains) is counted in the visual field range by observing the crystals of the alkali metal salt deposited on the surface of the above with an optical microscope dark field observation (× 200 times). The evaluation is performed by ranking A to E, and it is shown that as the evaluation A progresses to the evaluation E, the precipitation amount of the alkali metal salt crystals increases. Specifically, the number of grains of alkali metal salt crystals is 0 to 10 / field for evaluation A, 10 to 50 / field for evaluation B, and 50 to 200 / field for evaluation C.
Evaluation D shows a state of 200 to 500 pieces / visual field, and evaluation E shows a state of 500 pieces or more / visual field.

The dark spot occurrence time of the organic EL element 12 is evaluated by storing the above organic EL display 10 in a high temperature environment of an ambient temperature of 100 ° C. in a driving state and measuring the time until a dark spot occurs. Is.

The strength of the rear sealing can 20 is evaluated by applying a load used for sealing the glass substrate 11 to the vicinity of the central portion of the surface of the rear sealing can 20 to check whether the rear sealing can 20 is damaged or not. Is. When the back side sealing can 20 is sealed to the glass substrate 11 on which the organic EL is formed with an adhesive, pressure is applied with a constant force, and at this time, the back side sealing can 20 may be damaged due to deformation. . For this reason, the backside sealing can 20 must withstand a certain amount of pressure deformation, and the above-described evaluation assuming this step is necessary. The evaluation is performed by ranking A to C, and the strength decreases as the evaluation A progresses to the evaluation C. Specifically, the evaluation A is in a state without breakage, and the evaluation B is in the sealing step in consideration of the variation of breakage. A state in which there is a possibility of breakage, evaluation C shows a state in which there is a considerable probability of breakage in the sealing process.

Table 1 shows the above Examples 1 to 5 and Comparative Examples 1 to 1.
4 is a comparative table showing the results of evaluation of the amount of alkali metal salt crystals precipitated for 4, 9 and dark spot generation time of the organic EL element 12 and back sealing can strength evaluation.

[0050]

[Table 1]

In Table 1, the comprehensive evaluation of the thickness of the dealkalized portion 21 is shown as "good", "good" and "bad" in terms of the thickness of the dealkalized part 21. From Table 1, evaluation of crystal precipitation amount of alkali metal salt and organic EL
From the results of the dark spot generation time evaluation of the element 12 and the back sealing can strength evaluation, the thickness of the dealkalized portion 21 is 1 nm.
It is preferably not less than 1 μm and not less than 10 nm and not more than 10
It was found that it is more preferable that the thickness is 0 nm or less.

Table 2 shows Examples 6 to 10 and Comparative Example 5 described above.
10 is a comparative table showing the evaluation results of the amount of alkali metal salt crystals precipitated and the evaluation results of the dark spot generation time of the organic EL element 12 for the samples Nos.

[0053]

[Table 2]

In Table 2, a comprehensive evaluation of the ratio of the average alkaline earth metal ion concentration value of the dealkalized portion 21 of the rear sealing can 20 to the average alkaline earth metal ion concentration value of the inside 22 is given by this alkaline earth metal ion concentration value. As a ratio of the average value of the metal ion concentration, a favorable one is shown as "good" and an unfavorable one is shown as "bad". From Table 2, from the results of evaluation of the amount of crystal precipitation of the alkali metal salt and evaluation of the dark spot generation time of the organic EL element 12, the dealkalized portion 21 of the backside sealing can 20 was evaluated.
It was found that it is preferable that the ratio of the average value of alkaline earth metal ion concentration in (4) to the average value of alkaline earth metal ion concentration in the interior 22 is 80% or more.

In addition, the present inventor has made the rear sealing made of eight kinds of soda lime glass subjected to the dealkalization treatment (treatment example 1) with warm water at different temperatures for a predetermined time in the dealkalization treatment on the rear sealing can 20. Organic EL display 10 having a can (Examples 11 to 15, Comparative Examples 10 to 1)
2) Further, in the dealkalization treatment for the backside sealing can 20, the dealkalization treatment (treatment example 2) is performed for a predetermined time with different hot water depending on whether or not a polyvalent metal ion such as AlNO ₃ is added at different temperatures. Organic EL display 1 having 6 types of soda lime glass backside sealing cans applied
0 (Examples 16 to 18, Comparative Examples 13 to 15),
In the dealkalization treatment for the back sealing can 20, an organic EL display having 10 kinds of soda lime glass back sealing cans which have been dealkalized (treatment example 3) with warm water having different pHs at a predetermined temperature for a predetermined time 10 (Examples 19 to 23, Comparative Examples 16 to 20) were prepared.

For the organic EL displays 10 of the above Examples and Comparative Examples, the efficiency of dealkalization treatment and the appearance of the surface of the rear sealing can 20 were inspected.

The efficiency of the dealkalization treatment is evaluated by the difference in the dealkalization treatment (difference in hot water temperature, difference in presence or absence of addition of polyvalent metal ions, difference in pH of hot water) of the thickness of the dealkalization part 21. It is evaluated by comparison.

The appearance of the surface of the rear sealing can 20 is a relative evaluation of the degree of scratches caused by etching, which are generally called latent scratches, by dark-field observation with an optical microscope (× 200 times). . The evaluation is performed by ranking A to C, and it is shown that as the evaluation A progresses to the evaluation C, the number of scratches on the surface of the rear sealing can 20 increases. Specifically, it is shown that the evaluation A is 0 / field, the evaluation B is 0 to 0.5 / field, and the evaluation C is 0.5 or more / field.

Table 3 shows the dealkalizing part 21 of the rear sealing can 20 with respect to the temperature of the hot water for dealkalizing treatment according to the treatment example 1.
4 is a comparative table showing the relationship of the thickness of the.

[0060]

[Table 3]

From Table 3, it was found that the temperature of the hot water for dealkalizing treatment is preferably 70 ° C. or higher.

Table 4 shows the relationship between the thickness of the dealkalized portion 21 of the rear sealing can 20 and the appearance of the surface of the rear sealing can 20 with and without the addition of polyvalent metal ions to the hot water for dealkalizing treatment according to Treatment Example 2. It is the comparison table which showed.

[0063]

[Table 4]

From Table 4, it was found that it is preferable to add polyvalent metal ions to the hot water for dealkalizing treatment.

Table 5 shows the dealkalizing part 21 of the rear sealing can 20 with respect to the pH of the hot water for dealkalizing treatment according to Treatment Example 3.
And the ratio of the alkaline earth metal ion concentration average value of the dealkalized part 21 and the alkaline earth metal ion concentration average value of the interior 22, and a comparison table showing the relationship between the appearance inspection of the surface of the rear sealing can 20. is there.

[0066]

[Table 5]

In Table 5, p of hot water for dealkalization treatment
The overall evaluation of H is shown as evaluation ◯, evaluation Δ, and evaluation X from the preferred pH of the hot water for dealkalizing treatment. From Table 5, it was found that the pH of the hot water for dealkalizing treatment is preferably 3 or more and 10 or less.

FIG. 2 is a sectional view of an organic EL display having a backside sealing can for an organic EL display according to another embodiment of the present invention.

The organic EL display 30 shown in FIG.
For mass production of the organic EL display 30 (multi-cavity production), rear sealing can members composed of a plurality of rear sealing cans 32 integrally arranged in a matrix were also integrally arranged in a matrix. It is cut into individual organic EL displays 30 after adhering to a glass substrate member composed of a plurality of glass substrates 31. Back sealing can 32
The organic EL display 10 shown in FIG. 1 differs from the organic EL display 10 shown in FIG. 1 in that the end surface 34 of the cut surface is not dealkalized. Rear sealing can 3 not subjected to this dealkalization treatment
Since the second end face 34 is outside the portion where the organic EL element 35 is sealed, the organic EL element 35 does not deteriorate even if the end face 34 is not dealkalized.

[0070]

As described in detail above, according to the back sealing can of claim 1, the back sealing can has an alkali metal ion concentration in the outermost surface layer of the inner surface of the inner surface of the rear sealing can. Since it is lower than the ion concentration, it is possible to suppress the precipitation of alkali metal ions on the surface of the backside sealing can and prevent the deterioration of the organic EL element due to the alkali metal ions, thereby improving the moldability and improving the organic EL element. The life can be increased.

According to the back-sealed can of claim 2, since the thickness of the outermost surface layer of the back-sealed can is 1 nm or more and 1 μm or less, the effect of the back-sealed can of claim 1 is ensured. Can be played.

According to the back-sealed can of claim 3, since the thickness of the outermost surface layer of the back-sealed can is 10 nm or more and 100 nm or less, the effect of the back-sealed can of claim 1 can be more reliably achieved. Can play.

According to the back sealed can of claim 4, the average value of the alkaline earth metal ion concentration in the outermost surface layer of the back sealed can is Since it is 80% or more of the average value, the effect of the back side sealing can according to any one of claims 1 to 3 can be reliably exhibited.

According to the manufacturing method of claim 5, the heat-molded glass base plate is subjected to dealkalization treatment, so that the moldability can be improved and the life of the organic EL element can be extended. Can be provided at low cost.

According to the manufacturing method of the sixth aspect, since the dealkalizing treatment is a treatment of immersing the glass base plate in hot water, the dealkalizing treatment of the soda lime glass can be efficiently performed.

According to the manufacturing method of the seventh aspect, since the temperature of the hot water is 70 ° C. or higher and 100 ° C. or lower, the dealkalizing treatment of the soda lime glass can be performed more efficiently.

According to the manufacturing method of claim 8, since the polyvalent metal ion is added to the warm water, the polyvalent metal ion is adsorbed on the silica surface which is the skeletal component of soda lime glass to dissolve the silica. Therefore, it is possible to prevent damage to the outermost surface layer of the backside sealing can.

According to the manufacturing method of the ninth aspect, since the polyvalent metal ion is an aluminum ion, the polyvalent metal ion can be made inexpensive.

According to the manufacturing method of the tenth aspect, since the pH of the warm water is 3 or more and 10 or less, the dissolution of silica can be prevented, and the damage of the outermost surface layer of the rear sealing can can be suppressed. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an organic EL display including a backside sealing can for an organic EL display according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an organic EL display including a backside sealing can for an organic EL display according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a schematic structure of a conventional organic EL display.

[Explanation of symbols]

10 Organic EL display 11 glass substrate 12 Organic EL device 13 Organic EL pattern 14 Adhesive layer 20 Backside sealing can for organic EL display 21 Dealkalizing part

Continued front page    F term (reference) 3K007 AB12 AB18 BB01 DB03 FA02                 4G059 AA08 AB01 AB09 AB11 AC18                       AC24 BB04 BB12

Claims (10)

[Claims] 1. A backside sealing can made of soda lime glass for an organic electroluminescence display, wherein the backside sealing can has an alkali metal ion concentration in an outermost surface layer thereof continuing from the outermost surface layer. The backside sealing can for an organic electroluminescence display, which is characterized by being lower than the above. 2. The thickness of the outermost surface layer is 1 nm or more and 1 μm.
The backside sealing can for an organic electroluminescence display according to claim 1, wherein: 3. The outermost surface layer has a thickness of 10 nm or more 10
It is 0 nm or less, The backside sealing can for organic electroluminescent displays of Claim 2 characterized by the above-mentioned. 4. The average value of the alkaline earth metal ion concentration in the outermost surface layer is 80% or more of the average value of the alkaline earth metal ion concentration inside the outermost surface layer. Item 5. A backside sealing can for an organic electroluminescence display according to any one of items 1 to 3. 5. A method of manufacturing a backside sealing can for an organic electroluminescence display, which heat-molds a glass base plate made of soda lime glass, wherein the heat-molded glass base plate is subjected to dealkalization treatment. A method for manufacturing a backside sealing can for an organic electroluminescence display. 6. The manufacturing method according to claim 5, wherein the dealkalizing treatment is a treatment of immersing the glass base plate in hot water. 7. The manufacturing method according to claim 6, wherein the temperature of the hot water is 70 ° C. or higher and 100 ° C. or lower. 8. The manufacturing method according to claim 5, wherein a polyvalent metal ion is added to the warm water. 9. The manufacturing method according to claim 8, wherein the polyvalent metal ion is an aluminum ion. 10. The manufacturing method according to claim 6, wherein the pH of the hot water is 3 or more and 10 or less.