Abstract: A quantum dot including a core that includes a first semiconductor nanocrystal including zinc and selenium, and optionally sulfur and/or tellurium, and a shell that includes a second semiconductor nanocrystal including zinc, and at least one of sulfur or selenium is disclosed. The quantum dot has an average particle diameter of greater than or equal to about 13 nm, an emission peak wavelength in a range of about 440 nm to about 470 nm, and a full width at half maximum (FWHM) of an emission wavelength of less than about 25 nm. A method for preparing the quantum dot, a quantum dot-polymer composite including the quantum dot, and an electronic device including the quantum dot is also disclosed.

Abstract: A quantum dot light-emitting device including first electrode and a second electrode, a quantum dot layer between the first electrode and the second electrode, a first electron transport layer and a second electron layer disposed between the quantum dot layer and the second electrode. The second electron transport layer is disposed between the quantum dot layer and the first electron transport layer, wherein each of the first electron transport layer and the second electron transport layer includes an inorganic material. A lowest unoccupied molecular orbital energy level of the second electron transport layer is shallower than a lowest unoccupied molecular orbital energy level of the first electron transport layer, and a lowest unoccupied molecular orbital energy level of the quantum dot layer is shallower than a lowest unoccupied molecular orbital energy level of the second electron transport layer. An electronic device including the quantum dot light-emitting device.

Abstract: An arylamine-fluorene alternating copolymer having a structural unit (A) is represented by Chemical Formula (1): wherein Chemical Formula (1) is the same as described in the detailed description.

Abstract: The present invention discloses a buffer cushion for automobiles including: a main air chamber (2) having a size corresponding to the sizes of the automobile seats; an auxiliary air chamber (3) having a relatively smaller size than the main air chamber (2); an interconnecting chamber (4) formed integrally with the main air chamber (2) and auxiliary air chamber (3) for communicating the main air chamber (2) and the auxiliary air chamber 3 with each other to allow air injected into the buffer cushion to freely move between the main air chamber (2) and the auxiliary air chamber (3); and adjusting means (5) that is mounted on the auxiliary air chamber (3) for buffering the impact applied to the main air chamber (2) and adjusting a buffering force when the impact is applied to an automobile seat in upward and downward directions.

Abstract: The present invention discloses a buffer cushion for automobiles including: a main air chamber (2) having a size corresponding to the sizes of the automobile seats; an auxiliary air chamber (3) having a relatively smaller size than the main air chamber (2); an interconnecting chamber (4) formed integrally with the main air chamber (2) and auxiliary air chamber (3) for communicating the main air chamber (2) and the auxiliary air chamber 3 with each other to allow air injected into the buffer cushion to freely move between the main air chamber (2) and the auxiliary air chamber (3); and adjusting means (5) that is mounted on the auxiliary air chamber (3) for buffering the impact applied to the main air chamber (2) and adjusting a buffering force when the impact is applied to an automobile seat in upward and downward directions.