US 12,389,739 B2
Light-emitting device, display device, light-emitting apparatus, electronic device, and lighting device
Takeyoshi Watabe, Kanagawa (JP); Airi Ueda, Kanagawa (JP); Yuta Kawano, Kanagawa (JP); Nobuharu Ohsawa, Kanagawa (JP); and Satoshi Seo, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on Feb. 16, 2022, as Appl. No. 17/672,799.
Claims priority of application No. 2021-028509 (JP), filed on Feb. 25, 2021; application No. 2021-079545 (JP), filed on May 10, 2021; and application No. 2021-170317 (JP), filed on Oct. 18, 2021.
Prior Publication US 2022/0278292 A1, Sep. 1, 2022
Int. Cl. H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/818 (2023.01); H10K 85/00 (2023.01); H10K 59/80 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 50/13 (2023.02); H10K 50/818 (2023.02); H10K 85/00 (2023.02); H10K 59/80518 (2023.02); H10K 59/876 (2023.02); H10K 59/879 (2023.02); H10K 2101/40 (2023.02)] 26 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a first electrode;
a second electrode; and
an Electro-Luminescent (EL) layer positioned between the first electrode and the second electrode,
wherein the EL layer comprises at least a light-emitting layer, a first layer, a second layer, and a third layer,
wherein the first layer is positioned between the first electrode and the light-emitting layer,
wherein the third layer is positioned between the first layer and the light-emitting layer,
wherein the second layer is positioned between the first layer and the third layer,
wherein the first layer comprises a first organic compound,
wherein the second layer comprises a second organic compound,
wherein the third layer comprises a third organic compound,
wherein an ordinary refractive index of the second organic compound with respect to light with any of wavelengths greater than or equal to 450 nm and less than or equal to 650 nm is higher than an ordinary refractive index of the first organic compound with respect to light with any of the wavelengths and an ordinary refractive index of the third organic compound with respect to light with any of the wavelengths, and
wherein a value obtained by subtracting a Giant Surface Potential (GSP) (mV/nm) of the third layer from a GSP (mV/nm) of the first layer is less than or equal to 10 (mV/nm).