# US 12,002,905 B2 · Light emitting element, display device including the same, and method for manufacturing the display device

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- Number: US 12,002,905 B2
- Document ID: US12002905B2
- Status: Granted
- Kind: B2
- Application number: 17/250,713
- Filed: 2019-01-03
- Published: 2021-07-01
- Granted: 2024-06-04
- Earliest claimed: 2018-08-24
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jae Hoon Jung; Sung Chan Jo
- Web page: https://patentgrep.com/patent/US12002905B2

## CPC

- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- B82B 3/0052: {Aligning two or more elements}
- C07F 5/025: {Boronic and borinic acid compounds}
- C07F 5/027: {Organoboranes and organoborohydrides}
- C07F 7/1804: {Compounds having Si-O-C linkages (Si-O-acyl linkages C07F7/1896)}
- H10D 86/40: characterised by multiple TFTs
- H10D 86/60: wherein the TFTs are in active matrices
- H10H 20/821: of the light-emitting regions, e.g. non-planar junctions
- H10H 20/831: characterised by their shape
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10K 85/658: {Organoboranes}
- H10W 90/00: Package configurations
- H10H 20/032: {of electrodes}
- H10H 20/034: {of coatings}
- H10H 20/0364: {of interconnections}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- B82B: NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A light emitting device, a display device comprising same, and a method for manufacturing a display device are provided. The light emitting device comprises: a first conductivity type semiconductor doped to have a first polarity, an active layer on the first conductivity type semiconductor, a second conductivity type semiconductor on the active layer and doped to have a second polarity different from the first polarity and an insulating material layer surrounding side surfaces of the first conductivity type semiconductor, the second conductivity type semiconductor, and the active layer, wherein the insulating material layer includes an insulating material film and an element orienter bonded to an outer peripheral surface of the insulating material film.

## Claims

### Claim 1

A light emitting element comprising:
a first conductivity type semiconductor doped to have a first polarity;
an active layer on the first conductivity type semiconductor;
a second conductivity type semiconductor on the active layer and doped to have a second polarity different from the first polarity; and
an insulating material layer surrounding side surfaces of the first conductivity type semiconductor, the second conductivity type semiconductor, and the active layer,
wherein the insulating material layer comprises an insulating material film and an element orienter bonded to an outer peripheral surface of the insulating material film.

### Claim 2 (depends on 1)

The light emitting element of claim 1, wherein the element orienter comprises a compound represented by the following chemical structural formula (1):
where X is —OR or —NR2, Y is one selected from —NR3+, —CmFi and —CN, at least one selected from L1, L2 and L3 is one selected from —Si(OR)3, —Si(OR)3, —(R)Si(OH)3, —(R)Si(OR)3, —B(OH)2, —B(OR)2, —(R)B(OR)2 and —(R)B(OR)2, the other is hydrogen (H), each R is independently one selected from hydrogen, a C1-C6 alkyl group, a C1-C6 alkenyl group and a C1-C6 alkynyl group, n is an integer of 0 to 3, and m and I are each independently an integer of 1 to 10.

### Claim 3 (depends on 2)

The light emitting element of claim 2, wherein the element orienter comprises at least one selected from compounds represented by the following chemical structural formulas (1-1) to (1-12):
where each R is independently one selected from hydrogen, a C1-C6 alkyl group, a C1-C6 alkenyl group and a C1-C6 alkynyl group, and m and I are each independently an integer of 1 to 10.

### Claim 4 (depends on 1)

The light emitting element of claim 1, wherein the element orienter comprises a compound represented by the following chemical structural formula (2):
where X is —OR or —NR2, Y is one selected from —NR3+, —CmFl and —CN, L4 is one selected from —Si(OH)3, —Si(OR)3, —(R)Si(OH)3, —(R)Si(OR)3, —B(OH)2, —B(OR)2, —(R)B(OH)2 and —(R)B(OR)2, each R is independently one selected from hydrogen, a C1-C6 alkyl group, a C1-C6 alkenyl group and a C1-C6 alkynyl group, and m and I are each an integer of 1 to 5.

### Claim 5 (depends on 4)

The light emitting element of claim 4, wherein the element orienter comprises at least one of compounds represented by the following chemical structural formulas (2-1) to (2-12):
where each R is independently one selected from hydrogen, a C1-C6 alkyl group, a C1-C6 alkenyl group and a C1-C6 alkynyl group, and m and I are each independently an integer of 1 to 10.

### Claim 6 (depends on 1)

The light emitting element of claim 1, wherein the element orienter comprises a main chain portion, a linking group bonded to the main chain portion, and a first functional group and a second functional group bonded to the main chain portion.

### Claim 7 (depends on 6)

The light emitting element of claim 6, wherein the main chain portion comprises at least one phenyl group, and the first functional group and the second functional group stabilize an intra-molecular dipole formed in the main chain portion.

### Claim 8 (depends on 7)

The light emitting element of claim 7, wherein the first functional group comprises an electron donor group, and the second functional group comprises an electron withdrawing group.

### Claim 9 (depends on 8)

The light emitting element of claim 8, wherein the linking group forms a covalent bond together with an element included in the insulating material film.

### Claim 10 (depends on 7)

The light emitting element of claim 7, wherein the linking group comprises a carbon chain comprising at least one single bond, and the element orienter is oriented in any direction.

### Claim 11 (depends on 10)

The light emitting element of claim 10, wherein the element orienter is oriented to be parallel to a direction in which the first conductivity type semiconductor, the active layer, and the second conductivity type semiconductor are sequentially stacked.

### Claim 12

A display device comprising:
a substrate;
at least one first electrode and at least one second electrode extending in a first direction on the substrate and spaced apart from each other in a second direction different from the first direction;
at least one light emitting element in a separation space between the first electrode and the second electrode;
a first contact electrode partially covering the first electrode and contacting a first end of the light emitting element; and
a second contact electrode spaced apart from the first contact electrode and partially covering the second electrode to contact a second end opposite to the first end of the light emitting element,
wherein the light emitting element comprises an element rod and an insulating material layer surrounding an outer peripheral surface of the element rod, and the insulating material layer comprises an insulating material film and an element orienter bonded to an outer peripheral surface of the insulating material film.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the element rod comprises:
a first conductivity type semiconductor doped to have a first polarity;
an active layer on the first conductivity type semiconductor; and
a second conductivity type semiconductor on the active layer and doped to have a second polarity opposite to the first polarity,
wherein the insulating material layer surrounds side surfaces of the first conductivity type semiconductor, the active layer, and the second conductivity type semiconductor.

### Claim 14 (depends on 13)

The display device of claim 13, wherein the light emitting element is aligned such that the first conductivity type semiconductor, the active layer, and the second conductivity type semiconductor are sequentially disposed in a direction parallel to the second direction between the first electrode and the second electrode.

### Claim 15 (depends on 14)

The display device of claim 14, wherein the element orienter comprises a main chain portion, a linking group bonded to the main chain portion, and a first functional group and a second functional group substituted in the main chain portion, and
the element orienter is oriented to be substantially parallel to a direction in which the first conductivity type semiconductor, the active layer, and the second conductivity type semiconductor are sequentially disposed.

### Claim 16

A method for manufacturing a display device, comprising:
providing a base substrate comprising a substrate, at least one first electrode and at least one second electrode spaced apart from each other on the substrate, and an insulating layer covering the first electrode and the second electrode;
applying a coating solution in which light emitting elements are dispersed onto the first electrode and the second electrode of the base substrate; and
aligning the light emitting elements between the first electrode and the second electrode by forming an electric field between the first electrode and the second electrode,
wherein the light emitting element comprises an element rod and an insulating material layer surrounding an outer peripheral surface of the element rod, and
the insulating material layer comprises an insulating material film and an element orienter bonded to an outer peripheral surface of the insulating material film.

### Claim 17 (depends on 16)

The method of claim 16, wherein the element rod comprises:
a first conductivity type semiconductor doped to have a first polarity;
an active layer on the first conductivity type semiconductor; and
a second conductivity type semiconductor on the active layer and doped to have a second polarity opposite to the first polarity,
wherein in the aligning of the light emitting elements, a dipole in the light emitting element is formed between the first conductivity type semiconductor and the second conductivity type semiconductor.

### Claim 18 (depends on 17)

The method of claim 17, wherein in the aligning of the light emitting elements, the element orienter is oriented such that a direction of the dipole in the light emitting element is substantially parallel to a direction of an intra-molecular dipole of the element orienter, and dielectric anisotropy of the light emitting element is increased.

### Claim 19 (depends on 18)

The method of claim 18, wherein the light emitting elements are aligned between the first electrode and the second electrode such that the first conductivity type semiconductor, the active layer, and the second conductivity type semiconductor are sequentially disposed in a direction parallel to a direction in which the first electrode and the second electrode are spaced apart from each other.