EL display device utilizing light-emitting organic compounds and method for forming the same
First Claim
Patent Images
1. A digital camera comprising:
- a main body;
a display portion;
an image receiving portion; and
an operation switch,the display portion comprising;
a plurality of pixels formed over a substrate, each of the plurality of pixels comprising a light-emitting element,wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, andwherein the EL layer includes ionic impurities at the concentration of 0.1 ppm or lower.
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Abstract
By repeating a purification process of a light-emitting organic compound several times, a thin film made of the light-emitting organic compound to be used in an EL display device contains ionic impurities at the concentration of 0.1 ppm or lower and has a volume resistivity in the range of 3×1010 Ωcm or larger. By using such a thin film as a light-emitting layer in the EL device, a current caused by reasons other than the carrier recombination can be prevented from flowing through the thin film, and deterioration caused by unnecessary heat generation can be suppressed. Accordingly, it is possible to obtain an EL display device with high reliability.
89 Citations
18 Claims
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1. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.1 ppm or lower. - View Dependent Claims (2, 13)
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3. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.01 ppm or lower. - View Dependent Claims (4, 14)
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5. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a glass substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.1 ppm or lower and has a volume resistivity of 3×
1010 Ω
cm or larger. - View Dependent Claims (6, 15)
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7. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a glass substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.01 ppm or lower and has a volume resistivity of 3×
1010 Ω
cm or larger. - View Dependent Claims (8)
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9. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.1 ppm or lower and has a volume resistivity of 1×
1011 to 1×
1012 Ω
cm. - View Dependent Claims (10, 16, 17)
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11. A digital camera comprising:
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a main body; a display portion; an image receiving portion; and an operation switch, the display portion comprising; a plurality of pixels formed over a substrate, each of the plurality of pixels comprising a light-emitting element, wherein the light-emitting element comprises an EL layer including a light-emitting organic compound, and wherein the EL layer includes ionic impurities at the concentration of 0.01 ppm or lower and has a volume resistivity of 1×
1011 to 1×
1012 Ω
cm. - View Dependent Claims (12, 18)
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Specification