With an aim to provide a method for producing an oxide particle with controlled color characteristics and also provide an oxide particle with controlled color characteristics, the present invention provides a method for producing an oxide particle, wherein the color characteristics of the oxide particle are controlled by controlling a ratio of an M-OH bond between an element (M) and a hydroxide group (OH) or an M-OH bond/M-O bond ratio, where the element (M) is one element or plural different elements other than oxygen or hydrogen included in the oxide particle selected from metal oxide particles and semi-metal oxide particles. According to the present invention, by controlling the M-OH bond or the M-OH bond/M-O bond ratio of the metal oxide particle or the semi-metal oxide particle, the oxide particle with controlled color characteristics of any of reflectance, transmittance, molar absorption coefficient, hue, and saturation can be provided.

Provided is a method for producing calcium zincate. The method comprises: an extraction step: mixing a ground zinc-containing raw material with an extracting agent, followed by filtration to obtain an extract, wherein the extracting agent is a mixed aqueous solution of ammonia and {NH.sub.4HCO.sub.3 and/or (NH.sub.4).sub.2CO.sub.3; optionally, purifying the extract; a decarburization step: adding calcium oxide and/or calcium hydroxide to the extract, stirring, and filtering to obtain a first solid and a first filtrate; a calcium zincate synthesis step: adding calcium hydroxide and/or calcium oxide to the first filtrate, stirring to react, and filtering to obtain a second solid and a second filtrate; optionally, rinsing the second solid with water; a drying step: drying the second solid to obtain the final calcium zincate product.

The present disclosure provides a solid electrolyte material having high lithium ion conductivity. The solid electrolyte material of the present disclosure includes Li, M1, M2 and X, and has a spinel structure. M1 is at least one element selected from the group consisting of Mg and Zn. M2 is at least one element selected from the group consisting of Al, Ga, Y, In and Bi. X is at least one element selected from the group consisting of F, Cl, Br and I.

The present disclosure provides a solid electrolyte material having high lithium ion conductivity. The solid electrolyte material of the present disclosure includes Li, M and X. M is at least one element selected from the group consisting of Mg, Zn and Cd. X is at least two elements selected from the group consisting of Cl, Br and I.

A quantum dot including zinc, tellurium, selenium, and sulfur, wherein the quantum dot comprises a core and a shell disposed on the core, and wherein the quantum dot is a cadmium-free red light-emitting quantum dot and has an emission peak wavelength of greater than or equal to about 600 nanometers (nm), and efficiency of greater than or equal to about 50%.

An oriented apatite-type oxide ion conductor includes a composite oxide expressed as A.sub.9.33+x[T.sub.6.00−yM.sub.y]O.sub.26.0+z, where A represents one or two or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Be, Mg, Ca, Sr, and Ba, T represents an element including Si or Ge or both, and M represents one or two or more elements selected from the group consisting of B, Ge, Zn, Sn, W, and Mo, and where x is from −1.00 to 1.00, y is from 0.40 to less than 1.00, and z is from −3.00 to 2.00.

A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound.

The disclosure provides a method of producing a metal compound. The method comprises contacting a metal source with a reaction mixture, wherein the reaction mixture comprises an ionic liquid and an oxidising agent, and thereby producing the metal compound.

A quantum dot including a nanoparticle template including a first semiconductor nanocrystal including a Group II-VI compound, a quantum well including a second semiconductor nanocrystal disposed on the nanoparticle template, the second semiconductor nanocrystal including a Group IIIA metal excluding aluminum and a Group V element; and a shell comprising a third semiconductor nanocrystal disposed on the quantum well, the third semiconductor nanocrystal including a Group II-VI compound, wherein the quantum dot does not include cadmium, a band gap energy of the second semiconductor nanocrystal is less than a band gap energy of the first semiconductor nanocrystal, the band gap energy of the second semiconductor nanocrystal is less than a band gap energy of the third semiconductor nanocrystal, and the quantum dot includes an additional metal including an alkali metal, an alkaline earth metal, aluminum, iron, cobalt, nickel, copper, zinc, or a combination thereof.

A cadmium free quantum dot or a population thereof or a device including the same, wherein the cadmium free quantum dot includes a core (or a semiconductor nanocrystal particle) including a first semiconductor including a Group IIB-VI compound and a shell (or a coating) disposed on the core (or the semiconductor nanocrystal particle) including a Group IIB-V compound and exhibits a quantum efficiency of about 60% or higher.