US 11,725,141 B2
Cadmium free quantum dots, and composite and display device including the same
Seonmyeong Choi, Suwon-si (KR); Eun Joo Jang, Suwon-si (KR); Hyo Sook Jang, Suwon-si (KR); and Kun Su Park, Seongnam-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Feb. 3, 2021, as Appl. No. 17/166,059.
Claims priority of application No. 10-2020-0015235 (KR), filed on Feb. 7, 2020.
Prior Publication US 2021/0246370 A1, Aug. 12, 2021
Int. Cl. C09K 11/88 (2006.01); C09K 11/70 (2006.01); C09K 11/08 (2006.01); H01L 33/00 (2010.01); H01L 33/26 (2010.01); H01L 33/06 (2010.01); H01L 51/50 (2006.01); B82Y 40/00 (2011.01); B82Y 20/00 (2011.01)
CPC C09K 11/883 (2013.01) [C09K 11/0883 (2013.01); C09K 11/703 (2013.01); H01L 33/002 (2013.01); H01L 33/06 (2013.01); H01L 33/26 (2013.01); H01L 51/502 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01)] 20 Claims
 
1. An electroluminescent device comprising:
a first electrode and a second electrode facing each other, and
an emissive layer disposed between the first electrode and the second electrode, the emissive layer comprising quantum dots,
wherein at least a portion of the quantum dots comprise an alloy core comprising a first semiconductor nanocrystal comprising indium, gallium, and phosphorous, and a semiconductor nanocrystal shell disposed on the alloy core,
wherein in the quantum dots comprising the alloy core and the semiconductor nanocrystal shell disposed on the alloy core, a mole ratio of gallium with respect to a sum of indium and gallium is greater than or equal to about 0.2:1 and less than or equal to about 0.75:1,
wherein the semiconductor nanocrystal shell comprises a zinc chalcogenide,
wherein the quantum dots comprising the alloy core and the semiconductor nanocrystal shell disposed on the alloy core do not comprise cadmium, and
wherein the quantum dots comprising the alloy core and the semiconductor nanocrystal shell disposed on the alloy core are configured to emit blue light having a maximum emission peak wavelength that is greater than or equal to about 440 nanometers and less than or equal to about 480 nanometers.