Abstract: A core shell quantum dot including a core including a first semiconductor nanocrystal and including zinc, tellurium, and selenium and a semiconductor nanocrystal shell disposed on the core and including a zinc chalcogenide, a method of manufacture thereof, and a device including the same are disclosed, wherein the core shell quantum dot does not include cadmium, lead, mercury, or a combination thereof, wherein in an X-ray photoelectron spectrum of the quantum dot, a peak area for Te oxide to a peak area for Te3d5/2 as an area percentage is less than or equal to about 25%.

Abstract: A core-shell quantum dot including a core including a first semiconductor nanocrystal, the first semiconductor nanocrystal including zinc, tellurium, and selenium and a semiconductor nanocrystal shell disposed on the core, the semiconductor nanocrystal shell including zinc and selenium, sulfur, or a combination thereof and a production thereof are disclosed, wherein the core-shell quantum dot does not include cadmium, lead, mercury, or a combination thereof, wherein the core-shell quantum dot(s) includes chlorine, wherein in the core-shell quantum dot, a mole ratio of chlorine with respect to tellurium is greater than or equal to about 0.01:1 and wherein a quantum efficiency of the core-shell quantum dot is greater than or equal to about 10%.

Abstract: The present invention provides a positive electrode active material powder for lithium-ion rechargeable batteries, wherein the positive electrode active material comprises Li, M?, S and O, wherein M? consists of: Ni in a content x between 60.0 mol % and 95.0 mol %, relative to M? Co in a content y between 0.0 mol % and 25.0 mol %, relative to M?, Mn in a content z between 0.0 mol % and 25.0 mol %, relative to M?, W in a content a of 0.05 mol % or more, relative to M? D in a content b between 0.0 mol % and 2.0 mol %, relative to M?, wherein D comprises at least one element of the group consisting of: Al, B, Ba, Ca, Cr, F, Fe, Mg, Mo, Nb, Si, Sr, Ti, Y, V, Zn and Zr, and, wherein x, y, z, a, and b are measured by ICP, wherein x+y+z+a+b is 100.0 mol %, wherein the positive electrode active material comprises soluble sulfur in a content of 0.30 mol % or more, relative to M?.

Abstract: A method and apparatus for providing an email service is provided. The method includes sorting received emails into preset categories, providing an interface for reading an email for each category, and determining whether to delete an email based on an automatic deletion option set for each category.