Quantum dot and electroluminescent element
AssigneesSharp Kabushiki Kaisha, Toppan Inc.
InventorsTADASHI KOBASHI, HIROHISA YAMADA, TAKAHIRO DOE, Keisuke KITANO, Masaki YAMAMOTO, Yuko OGURA, Masanori TANAKA, Mikihiro TAKASAKI, Yuka TAKAMIZUMA, Soichiro NIKATA, Tetsuji ITO, Mayuko WATANABE
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Abstract
A QD is a Cd-free quantum dot including a core and a shell and configured to emit blue light. The core at least contains Zn and Se. The shell has a film thickness in a range from 0.5 nm to 3 nm, contains Zn, Se, and S in a boundary portion adjacent to the core, and contains Zn and S in an outermost portion.
Claims14
A quantum dot containing no cadmium (Cd) and configured to emit blue light, the quantum dot comprising:
- a core;
- and
- a shell provided on a surface of the core,
- wherein the core at least contains Zn and Se, and
- the shell
- has a thickness in a range from 0.5 nm to 3 nm,
- contains Zn, Se, and S in a boundary portion adjacent to the core, and
- contains Zn and S in an outermost portion.
A quantum dot containing no Cd, configured to emit blue light, and used in an electroluminescent element for a display device, the quantum dot comprising:
- a core;
- and
- a shell covering the core,
- wherein the core at least contains Zn and Se,
- a film thickness of the shell falls within a range from 0.5 nm to 3 nm, and
- in a case that
- an operation voltage of the electroluminescent element at a luminance of 5 cd/m2 is taken as Vmin,
- in a case where a maximum operation voltage set as the electroluminescent element is lower than 8 V, the maximum operation voltage is taken as Vmax, and
- in a case where the maximum operation voltage is higher than or equal to 8 V, 8 Vis taken as Vmax,
- a variation in a light emission peak wavelength is smaller than or equal to 1 nm at the operation voltage in a range from the Vmin to the Vmax.
Dependencies are inferred from the claim text.