# US 2019/0173039 A1 · Top emission organic el element and manufacturing method thereof

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- Number: US 2019/0173039 A1
- Document ID: US20190173039A1
- Status: Published application
- Kind: A1
- Application number: 16/199,614
- Filed: 2018-11-26
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Junri Ishikura; Norihiko Ochi; Naoari Shibata; Masayuki Morohashi; Shigeki Kondo
- Web page: https://patentgrep.com/patent/US20190173039A1

## CPC

- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H01J 9/00: Apparatus or processes specially adapted for the manufacture {, installation, removal, maintenance} of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- H10D 30/6739: {Conductor-insulator-semiconductor electrodes}
- H10K 50/813: characterised by their shape
- H10K 50/82: Cathodes
- H10K 50/8426: {Peripheral sealing arrangements, e.g. adhesives, sealants}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 71/135: {using ink-jet printing}
- H10K 71/611: {using printing deposition, e.g. ink jet printing}
- H10K 85/1135: {Polyethylene dioxythiophene [PEDOT]; Derivatives thereof}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 2102/3026: {Top emission}
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A manufacturing method of a top emission organic EL element includes a step of providing an insulating layer on a substrate, a processing step of processing a center area within a region in which the insulating layer is provided, a step of forming a bank on the insulating layer, a lower electrode material applying step, a luminescent material applying step, and an upper transparent electrode forming step. The insulating layer is provided such that a contact angle to a solution to be applied in forming a lower electrode becomes smaller at the center area than the contact angle at a peripheral area within the region.

## Claims

### Claim 1

A manufacturing method of a top emission organic EL element, comprising:
a step of providing an insulating layer on a substrate;
a processing step of processing a center area within a region in which the insulating layer is provided such that a contact angle to a solution to be applied in forming a lower electrode becomes smaller at the center area than at a peripheral area of the center area within the region;
a step of forming a bank on the insulating layer so as to surround the center area with the peripheral area interposed between the bank and the center area;
a lower electrode material applying step of applying a solution containing materials of the lower electrode to a region surrounded by the bank;
a luminescent material applying step of applying a solution containing materials of a light emitting layer to the region surrounded by the bank after the lower electrode material applying step; and
an upper transparent electrode forming step of forming an upper transparent electrode after the luminescent material applying step.

### Claim 2 (depends on 1)

The manufacturing method of the top emission organic EL element according to claim 1, wherein the processing step is a step of processing such that a difference of the contact angles to the solution at the peripheral area and at the center area becomes more than 30° and less than 70°.

### Claim 3 (depends on 1)

The manufacturing method of the top emission organic EL element according to claim 1, wherein the step of providing the insulating layer is a step of providing the insulating layer so as to cover a driving transistor formed on the substrate.

### Claim 4 (depends on 1)

The manufacturing method of the top emission organic EL element according to claim 1, wherein the processing step is a step of disposing a metal portion at the center area of the region surrounded by the bank.

### Claim 5 (depends on 4)

The manufacturing method of the top emission organic EL element according to claim 4, wherein the metal portion contains at least one of W, Al, Ti, Mo, Ta and an alloy thereof.

### Claim 6 (depends on 1)

The manufacturing method of the top emission organic EL element according to claim 1, wherein the processing step is a step of forming a plug for electrically connecting the lower electrode with a driving transistor.

### Claim 7 (depends on 1)

The manufacturing method of the top emission organic EL element according to claim 1, wherein the processing step is a step of roughening the insulating layer of the center area.

### Claim 8 (depends on 7)

The manufacturing method of the top emission organic EL element according to claim 7, wherein the processing step is a step of processing the insulating layer of the center area to be more than 30 nm and less than 100 nm in terms of arithmetic mean roughness Ra.

### Claim 9

A top emission organic EL element comprising a lower electrode, a light emitting layer, a bank surrounding the lower electrode and the light emitting layer, and an upper transparent electrode, wherein
a base of the lower electrode is what a contact angle to a coating solution to be applied in forming the lower electrode is smaller at the center area than at a peripheral area.

### Claim 10 (depends on 9)

The top emission organic EL element according to claim 9, wherein the base is an insulating layer, and the center area is a roughened surface whose flatness is lower than that of the peripheral area.

### Claim 11 (depends on 9)

The top emission organic EL element according to claim 9, wherein the base comprises a metal layer at the center area and an insulating layer at the peripheral area.

### Claim 12 (depends on 9)

The top emission organic EL element according to claim 9, wherein the lower electrode is electrically connected with a driving transistor.

### Claim 13 (depends on 9)

The top emission organic EL element according to claim 9, wherein the base comprises an insulating layer covering a driving transistor.

### Claim 14 (depends on 9)

The top emission organic EL element according to claim 9, further comprising an intermediate layer between the lower electrode and the upper transparent electrode.

### Claim 15 (depends on 14)

The top emission organic EL element according to claim 14, wherein the intermediate layer comprises a hole injection layer disposed between the light emitting layer and the upper transparent electrode.

### Claim 16 (depends on 9)

A top emission organic EL device comprising a plurality of the top emission organic EL elements according to claim 9 on a common substrate, wherein upper transparent electrodes of the plurality of the top emission organic EL elements are electrically connected with each other.

### Claim 17 (depends on 9)

A top emission organic EL device comprising a plurality of the top emission organic EL elements according to claim 9 on a common substrate, wherein one of the plurality of the top emission organic EL elements has a different luminescent color from another top emission organic EL element.