US 12,356,790 B2
Display device and light emitting device
Tae Hyung Kim, Seoul (KR); Heejae Chung, Seoul (KR); Eun Joo Jang, Suwon-si (KR); Sujin Park, Seoul (KR); and Yuho Won, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jun. 28, 2022, as Appl. No. 17/851,211.
Claims priority of application No. 10-2021-0084197 (KR), filed on Jun. 28, 2021.
Prior Publication US 2022/0416187 A1, Dec. 29, 2022
Int. Cl. H10K 50/15 (2023.01); H10K 50/115 (2023.01); H10K 50/125 (2023.01); H10K 102/10 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 50/125 (2023.02); H10K 50/15 (2023.02); H10K 2102/101 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An electroluminescent display device comprising a blue pixel, wherein the electroluminescent display device comprises
a first electrode and a second electrode each having a surface opposite the other; and
a light emitting layer disposed between the first electrode and the second electrode,
wherein the light emitting layer comprises a blue light emitting layer disposed in the blue pixel and comprising a plurality of nanostructures, wherein the plurality of nanostructures does not comprise cadmium, wherein the blue light emitting layer is configured to exhibit an emission peak wavelength (λmax) of greater than or equal to about 445 nanometers and less than or equal to about 480 nanometers upon application of a bias voltage between the first electrode and the second electrode,
wherein during a bias voltage change from a first voltage to a second voltage, the second voltage being greater than the first voltage by at least about 5 volts, the emission peak wavelength (λmax) of the blue light emitting layer is configured to exhibit a first emission peak wavelength that is less than an emission peak wavelength at the first voltage and an emission peak wavelength at the second voltage,
wherein during the bias voltage change, a change width in the emission peak wavelength (λmax) is less than or equal to about 4 nanometers.