公开(公告)号：US11352558B2

公开(公告)日：2022-06-07

申请号：US16904664

申请日：2020-06-18

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Tae Gon Kim ,  Shin Ae Jun ,  Taek hoon Kim ,  Hyeyeon Yang ,  Nayoun Won ,  Jongmin Lee ,  Mi Hye Lim

IPC: C09K11/70 ,  C08F220/38 ,  C09K11/02 ,  C09K11/88 ,  H01L33/00 ,  H01L33/50 ,  B82Y20/00

Abstract: A quantum dot, and a composite and a display device including the quantum dot. The quantum dot comprises a semiconductor nanocrystal core comprising indium and phosphorous, a semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the first semiconductor nanocrystal shell comprising zinc, selenium, and sulfur, wherein the quantum dot does not comprise cadmium wherein the quantum dot has a maximum photoluminescence peak in a green light wavelength region, and wherein in an ultraviolet-visible (UV-Vis) absorption spectrum of the quantum dot, a ratio A450/Afirst, of an absorption value at 450 nm to an absorption value at a first excitation peak is greater than or equal to about 0.7, and a valley depth (VD) defined by the following equation is greater than or equal to about 0.4: (Absfirst−Absvalley)/Absfirst=VD wherein, Absfirst is an absorption value at the first absorption peak wavelength and Absvalley is an absorption value at a lowest point of the valley adjacent to the first absorption peak.

公开(公告)号：US11788005B2

公开(公告)日：2023-10-17

申请号：US17824225

申请日：2022-05-25

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Tae Gon Kim ,  Shin Ae Jun ,  Taek hoon Kim ,  Hyeyeon Yang ,  Nayoun Won ,  Jongmin Lee ,  Mi Hye Lim

IPC: C09K11/70 ,  C08F220/38 ,  C09K11/02 ,  C09K11/88 ,  H01L33/00 ,  H01L33/50 ,  B82Y20/00

CPC classification number: C09K11/70 ,  C08F220/382 ,  C09K11/025 ,  C09K11/88 ,  C09K11/883 ,  H01L33/005 ,  H01L33/502 ,  B82Y20/00 ,  H01L2933/0025 ,  H01L2933/0041

Abstract: Quantum dots and a composite and a display device including the quantum dots. The quantum dots comprise a semiconductor nanocrystal core comprising indium and phosphorous, and optionally zinc, a semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the first semiconductor nanocrystal shell comprising zinc, selenium, and sulfur, wherein the quantum dots are configured to exhibit a maximum photoluminescence peak in a green light wavelength region, and in an ultraviolet-visible (UV-Vis) absorption spectrum of the quantum dots, a ratio A450/Afirst, of an absorption value at 450 nm to an absorption value at a first excitation peak is greater than or equal to about 0.7, and a valley depth (VD) defined by the following equation is greater than or equal to about 0.4:

(Absfirst−Absvalley)/Absfirst=VD



wherein, Absfirst is an absorption value at the first absorption peak wavelength and Absvalley is an absorption value at a lowest point of the valley adjacent to the first absorption peak, and
wherein the maximum photoluminescence peak of the quantum dots has a full width at half maximum of less than or equal to 40 nanometers.