US 11,778,902 B2 · Organic electroluminescent devices

Abstract

The present disclosure relates to the field of display technologies, and particularly discloses an organic electroluminescent device. The organic electroluminescent device has a first electrode, a second electrode, and an organic functional layer. The organic functional layer comprises a light-emitting layer. The light-emitting layer comprises at least a host material and a guest material. The host material comprises an exciplex composed of a donor molecule and a receptor molecule, wherein the donor molecule and/or the receptor molecule contains a large steric hindrance substituent group X for increasing an inter-molecular distance between the donor molecule and the receptor molecule, which enables to enhance Foster energy transfer to the guest material molecule, improve device efficiency, inhibit Triplet-Polaron Annihilate Annihilation (TPA), and prolong the device lifetime.

Claims16

Dependent claims

An organic electroluminescent device, the organic electroluminescent device comprising an organic functional layer, the organic functional layer comprising a light-emitting layer;

the light-emitting layer comprising a host material and a guest material;
the host material being an exciplex composed of a donor molecule and a receptor molecule;
the donor molecule and/or the receptor molecule containing a plurality of steric hindrance groups, wherein the steric hindrance groups are groups each independently containing substituted or unsubstituted cycloalkyl, silyl, boryl and borosilicate,
wherein the donor molecule employs any one of the following structures:

1 more element

Dependencies are inferred from the claim text.

Organic electroluminescent devices

Life of this patent

Organic electroluminescent devices

Life of this patent

Abstract

Claims16