US 12,114,517 B2Granted

Light-emitting element and light-emitting device

AssigneeSharp Kabushiki Kaisha

InventorsMasanobu Mizusaki, Hiroshi Tsuchiya

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Abstract

In a light-emitting element, an energy level difference between a second hole transport layer and the light-emitting layer on a side closer to the second hole transport layer is greater than an energy level difference between the light-emitting layer on the side closer to the second hole transport layer and a layer in contact with a side closer to a cathode electrode of the light-emitting layer on the side closer to the second hole transport layer in LUMO level, and an energy level difference between a first electron transport layer and the light-emitting layer on a side closer to the first electron transport layer is greater than an energy level difference between the light-emitting layer on the side closer to the first electron transport layer and a layer in contact with a side closer to an anode electrode of the light-emitting layer on the side closer to the first electron transport layer in HOMO level.

Claims14

Dependent claims

A light-emitting element comprising:

an anode electrode;
a cathode electrode;
a first hole transport layer;
a second hole transport layer;
a light-emitting layer;
a first electron transport layer;
and
a second electron transport layer, wherein
the first hole transport layer, the second hole transport layer, the light-emitting layer, the first electron transport layer, and the second electron transport layer are provided between the anode electrode and the cathode electrode in order from a side closer to the anode electrode,
a value of a lowest unoccupied molecular orbital (LUMO) level of the second hole transport layer is greater than a value of a LUMO level of the light-emitting layer, and a value of a LUMO level of the light-emitting layer is equal to or greater than a value of a LUMO level of the first electron transport layer,
a value of a highest occupied molecular orbital (HOMO) level of the light-emitting layer is greater than a value of a HOMO level of the first electron transport layer,
an energy level difference between the second hole transport layer and the light-emitting layer is greater than an energy level difference between the light-emitting layer and the first electron transport layer in a LUMO level,
an energy level difference between the first electron transport layer and the light-emitting layer is greater than an energy level difference between the light-emitting layer and the second hole transport layer in a HOMO level,
the light-emitting layer is a single layer,
an energy level difference between the light-emitting layer and the first electron transport layer in the LUMO level is not less than 0.0 eV and not greater than 0.15 eV, and
an energy level difference between the light-emitting layer and the second hole transport layer in the HOMO level is not less than 0.0 eV and not greater than 0.15 eV.

13 more elements

A light-emitting element comprising:

an anode electrode;
a cathode electrode;
a first hole transport layer;
a second hole transport layer;
a light-emitting layer;
a first electron transport layer;
and
a second electron transport layer, wherein
the first hole transport layer, the second hole transport layer, the light-emitting layer, the first electron transport layer, and the second electron transport layer are provided between the anode electrode and the cathode electrode in order from a side closer to the anode electrode,
a value of a lowest unoccupied molecular orbital (LUMO) level of the second hole transport layer is greater than a value of a LUMO level of a first light-emitting layer on a side closer to the second hole transport layer, and a value of a LUMO level of a second light-emitting layer on a side closer to the first electron transport layer is equal to or greater than a value of a LUMO level of the first electron transport layer,
a value of a highest occupied molecular orbital (HOMO) level of the second light-emitting layer on the side closer to the first electron transport layer is greater than a value of a HOMO level of the first electron transport layer,
an energy level difference between the second hole transport layer and the first light-emitting layer on the side closer to the second hole transport layer is greater than an energy level difference between the first light-emitting layer on the side closer to the second hole transport layer and the second light-emitting layer on the side closer to the first electron transport layer in a LUMO level,
an energy level difference between the first electron transport layer and the second light-emitting layer on the side closer to the first electron transport layer is greater than an energy level difference between the second light-emitting layer on the sider closer the first electron transport layer and the first light-emitting layer on the side closer to the second hole transport layer in a HOMO level,
the first light-emitting layer on the side closer to the second hole transport layer and the second light-emitting layer on the side closer to the first electron transport layer are the same,
an energy level difference between the light-emitting layer and the first electron transport layer in the LUMO level is not less than 0.0 eV and not greater than 0.15 eV,
an energy level difference between the light-emitting layer and the second hole transport layer in the HOMO level is not less than 0.0 eV and not greater than 0.15 eV, and
the light-emitting layer is configured to emit red light.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/439,369Filed 22 Mar 2019
Published: US 2022/0158111 A119 May 2022
Granted: 8 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H10K 50/11
OLEDs or polymer light-emitting diodes [PLED]: characterised by the electroluminescent [EL] layers
H05B 33/14
Light sources with substantially two-dimensional [2D] radiating surfaces: characterised by the chemical or physical composition or the arrangement…
H10H 20/822
Bodies: materials of the light-emitting regions
H10K 50/156
Hole transporting layers: comprising a multilayered structure

Family

US 2022/0158111 A1Pre-grant publication · published 19 May 2022
US 12,114,517 B2This patent

From the US filing history. Foreign family members aren’t listed.

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