US 11,778,908 B2 · Organic electroluminescent devices

Abstract

The present disclosure relates to display technologies, and particularly discloses an organic electroluminescent device. This organic electroluminescent device includes a light-emitting layer, the light-emitting includes an exciplex composed of a donor molecule and an acceptor molecule, and a wide band gap material for increasing the inter-molecular spacing between the donor molecule and the acceptor molecule. According to the device of the present disclosure, the degree of orbital overlap of HOMO and LUMO of the formed exciplex and the singlet-triplet energy level difference can be reduced, the reverse intersystem crossing rate (kRISC) of the exciplex host can be increased, the Föster energy transferred to the guest molecule can be enhanced, and the efficiency and the lifetime of the device can be improved.

Claims20

Dependent claims

An organic electroluminescent device, comprising:

a light-emitting layer, the light-emitting layer comprising a host material and a guest material, the host material comprising a wide band gap material and an exciplex, the exciplex composed of and formed by a donor molecule and an acceptor molecule,
wherein the wide band gap material is a compound containing a carbazolyl and an aryl,
wherein the guest material is a fluorescent doping dye,
wherein the donor molecule is a compound having hole transport property,
wherein the acceptor molecule is a compound having electron transport property,
wherein a mass ratio of the wide band gap material to the exciplex is between 1:19 to 4:1, and
wherein in the exciplex, a mass ratio of the donor molecule to the acceptor molecule is between 1:9 and 9:1.

4 more elements

Dependencies are inferred from the claim text.

Organic electroluminescent devices

Life of this patent

Organic electroluminescent devices

Life of this patent

Abstract

Claims20