# US 2021/0242419 A1 · Organic electroluminescent element and electronic device

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- Number: US 2021/0242419 A1
- Document ID: US20210242419A1
- Status: Published application
- Kind: A1
- Application number: 15/734,761
- Filed: 2019-06-04
- Published: 2021-08-05
- Earliest claimed: 2018-06-04
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co.,Ltd.
- Inventors: Masato NAKAMURA; Emiko KAMBE; Hiroaki TOYOSHIMA; Kazuki NISHIMURA; Hitoshi KUMA
- Web page: https://patentgrep.com/patent/US20210242419A1

## CPC

- H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths
- H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces
- H05B 33/26: characterised by the composition or arrangement of the conductive material used as an electrode
- H10K 50/15: Hole transporting layers
- H10K 50/19: Tandem OLEDs
- H10K 50/818: Reflective anodes, e.g. ITO combined with thick metallic layers
- H10K 50/156: {comprising a multilayered structure}
- H10K 2101/10: Triplet emission
- H10K 2101/27: {Combination of fluorescent and phosphorescent emission}
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

An organic electroluminescence device includes a first emitting unit, a first charge generating layer, a second emitting unit, a second charge generating layer, and a third emitting unit provided between an anode and a cathode in this order from the anode, in which the second charge generating layer includes an N layer close to the anode and a P layer close to the cathode, the third emitting layer contains a blue fluorescent compound, at least one of the first or second emitting layer contains a blue fluorescent compound, the third emitting unit includes a hole transporting zone between the second charge generating layer and the third emitting layer, the hole transporting zone is in contact with the second charge generating layer, and a thickness of the hole transporting zone is in a range from 5 nm to 40 nm and smaller than a thickness of the N layer.

## Claims

### Claim 1

An organic electroluminescence device comprising:
an anode;
a cathode;
a first emitting unit comprising a first emitting layer;
a first charge generating layer;
a second emitting unit comprising a second emitting layer;
a second charge generating layer; and
a third emitting unit comprising a third emitting layer, wherein
the first emitting unit, the first charge generating layer, the second emitting unit, the second charge generating layer, and the third emitting unit are provided between the anode and the cathode in this order from the anode,
the second charge generating layer comprises an N layer close to the anode and a P layer close to the cathode,
the third emitting layer comprises a blue fluorescent compound,
at least one of the first emitting layer or the second emitting layer comprises a blue fluorescent compound,
the third emitting unit further comprises a hole transporting zone of the third emitting unit between the second charge generating layer and the third emitting layer,
the hole transporting zone of the third emitting unit is in contact with the second charge generating layer, and
a thickness of the hole transporting zone of the third emitting unit is in a range from 5 nm to 40 nm and smaller than a thickness of the N layer.

### Claim 2 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
one of the anode and the cathode is a reflective electrode, and
the organic electroluminescence device satisfies numerical formulae (1-3) and (2-3),
n3−0.25<m3<n3+0.25 (1-3)
in the numerical formula (1-3), n3 represents an integer of 0 or more, and m3 represents an order of interference between the reflective electrode and a light emission center of the third emitting layer,
m
3
=
2
⁢
L
3
λ
3
+
Φ
3
2
⁢
π
(
2
⁢
-
⁢
3
)
in the formula (2-3), m3 represents the same as m3 in the numerical formula (1-3), L3 represents an optical distance (nm) between the reflective electrode and the light emission center of the third emitting layer, λ3 represents a main peak wavelength (nm) of light emission from the third emitting layer, and Φ3 represents a phase change occurring when the light emission from the third emitting layer is reflected on the reflective electrode.

### Claim 3 (depends on 2)

The organic electroluminescence device according to claim 2, wherein
n3 represents an integer from 0 to 3 in the formula (1-3).

### Claim 4 (depends on 2)

The organic electroluminescence device according to claim 2, wherein
the organic electroluminescence device further satisfies numerical formulae (1-2) and (2-2),
n2−0.25<m2<n2+0.25 (1-2)
in the numerical formula (1-2), n2 represents an integer of 0 or more, and m2 represents an order of interference between the reflective electrode and a light emission center of the second emitting layer,
m
2
=
2
⁢
L
2
λ
2
+
Φ
2
2
⁢
π
(
2
⁢
-
⁢
2
)
in the formula (2-2), m2 represents the same as m2 in the numerical formula (1-2), L2 represents an optical distance (nm) between the reflective electrode and the light emission center of the second emitting layer, λ2 represents a main peak wavelength (nm) of light emission from the second emitting layer, and Φ2 represents a phase change occurring when the light emission from the second emitting layer is reflected on the reflective electrode.

### Claim 5 (depends on 4)

The organic electroluminescence device according to claim 4, wherein
n2 represents an integer from 0 to 3 in the formula (1-2).

### Claim 6 (depends on 2)

The organic electroluminescence device according to claim 2, wherein
the organic electroluminescence device further satisfies numerical formulae (1-1) and (2-1),
n1−0.25<m1<n1+0.25 (1-1)
in the numerical formula (1-1), n1 represents an integer of 0 or more, and m1 represents an order of interference between the reflective electrode and a light emission center of the first emitting layer,
m
1
=
2
⁢
L
1
λ
1
+
Φ
1
2
⁢
π
(
2
⁢
-
⁢
1
)
in the formula (2-1), m1 represents the same as m1 in the numerical formula (1-1), L1 represents an optical distance (nm) between the reflective electrode and the light emission center of the first emitting layer, λ1 represents a main peak wavelength (nm) of light emission from the first emitting layer, and Φ1 represents a phase change occurring when the light emission from the first emitting layer is reflected on the reflective electrode.

### Claim 7 (depends on 6)

The organic electroluminescence device according to claim 6, wherein
n1 represents an integer from 0 to 3 in the formula (1-1).

### Claim 8 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
a main peak wavelength of the light emission from the third emitting layer is in a range from 430 nm to 500 nm.

### Claim 9 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the thickness of the N layer is 40 nm or more.

### Claim 10 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the hole transporting zone of the third emitting unit comprises two or more layers.

### Claim 11 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the second emitting unit further comprises a hole transporting zone of the second emitting unit between the first charge generating layer and the second emitting layer,
the hole transporting zone of the second emitting unit is in contact with the first charge generating layer, and
a thickness of the hole transporting zone of the second emitting unit is in a range from 5 nm to 40 nm.

### Claim 12 (depends on 11)

The organic electroluminescence device according to claim 11, wherein
the hole transporting zone of the second emitting unit comprises two or more layers.

### Claim 13 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the second emitting layer comprises a blue fluorescent compound.

### Claim 14 (depends on 13)

The organic electroluminescence device according to claim 13, wherein
a main peak wavelength of the light emission from the second emitting layer is in a range from 430 nm to 500 nm.

### Claim 15 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the first emitting unit further comprises a hole transporting zone of the first emitting unit between the anode and the first emitting layer,
the hole transporting zone of the first emitting unit is in contact with the anode, and
a thickness of the hole transporting zone of the first emitting unit is in a range from 5 nm to 40 nm.

### Claim 16 (depends on 15)

The organic electroluminescence device according to claim 15, wherein
the hole transporting zone of the first emitting unit comprises three or more layers.

### Claim 17 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the first emitting layer comprises a blue fluorescent compound.

### Claim 18 (depends on 17)

The organic electroluminescence device according to claim 17, wherein
a main peak wavelength of the light emission from the first emitting layer is in a range from 430 nm to 500 nm.

### Claim 19 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the anode is a reflective electrode and light is extracted through the cathode.

### Claim 20 (depends on 1)

The organic electroluminescence device according to claim 1, wherein
the cathode is a reflective electrode and light is extracted through the anode.

### Claim 21 (depends on 1)

An electronic device comprising the organic electroluminescence device according to claim 1.