Quantum dot device and quantum dots
AssigneeSamsung Electronics Co., Ltd.
InventorsJin A Kim, Yuho Won, Sung Woo Kim, Tae Hyung Kim, Jeong Hee Lee, Eun Joo Jang
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Abstract
Quantum dots and electroluminescent devices including the same, wherein the quantum dots include a core including a first semiconductor nanocrystal including a zinc chalcogenide; and a shell disposed on the core, the shell including zinc, sulfur, and selenium, wherein the quantum dots have an average particle size of greater than 10 nm, wherein the quantum dots do not include cadmium, and wherein a photoluminescent peak of the quantum dots is present in a wavelength range of greater than or equal to about 430 nm and less than or equal to about 470 nm.
Claims21
Quantum dots comprising
- a first semiconductor nanocrystal comprising a zinc chalcogenide,
- wherein the quantum dots are configured to emit blue light having a maximum luminescent peak wavelength in a range of greater than or equal to about 440 nanometers and a quantum yield of the quantum dots is greater than or equal to 60%,
- wherein the quantum dots have an average value of solidity of greater than or equal to about 0.85, and
- wherein the zinc chalcogenide comprises zinc, selenium, and tellurium.
An electroluminescent device, comprising
- a first electrode and a second electrode,
- an emission layer disposed between the first electrode and the second electrode, the emission layer comprising quantum dots, and
- wherein each of the quantum dots comprises a semiconductor nanocrystal comprising zinc, sulfur, and selenium,
- wherein the quantum dots do not comprise cadmium,
- wherein a maximum luminescent peak wavelength of the electroluminescent device is greater than or equal to 445 nanometers and less than or equal to about 470 nanometers,
- wherein the electroluminescent device is configured to exhibit a maximum external quantum efficiency of greater than or equal to about 6.3% or a maximum brightness of greater than or equal to about 1950 cd/m2.
Dependencies are inferred from the claim text.