# US 12,120,900 B2 · Light-emitting device, light-emitting apparatus, electronic device, and lighting device

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- Number: US 12,120,900 B2
- Document ID: US12120900B2
- Status: Granted
- Kind: B2
- Application number: 17/274,514
- Filed: 2019-08-27
- Published: 2021-11-04
- Granted: 2024-10-15
- Earliest claimed: 2018-09-14
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Satoshi Seo
- Web page: https://patentgrep.com/patent/US12120900B2

## CPC

- C07D 403/10: linked by a carbon chain containing aromatic rings
- H10K 50/11: characterised by the electroluminescent [EL] layers
- C07D 403/14: containing three or more hetero rings
- C07D 409/10: linked by a carbon chain containing aromatic rings
- C07D 491/048: the oxygen-containing ring being five-membered
- C09K 11/06: containing organic luminescent materials
- 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}
- H10K 50/12: comprising dopants
- H10K 85/342: {comprising iridium}
- H10K 85/361: {Polynuclear complexes, i.e. complexes comprising two or more metal centers}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene}
- H10K 2101/10: Triplet emission
- H10K 2101/20: Delayed fluorescence emission
- 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
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

To provide a light-emitting device not only including a light-emitting layer in which energy is efficiently transferred from a host material to a guest material but also having high reliability. The light-emitting device not only includes a light-emitting layer in which the T1 levels and the S1 levels of a host material and a guest material fall within certain ranges so that energy can be efficiently transferred from the host material to the guest material and but also has improved reliability.

## Claims

### Claim 1

A light-emitting device comprising:
an EL layer between a pair of electrodes,
wherein the EL layer includes a light-emitting layer,
wherein the light-emitting layer contains a first organic compound, a second organic compound, and a light-emitting substance,
wherein a T1 level (TD(edge)) and a T1 level (TH(edge)) satisfy Formula (1):
0.07 eV≤TH(edge)−TD(edge)≤0.27 eV (1),
wherein a difference between an S1 level (S′H(edge)) and the T1 level (TH(edge)) satisfies Formula (2):
0.2 eV≤S′H(edge)−TH(edge)≤0.5 eV (2)
wherein the T1 level (TH(edge)) represents the lower of T1 levels derived from emission edges on a short wavelength side of phosphorescent spectra of the first organic compound and the second organic compound,
wherein the T1 level (TD(edge)) represents a T1 level derived from an absorption edge of an absorption spectrum of the light-emitting substance, and
wherein the S1 level (S′H(edge)) represents an S1 level derived from an emission edge on a short wavelength side of a fluorescent spectrum of a mixed material of the first organic compound and the second organic compound.

### Claim 2

A light-emitting device comprising:
an EL layer between a pair of electrodes,
wherein the EL layer includes a light-emitting layer,
wherein the light-emitting layer contains a first organic compound, a second organic compound, and a light-emitting substance,
wherein a T1 level (TD(edge)) and a T1 level (TH(edge)) satisfy Formula (3):
0.07 eV≤TH(edge)−TD(edge)≤0.17 eV (3)
wherein a difference between an S1 level (S′H(edge)) and the T1 level (TH(edge)) satisfies Formula (4):
0.2 eV≤S′H(edge)−TH(edge)≤0.5 eV (4)
wherein the T1 level (TH(edge)) represents the lower of T1 levels derived from emission edges on a short wavelength side of phosphorescent spectra of the first organic compound and the second organic compound,
wherein the T1 level (TD(edge)) represents a T1 level derived from an absorption edge of an absorption spectrum of the light-emitting substance, and
wherein the S1 level (S′H(edge)) represents an S1 level derived from an emission edge on a short wavelength side of a fluorescent spectrum of a mixed material of the first organic compound and the second organic compound.

### Claim 3 (depends on 1)

The light-emitting device according to claim 1,
wherein the first organic compound and the second organic compound form an exciplex in combination, and
wherein the S1 level (S′H(edge)) is derived from an emission edge on a short wavelength side of a fluorescent spectrum of the exciplex.

### Claim 4 (depends on 1)

The light-emitting device according to claim 1, wherein the first organic compound is a π-electron deficient heteroaromatic compound.

### Claim 5 (depends on 1)

The light-emitting device according to claim 1,
wherein the first organic compound has a pyridine ring structure, a diazine ring structure, or a triazine ring structure.

### Claim 6 (depends on 1)

The light-emitting device according to claim 1,
wherein the first organic compound has a structure where an aromatic ring is fused to a furan ring of a furodiazine skeleton.

### Claim 7 (depends on 1)

The light-emitting device according to claim 1,
wherein the light-emitting substance is a phosphorescent substance.

### Claim 8 (depends on 1)

The light-emitting device according to claim 1,
wherein the second organic compound is a carbazole derivative.

### Claim 9 (depends on 8)

The light-emitting device according to claim 8,
wherein the carbazole derivative is a bicarbazole derivative.

### Claim 10 (depends on 8)

The light-emitting device according to claim 8,
wherein the carbazole derivative is a 3,3′-bicarbazole derivative.

### Claim 11 (depends on 1)

A light-emitting apparatus comprising:
the light-emitting device according to claim 1; and
an FPC.

### Claim 12 (depends on 11)

An electronic device comprising:
the light-emitting apparatus according to claim 11; and
at least one of a microphone, a camera, an operation button, an external connection portion, and a speaker.

### Claim 13 (depends on 1)

A lighting device comprising:
the light-emitting device according to claim 1; and
at least one of a housing and a cover.

### Claim 14 (depends on 2)

The light-emitting device according to claim 2,
wherein the first organic compound and the second organic compound form an exciplex in combination, and
wherein the S1 level (S′H(edge)) is derived from an emission edge on a short wavelength side of a fluorescent spectrum of the exciplex.

### Claim 15 (depends on 2)

The light-emitting device according to claim 2, wherein the first organic compound is a π-electron deficient heteroaromatic compound.

### Claim 16 (depends on 2)

The light-emitting device according to claim 2,
wherein the first organic compound has a pyridine ring structure, a diazine ring structure, or a triazine ring structure.

### Claim 17 (depends on 2)

The light-emitting device according to claim 2,
wherein the first organic compound has a structure where an aromatic ring is fused to a furan ring of a furodiazine skeleton.

### Claim 18 (depends on 2)

The light-emitting device according to claim 2,
wherein the light-emitting substance is a phosphorescent substance.

### Claim 19 (depends on 2)

The light-emitting device according to claim 2,
wherein the second organic compound is a carbazole derivative.

### Claim 20 (depends on 19)

The light-emitting device according to claim 19,
wherein the carbazole derivative is a bicarbazole derivative.

### Claim 21 (depends on 19)

The light-emitting device according to claim 19,
wherein the carbazole derivative is a 3,3′-bicarbazole derivative.