US 12,302,685 B2
Light-emitting device, light-emitting apparatus, electronic device, and lighting device
Satoshi Seo, Kanagawa (JP); Hiromi Seo, Kanagawa (JP); Kunihiko Suzuki, Kanagawa (JP); Kanta Abe, Kanagawa (JP); Yuji Iwaki, Kanagawa (JP); Naoaki Hashimoto, Kanagawa (JP); and Tsunenori Suzuki, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Apr. 25, 2024, as Appl. No. 18/645,743.
Application 18/645,743 is a continuation of application No. 17/974,143, filed on Oct. 26, 2022, granted, now 11,974,447.
Application 17/974,143 is a continuation of application No. 16/897,709, filed on Jun. 10, 2020, granted, now 11,489,133, issued on Nov. 1, 2022.
Claims priority of application No. 2019-110831 (JP), filed on Jun. 14, 2019.
Prior Publication US 2024/0292648 A1, Aug. 29, 2024
Int. Cl. H10K 50/16 (2023.01); H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/17 (2023.01); H10K 50/81 (2023.01); H10K 50/82 (2023.01); H10K 59/00 (2023.01); H10K 85/00 (2023.01); H10K 85/30 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/16 (2023.02) [H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/171 (2023.02); H10K 50/81 (2023.02); H10K 50/82 (2023.02); H10K 59/00 (2023.02); H10K 85/321 (2023.02); H10K 2101/40 (2023.02)] 18 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer includes a light-emitting layer and an electron-transport layer,
wherein the electron-transport layer is positioned between the light-emitting layer and the cathode,
wherein the electron-transport layer comprises a first material having a first resistance in a state where no current is flowing between the anode and the cathode and a second resistance in a state where a current is flowing between the anode and the cathode,
wherein the first resistance is higher than the second resistance,
wherein the first material comprises an organic compound having an electron-transport property and an organometallic complex of an alkali metal or an alkaline earth metal,
wherein the organic compound having an electron-transport property comprises an anthracene skeleton and a heterocyclic skeleton, and
wherein the organometallic complex of an alkali metal or an alkaline earth metal comprises a ligand containing nitrogen and oxygen.
 
2. A light-emitting device comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer includes a light-emitting layer and an electron-transport layer,
wherein the electron-transport layer is positioned between the light-emitting layer and the cathode,
wherein the electron-transport layer comprises a first material having a first resistance in a state where no current is flowing between the anode and the cathode and a second resistance in a state where a current is flowing between the anode and the cathode,
wherein the first resistance is higher than the second resistance,
wherein the first material comprises an organic compound having an electron-transport property and an organometallic complex of an alkali metal or an alkaline earth metal,
wherein the organic compound having an electron-transport property comprises an anthracene skeleton and a nitrogen-containing five-membered ring skeleton, and
wherein the organometallic complex of an alkali metal or an alkaline earth metal comprises a ligand containing nitrogen and oxygen.
 
3. A light-emitting device comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer includes a light-emitting layer and an electron-transport layer,
wherein the electron-transport layer is positioned between the light-emitting layer and the cathode,
wherein the electron-transport layer comprises a first material having a first resistance in a state where no current is flowing between the anode and the cathode and a second resistance in a state where a current is flowing between the anode and the cathode,
wherein the first resistance is higher than the second resistance,
wherein the first material comprises an organic compound having an electron-transport property and an organometallic complex of an alkali metal or an alkaline earth metal,
wherein the organic compound having an electron-transport property comprises an anthracene skeleton and a nitrogen-containing five-membered ring skeleton including two heteroatoms in a ring, and
wherein the organometallic complex of an alkali metal or an alkaline earth metal comprises a monovalent metal ion and a ligand having an 8-hydroxyquinolinato structure.