# US 2020/0403173 A1 · Organic light emitting element, and display apparatus, image pickup apparatus, illumination apparatus, and moving object including the same

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- Number: US 2020/0403173 A1
- Document ID: US20200403173A1
- Status: Published application
- Kind: A1
- Application number: 16/900,763
- Filed: 2020-06-12
- Published: 2020-12-24
- Earliest claimed: 2019-06-20
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Hirokazu Miyashita; Itaru Takaya; Naoki Yamada; Isao Kawata; Yuto Ito; Jun Kamatani
- Web page: https://patentgrep.com/patent/US20200403173A1

## CPC

- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H10K 50/13: comprising stacked EL layers within one EL unit
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/65: OLEDs integrated with inorganic image sensors
- H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light emitting element includes, in sequence, an anode, a first light emitting layer, a second light emitting layer, and a cathode. The first light emitting layer includes a first compound and a first light emitting material. The second light emitting layer includes a second compound and a second light emitting material having an energy gap different from an energy gap of the first light emitting material. The organic light emitting element satisfies relations (a) to (c). LUMO(H1)>LUMO(D1) (a) LUMO(H2)>LUMO(D2) (b) LUMO(H2)−LUMO(D2)>LUMO(H1)−LUMO(D1) (c) Where LUMO (H1), LUMO (D1), LUMO (H2), and LUMO (D2) represent a LUMO level of the first compound, a LUMO level of the first light emitting material, a LUMO level of the second compound, and a LUMO level of the second light emitting material, respectively.

## Claims

### Claim 1

An organic light emitting element comprising, in sequence:
an anode;
a first light emitting layer;
a second light emitting layer; and
a cathode,
wherein the second light emitting layer includes a second compound and a second light emitting material,
the first light emitting layer includes a first compound, a first light emitting material having an energy gap different from that of the second light emitting material, and a third light emitting material having an energy gap smaller than that of the first light emitting material, and
the organic light emitting element satisfies relations (a) to (d):
LUMO(H1)>LUMO(D1) (a)
LUMO(H2)>LUMO(D2) (b)
LUMO(H2)−LUMO(D2)>LUMO(H1)−LUMO(D1) (c)
LUMO(H3)>LUMO(D3) (d)
where LUMO (H1), LUMO (D1), LUMO (H2), LUMO (D2), and LUMO (D3) represent a lowest unoccupied molecular orbital (LUMO) level of the first compound, a LUMO level of the first light emitting material, a LUMO level of the second compound, a LUMO level of the second light emitting material, and a LUMO energy of the third light emitting material, respectively.

### Claim 2 (depends on 1)

The organic light emitting element according to claim 1, wherein the second light emitting material has a smaller energy gap than the first light emitting material.

### Claim 3 (depends on 1)

The organic light emitting element according to claim 1, wherein the first light emitting layer and the second light emitting layer are in contact with each other.

### Claim 4 (depends on 1)

The organic light emitting element according to claim 1, wherein the first light emitting material and the second light emitting material satisfy relation (e):
LUMO(D1)>LUMO(D2) (e)

### Claim 5 (depends on 1)

The organic light emitting element according to claim 1, wherein the first compound and the first light emitting material satisfy relation (g):
LUMO(H1)−LUMO(D1)>HOMO(D1)−HOMO(H1) (g)
where HOMO (H1) represents a highest occupied molecular orbital (HOMO) level of the first compound and HOMO (D1) represents a HOMO level of the first light emitting material.

### Claim 6 (depends on 1)

The organic light emitting element according to claim 1, wherein the second compound and the second light emitting material satisfy relation (h):
HOMO(H2)>HOMO(D2) (h)
where HOMO (H2) represents a highest occupied molecular orbital (HOMO) level of the second compound and HOMO (D2) represents a HOMO level of the second light emitting material.

### Claim 7 (depends on 1)

The organic light emitting element according to claim 1, wherein in the first light emitting layer, a weight percentage of the first compound is higher than a weight percentage of the first light emitting material, and in the second light emitting layer, a weight percentage of the second compound is higher than a weight percentage of the second light emitting material.

### Claim 8 (depends on 1)

The organic light emitting element according to claim 1, wherein the second light emitting material is a compound that emits blue light.

### Claim 9 (depends on 1)

The organic light emitting element according to claim 1, wherein the second light emitting material is a compound that emits blue light, and the first light emitting material and the third light emitting material are each a compound that emits green light or a compound that emits red light.

### Claim 10 (depends on 1)

The organic light emitting element according to claim 1, wherein the organic light emitting element emits white light.

### Claim 11 (depends on 1)

The organic light emitting element according to claim 1, wherein the first compound and the second compound are each a compound consisting of a hydrocarbon.

### Claim 12 (depends on 1)

The organic light emitting element according to claim 1, wherein the first light emitting material and the second light emitting material are each a compound having a fluoranthene skeleton.

### Claim 13 (depends on 1)

The organic light emitting element according to claim 1, wherein the second light emitting material is a compound having two or more electron-withdrawing substituents.

### Claim 14

An organic light emitting element comprising, in sequence:
an anode;
a third light emitting layer;
a first light emitting layer;
a second light emitting layer; and
a cathode,
wherein the second light emitting layer includes a second compound and a second light emitting material,
the first light emitting layer includes a first compound and a first light emitting material having an energy gap different from that of the second light emitting material,
the third light emitting layer includes a third compound and a third light emitting material having an energy gap smaller than that of the first light emitting material, and
the organic light emitting element satisfies relations (a) to (d):
LUMO(H1)>LUMO(D1) (a)
LUMO(H2)>LUMO(D2) (b)
LUMO(H2)−LUMO(D2)>LUMO(H1)−LUMO(D1) (c)
LUMO(H3)>LUMO(D3) (d)
where LUMO (H1), LUMO (D1), LUMO (H2), LUMO (D2), LUMO (H3), and LUMO (D3) represent a lowest unoccupied molecular orbital (LUMO) level of the first compound, a LUMO level of the first light emitting material, a LUMO level of the second compound, a LUMO level of the second light emitting material, a LUMO energy of the third compound, and a LUMO energy of the third light emitting material, respectively.

### Claim 15 (depends on 14)

The organic light emitting element according to claim 14, wherein the second light emitting material is a compound that emits blue light, the first light emitting material is a compound that emits green light, and the third light emitting material is a compound that emits red light.

### Claim 16 (depends on 1)

A display apparatus comprising a plurality of pixels,
wherein at least one of the plurality of pixels includes the organic light emitting element according to claim 1 and a transistor connected to the organic light emitting element.

### Claim 17 (depends on 1)

An image pickup apparatus comprising:
an optical unit including a plurality of lenses;
an image pickup element configured to receive light that has passed through the optical unit; and
a display unit configured to display an image captured by the image pickup element,
wherein the display unit includes the organic light emitting element according to claim 1.

### Claim 18 (depends on 1)

An illumination apparatus comprising:
a light source including the organic light emitting element according to claim 1; and
a light diffusion unit or an optical film configured to transmit light emitted from the light source.

### Claim 19 (depends on 1)

A moving object comprising:
a lighting fixture including the organic light emitting element according to claim 1; and
a body provided with the lighting fixture.