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US 12,577,464 B2Granted
Quantum dot and method for producing the same
AssigneeToppan Inc.
InventorsSoichiro Nikata, Yoko Michiwaki, Tomoaki Hieda, Yuko Ogura, Akio Mishima, Vit Kalousek
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Abstract
To provide Cd-free chalcopyrite-based quantum dots with a narrow fluorescence FWHM and a high fluorescence quantum yield. The quantum dots of the present invention contain AgInxGa1−xSySe1−y or ZnAgInxGa1−xSySe1−y (where 0≤x<1 and 0≤y≤1) and exhibit fluorescence properties including a fluorescence FWHM of less than or equal to 45 nm and a fluorescence quantum yield of greater than or equal to 35% in the green wavelength range to the red wavelength range.
Claims9
A method for synthesizing quantum dots, comprising:
- synthesizing
- a composition including
- an organic silver compound,
- an organic gallium compound, and
- sulfur or selenium, or
- a composition including
- an organic silver compound,
- an organic indium compound,
- an organic gallium compound,
- and sulfur or selenium, and
- thereafter, adding an organic zinc compound or an inorganic zinc compound, each quantum dot containing ZnAgInxGa1−xSySe1−y (wherein 0≤x<1 and 0≤y≤1),
- wherein the quantum dot contains at least silver (Ag), gallium (Ga), and selenium (Se), or contains at least silver (Ag), gallium (Ga), and sulfur(S), and does not contain cadmium (Cd).
9 more elements
Dependencies are inferred from the claim text.