# US 2021/0242428 A1 · Organic electroluminescence element, display device, and electronic apparatus

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- Number: US 2021/0242428 A1
- Document ID: US20210242428A1
- Status: Published application
- Kind: A1
- Application number: 17/059,352
- Filed: 2019-05-28
- Published: 2021-08-05
- Earliest claimed: 2018-05-28
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co.,Ltd.
- Inventors: Kazuki NISHIMURA; Toshinari OGIWARA; Keiji OKINAKA; Keiichi YASUKAWA
- Web page: https://patentgrep.com/patent/US20210242428A1

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- G09F 9/30: in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00)
- H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces
- H05B 33/24: of metallic reflective layers (H05B33/26 takes precedence)
- H05B 33/28: of translucent electrodes
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/18: Carrier blocking layers
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 85/623: {containing five rings, e.g. pentacene}
- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2101/20: Delayed fluorescence emission
- H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
- H10K 2102/3026: {Top emission}
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

An organic electroluminescence device including: at least a first pixel and a blue pixel apposed on a substrate, in which the first pixel and the blue pixel each have an anode and a cathode, and the first pixel and the blue pixel have a first emitting layer and a blue emitting layer, respectively; a hole transporting zone provided between the first emitting layer and the anode and between the blue emitting layer and the anode; and an electron transporting zone provided between the first emitting layer and the cathode and between the blue emitting layer and the cathode, in which the first emitting layer includes a delayed fluorescent second compound and a fluorescent first compound capable of emitting light ranging from 500 nm to 660 nm, and the electron transporting zone includes: a first common layer; and an additional layer provided between the first emitting layer and the cathode.

## Claims

### Claim 1

An organic electroluminescence device comprising:
a first pixel and a blue pixel apposed on a substrate, wherein
the first pixel and the blue pixel each comprise an anode and a cathode,
the first pixel comprises a first emitting layer between the anode and the cathode, and
the blue pixel comprises a blue emitting layer between the anode and the cathode;
a hole transporting zone interposed between the first emitting layer and the anode and between the blue emitting layer and the anode; and
an electron transporting zone interposed between the first emitting layer and the cathode and between the blue emitting layer and the cathode, wherein
the first emitting layer comprises a delayed fluorescent second compound, and a fluorescent first compound capable of emitting light in a range from 500 nm to 660 nm, and
the electron transporting zone comprises: a first common layer provided in common in the first pixel and the blue pixel; and an additional layer interposed between the first emitting layer and the cathode in the first pixel.

### Claim 2 (depends on 1)

The organic electroluminescence device of claim 1, wherein
the hole transporting zone comprises a second common layer provided in common in the first pixel and the blue pixel.

### Claim 3 (depends on 1)

The organic electroluminescence device of claim 1, wherein
a lowest singlet energy S1(M2) of the second compound and a lowest singlet energy S1(M1) of the first compound satisfy a relationship of Numerical Formula 3 below,
S1(M2)>S1(M1) (Numerical Formula 3).

### Claim 4 (depends on 1)

The organic electroluminescence device of claim 1, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M1) of the first compound satisfy a relationship of Numerical Formula 4 below,
Af(M2)<Af(M1) (Numerical Formula 4).

### Claim 5 (depends on 1)

The organic electroluminescence device of claim 1, wherein
the first pixel further comprises a third compound, and
a lowest singlet energy S1(M3) of the third compound and a lowest singlet energy S1(M2) of the second compound satisfy a relationship of Numerical Formula 5 below,
S1(M3)>S1(M2) (Numerical Formula 5).

### Claim 6 (depends on 5)

The organic electroluminescence device of claim 5, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M3) of the third compound satisfy a relationship of Numerical Formula 6 below,
Af(M3)<Af(M2) (Numerical Formula 6).

### Claim 7 (depends on 1)

The organic electroluminescence device of claim 1, wherein
the anode is a reflective electrode, and
the cathode is a light transmissive electrode.

### Claim 8 (depends on 1)

A display installed with the organic electroluminescence device of claim 1.

### Claim 9 (depends on 1)

An electronic device installed with the organic electroluminescence device of claim 1.

### Claim 10

An organic electroluminescence device comprising:
a red pixel, a green pixel, and a blue pixel apposed on a substrate, wherein
the red pixel, the green pixel, and the blue pixel each comprise an anode and a cathode,
the red pixel comprises a red emitting layer between the anode and the cathode,
the green pixel comprises a green emitting layer between the anode and the cathode, and
the blue pixel comprises a blue emitting layer between the anode and the cathode;
a hole transporting zone between the red emitting layer and the anode, between the green emitting layer and the anode, and between the blue emitting layer and the anode; and
an electron transporting zone between the red emitting layer and the cathode, between the green emitting layer and the cathode, and between the blue emitting layer and the cathode, wherein
the red emitting layer comprises a delayed fluorescent second compound and a red fluorescent first compound, and
the electron transporting zone comprises: a first common layer provided in common in the red pixel, the green pixel, and the blue pixel; and an additional layer interposed between the red emitting layer and the cathode in the red pixel.

### Claim 11 (depends on 10)

The organic electroluminescence device of claim 10, wherein
the hole transporting zone comprises a second common layer provided in common in the red pixel, the green pixel, and the blue pixel.

### Claim 12 (depends on 10)

The organic electroluminescence device of claim 10, wherein
a total thickness DR of a thickness DRET of the electron transporting zone in the red pixel, a thickness DRHT of the hole transporting zone in the red pixel, and a thickness DREM of the red emitting layer, and the thickness DRET satisfy Numerical Formula 1 below,
0.15≤DRET/DR≤0.50 (Numerical Formula 1).

### Claim 13 (depends on 10)

The organic electroluminescence device of claim 10, wherein
a lowest singlet energy S1(M2) of the second compound and a lowest singlet energy S1(M) of the first compound satisfy a relationship of Numerical Formula 3 below,
S1(M2)>S1(M1) (Numerical Formula 3).

### Claim 14 (depends on 10)

The organic electroluminescence device of claim 10, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M1) of the first compound satisfy a relationship of Numerical Formula 4 below,
Af(M2)<Af(M1) (Numerical Formula 4).

### Claim 15 (depends on 10)

The organic electroluminescence device of claim 10, wherein
the red emitting layer further comprises a third compound, and
a lowest singlet energy S1(M3) of the third compound and a lowest singlet energy S1(M2) of the second compound satisfy a relationship of Numerical Formula 5 below,
S1(M3)>S1(M2) (Numerical Formula 5).

### Claim 16 (depends on 15)

The organic electroluminescence device of claim 15, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M3) of the third compound satisfy a relationship of Numerical Formula 6 below,
Af(M3)<Af(M2) (Numerical Formula 6).

### Claim 17 (depends on 10)

The organic electroluminescence device of claim 10, wherein
the anode is a reflective electrode, and
the cathode is a light transmissive electrode.

### Claim 18 (depends on 10)

A display installed with the organic electroluminescence device of claim 10.

### Claim 19 (depends on 10)

An electronic device installed with the organic electroluminescence device of claim 10.

### Claim 20

An organic electroluminescence device comprising:
a red pixel, a green pixel, and a blue pixel apposed on a substrate, wherein
the red pixel, the green pixel, and the blue pixel each comprise an anode and a cathode,
the red pixel comprises a red emitting layer between the anode and the cathode,
the green pixel comprises a green emitting layer between the anode and the cathode, and
the blue pixel comprises a blue emitting layer between the anode and the cathode;
a hole transporting zone between the red emitting layer and the anode, between the green emitting layer and the anode, and between the blue emitting layer and the anode; and
an electron transporting zone between the red emitting layer and the cathode, between the green emitting layer and the cathode, and between the blue emitting layer and the cathode, wherein
the green emitting layer comprises a delayed fluorescent second compound and a green fluorescent first compound, and
the electron transporting zone comprises: a first common layer provided in common in the red pixel, the green pixel, and the blue pixel; and an additional layer interposed between the green emitting layer and the cathode in the green pixel.

### Claim 21 (depends on 20)

The organic electroluminescence device of claim 20, wherein
the hole transporting zone comprises a second common layer provided in common in the red pixel, the green pixel, and the blue pixel.

### Claim 22 (depends on 20)

The organic electroluminescence device of claim 20, wherein
a lowest singlet energy S1(M2) of the second compound and a lowest singlet energy S1(M1) of the first compound satisfy a relationship of Numerical Formula 3 below,
S1(M2)>S1(M1) (Numerical Formula 3).

### Claim 23 (depends on 20)

The organic electroluminescence device of claim 20, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M1) of the first compound satisfy a relationship of Numerical Formula 4 below,
Af(M2)<Af(M1) (Numerical Formula 4).

### Claim 24 (depends on 20)

The organic electroluminescence device of claim 20, wherein
the green emitting layer further comprises a third compound, and
a lowest singlet energy S1(M3) of the third compound and a lowest singlet energy S1(M2) of the second compound satisfy a relationship of Numerical Formula 5 below,
S1(M3)>S1(M2) (Numerical Formula 5).

### Claim 25 (depends on 24)

The organic electroluminescence device of claim 24, wherein
an electron affinity level Af(M2) of the second compound and an electron affinity level Af(M3) of the third compound satisfy a relationship of Numerical Formula 6 below,
Af(M3)<Af(M2) (Numerical Formula 6).

### Claim 26 (depends on 20)

The organic electroluminescence device of claim 20, wherein
the anode is a reflective electrode, and
the cathode is a light transmissive electrode.

### Claim 27 (depends on 20)

A display installed with the organic electroluminescence device of claim 20.

### Claim 28 (depends on 20)

An electronic device installed with the organic electroluminescence device of claim 20.