# US 2025/0098401 A1 · Light-emitting device and electronic apparatus including the same

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- Number: US 2025/0098401 A1
- Document ID: US20250098401A1
- Status: Published application
- Kind: A1
- Application number: 18/615,736
- Filed: 2024-03-25
- Published: 2025-03-20
- Earliest claimed: 2023-09-14
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jongwon Lee; Hakchoong Lee; Kayoung Lee; Changmin Lee; Jaehoon Hwang
- Web page: https://patentgrep.com/patent/US20250098401A1

## CPC

- H10K 50/13: comprising stacked EL layers within one EL unit
- H10K 50/12: comprising dopants
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/171: {Electron injection layers}
- H10K 50/19: Tandem OLEDs
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Provided is a light-emitting device including a first electrode, a second electrode facing the first electrode, and an interlayer arranged between the first electrode and the second electrode. The interlayer includes emission layers, charge generation layers arranged between emission layers, and a layer including an alkali metal and Yb.

## Claims

### Claim 1

A light-emitting device comprising:
a first electrode;
a second electrode facing the first electrode; and
an interlayer arranged between the first electrode and the second electrode, wherein
the interlayer comprises:
m emission layers;
m−1 charge generation layers arranged between two adjacent ones of the m emission layers; and
a layer comprising an alkali metal and Yb, and
m is an integer of 2 or more.

### Claim 2 (depends on 1)

The light-emitting device of claim 1, wherein the alkali metal comprises Li, Na, K, Rb, Cs, Fr, or a combination thereof.

### Claim 3 (depends on 1)

The light-emitting device of claim 1, wherein
the first electrode is an anode,
the second electrode is a cathode, and
the interlayer further comprises a hole transport region arranged between the first electrode and the m emission layers and comprising a hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof.

### Claim 4 (depends on 1)

The light-emitting device of claim 1, wherein
the first electrode is an anode,
the second electrode is a cathode,
the interlayer further comprises an electron transport region arranged between the second electrode and the m emission layers and comprising an electron injection layer, and a hole blocking layer, an electron transport layer, or a combination thereof, and
the electron transport region comprises the layer comprising an alkali metal and Yb.

### Claim 5 (depends on 1)

The light-emitting device of claim 1, wherein a volume ratio of the alkali metal to Yb is in a range of about 1:9 to about 9:1.

### Claim 6 (depends on 1)

The light-emitting device of claim 1, wherein a thickness of the layer comprising an alkali metal and Yb is about 30 Å or less.

### Claim 7 (depends on 1)

The light-emitting device of claim 1, wherein the layer comprising an alkali metal and Yb is in direct contact with the first electrode or the second electrode.

### Claim 8 (depends on 1)

The light-emitting device of claim 1, wherein
the first electrode is an anode,
the second electrode is a cathode, and
the layer comprising an alkali metal and Yb is in direct contact with the second electrode.

### Claim 9 (depends on 1)

The light-emitting device of claim 1, wherein the layer comprising an alkali metal and Yb consists of the alkali metal and Yb.

### Claim 10 (depends on 1)

The light-emitting device of claim 1, wherein
m is an integer of 4 or more, and
the interlayer comprises a blue emission layer and a green emission layer.

### Claim 11 (depends on 10)

The light-emitting device of claim 10, wherein the blue emission layer comprises a fluorescent dopant.

### Claim 12 (depends on 10)

The light-emitting device of claim 10, wherein the green emission layer comprises a phosphorescent dopant.

### Claim 13 (depends on 1)

The light-emitting device of claim 1, wherein each of the m−1 charge generation layers comprises an n-type charge generation layer and a p-type charge generation layer.

### Claim 14 (depends on 10)

The light-emitting device of claim 10, wherein the green emission layer is closer to the layer comprising an alkali metal and Yb than the blue emission layer.

### Claim 15 (depends on 10)

The light-emitting device of claim 10, wherein
the first electrode is an anode,
the second electrode is a cathode, and
the second electrode comprises Ag and an alkali earth metal.

### Claim 16 (depends on 15)

The light-emitting device of claim 15, wherein the alkali earth metal comprises Be, Mg, Ca, Sr, Ba, Ra, or a combination thereof.

### Claim 17 (depends on 1)

An electronic apparatus comprising the light-emitting device of claim 1.

### Claim 18 (depends on 17)

The electronic apparatus of claim 17, wherein the electronic apparatus comprises a display, a light source, a lighting, a personal computer, a mobile phone, a digital camera, an electronic organizer, an electronic dictionary, an electronic game machine, a medical instrument, a fish finder, a measuring instrument, a meter, or a projector.

### Claim 19 (depends on 17)

The electronic apparatus of claim 17, further comprising:
a thin-film transistor, wherein
the thin-film transistor comprises a source electrode and a drain electrode, and
the first electrode of the light-emitting device is electrically connected to at least one of the source electrode and the drain electrode of the thin-film transistor.

### Claim 20 (depends on 19)

The electronic apparatus of claim 19, further comprising:
a color filter,
wherein the color filter comprises quantum dots.