Organic electroluminescent device and method of preparing the same
First Claim
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1. An organic electroluminescent device, comprising:
- a substrate;
an organic electroluminescent unit formed on the substrate, the organic electroluminescent unit comprising a first electrode, a second electrode and an organic luminescent unit interposed between the first electrode and the second electrode;
a sealant directly formed on the substrate;
a sealing substrate covering the organic electroluminescent unit, the sealing substrate contacting the sealant; and
a sealing layer formed on the sealing substrate, the sealing layer comprising a cohesion layer attached to the sealing substrate, a transparent polymer layer formed on the cohesion layer, and a transparent moisture absorption layer formed on the transparent polymer layer to absorb moisture in a sealed space formed by joining the sealing substrate with the substrate, the sealing layer preventing Rayleigh scattering, the transparent moisture absorption layer comprising nano-sized porous particles and pores, an average diameter of the pores being less than 100 nm, the pores being formed between the nano-sized porous particles.
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Abstract
An organic electroluminescent device and a method of preparing the same are provided. The organic electroluminescent device includes a sealing layer which is formed on a sealing substrate, and which includes a cohesion layer, a transparent polymer layer, and a transparent moisture absorption layer. Since the transparent moisture absorption layer of the organic electroluminescent device is provided to a sealing substrate using an attaching method, the organic electroluminescent device has an improved life span property due to a firm sealed structure and better light extraction efficiency due to the transparent moisture absorption layer below the sealing substrate.
12 Citations
18 Claims
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1. An organic electroluminescent device, comprising:
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a substrate; an organic electroluminescent unit formed on the substrate, the organic electroluminescent unit comprising a first electrode, a second electrode and an organic luminescent unit interposed between the first electrode and the second electrode; a sealant directly formed on the substrate; a sealing substrate covering the organic electroluminescent unit, the sealing substrate contacting the sealant; and a sealing layer formed on the sealing substrate, the sealing layer comprising a cohesion layer attached to the sealing substrate, a transparent polymer layer formed on the cohesion layer, and a transparent moisture absorption layer formed on the transparent polymer layer to absorb moisture in a sealed space formed by joining the sealing substrate with the substrate, the sealing layer preventing Rayleigh scattering, the transparent moisture absorption layer comprising nano-sized porous particles and pores, an average diameter of the pores being less than 100 nm, the pores being formed between the nano-sized porous particles. - View Dependent Claims (2, 3, 4, 5)
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6. A method of preparing an organic electroluminescent device, the method comprising:
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providing a sealing substrate; forming a sealing layer comprising a cohesion layer attached to the sealing substrate, a transparent polymer layer formed on the cohesion layer, and a transparent moisture absorption layer formed on the transparent polymer layer, the sealing layer preventing Rayleigh scattering, the transparent moisture absorption layer comprising nano-sized porous particles and pores, an average diameter of the pores being less than 100 nm, the pores being formed between the nano-sized porous particles; attaching the sealing layer to the sealing substrate; preparing a substrate on which an organic electroluminescent unit is formed, the organic electroluminescent unit comprising a first electrode, a second electrode and an organic luminescent unit interposed between the first electrode and the second electrode; applying a sealant to at least one of the sealing substrate and the substrate; and joining the sealing substrate with the substrate via the sealant to form a sealed space in which the organic luminescent unit and the sealing layer are positioned, the sealing layer attached to the sealing substrate, the sealing substrate covering the organic electroluminescent unit, the sealing substrate contacting the sealant, a portion of the sealed space being empty, the transparent polymer layer absorbing moisture in the sealed space. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An organic electroluminescent device, comprising:
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a substrate on which an organic electroluminescent unit is formed, the organic electroluminescent unit comprising a first electrode, a second electrode and an organic luminescent unit interposed between the first electrode and the second electrode; a sealing substrate joined with the substrate via a sealant to produce a sealed space in which the organic luminescent unit is positioned; and a sealing layer positioned inside the sealed space and attached to the sealing substrate, the sealing layer comprising a cohesion layer attached to the sealing substrate, a transparent polymer layer and a transparent moisture absorption layer to absorb moisture in the sealed space, a portion of the sealed space being empty, the sealing layer preventing Rayleigh scattering, the transparent moisture absorption layer comprising nano-sized porous particles and pores, an average diameter of the pores being less than 100 nm, the pores being formed between the nano-sized porous particles.
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Specification