Electroluminescent element, display, method for manufacturing electroluminescent element, and liquid composition

A method for manufacturing an electroluminescent element including a quantum dot light-emitting layer containing quantum dots and a surface modifier configured to protect surfaces of the quantum dots, the method for manufacturing an electroluminescent element comprising:

• a quantum dot synthesis step for synthesizing copper chalcogenide as a precursor from an organic copper compound or an inorganic copper compound and an organic chalcogen compound, and synthesizing the quantum dots by using the copper chalcogenide;
• and
• a liquid composition preparation step for preparing a liquid composition containing the quantum dots synthesized in the quantum dot synthesis step, and the surface modifier,
• wherein in the quantum dot synthesis step, the quantum dots are synthesized, the quantum dots (i) containing nanocrystals containing zinc and selenium or zinc, selenium, and sulfur, (ii) having a fluorescent half width of 25 nm or less, and (iii) having a fluorescent peak wavelength of 410 nm or more and 470 nm or less, and
• in the liquid composition formation step, an amount of the surface modifier is adjusted, and a weight ratio of the surface modifier to the quantum dots in the quantum dot light-emitting layer is 0.115 or more and 0.207 or less.

A liquid composition comprising:

• quantum dots;
• and
• a surface modifier configured to protect surfaces of the quantum dots,
• wherein the quantum dots contain nanocrystals containing zinc and selenium, or zinc, selenium, and sulfur,
• a fluorescent half width of the quantum dots is 25 nm or less and a fluorescent peak wavelength of the quantum dots is 410 nm or more and 470 nm or less, and
• a weight ratio of the surface modifier to the quantum dots is 0.115 or more and 0.207 or less.