US 12,193,252 B2
Quantum dot light emitting device with electron auxiliary layer and display device including the same
Heejae Lee, Seongnam-si (KR); Sung Woo Kim, Hwaseong-si (KR); Eun Joo Jang, Suwon-si (KR); Dae Young Chung, Suwon-si (KR); and Moon Gyu Han, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Apr. 14, 2023, as Appl. No. 18/300,665.
Application 18/300,665 is a continuation of application No. 16/921,188, filed on Jul. 6, 2020, granted, now 11,659,725.
Claims priority of application No. 10-2019-0081628 (KR), filed on Jul. 5, 2019.
Prior Publication US 2023/0276643 A1, Aug. 31, 2023
Int. Cl. H10K 50/16 (2023.01); H10K 50/115 (2023.01); H10K 50/15 (2023.01); H10K 50/17 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 50/15 (2023.02); H10K 50/171 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A light emitting device, comprising:
a first electrode and a second electrode with a surface facing the first electrode;
an emission layer disposed between the first electrode and the second electrode and comprising a quantum dot; and
an electron auxiliary layer disposed between the emission layer and the second electrode,
wherein the electron auxiliary layer comprises a first layer proximate to the emission layer and comprising a plurality of nanoparticles comprising a first metal oxide, and a second layer disposed on the first layer and proximate to the second electrode, the second layer comprising a second metal oxide,
wherein the first metal oxide is represented by Chemical Formula 1:
Zn1-xMxO  Chemical Formula 1
wherein M is Mg, Ca, Zr, W, Li, Ti, Y, Al, or a combination thereof, and
x is greater than 0 and less than or equal to 0.5, and
wherein an amount of carbon in the first layer is greater than an amount of carbon in the second layer,
wherein the amount of carbon in the second layer is less than or equal to 9 mol % and greater than 0.1 mol % based on a total mole amount of elements included in the second layer.