Provided are a barium germanium oxide having a 3-4 eV band gap, a method for producing the same, a sintered body thereof, and a target thereof. The barium germanium oxide includes at least Ba, Ge, and O, includes a crystal represented by a general formula of ABO.sub.3 (here, A includes at least Ba and B includes at least Ge), and has a hexagonal 6H-type perovskite structure.

A perovskite-based photoelectric functional material having a general formula M.sub.zA.sub.yBX.sub.z+y+2. The matrix of the photoelectric functional material is a perovskite material ABX.sub.3, M is an organic amphipathic molecule used as a modification component of the matrix, 0<z?0.5, 0<y?1, and y+z?1.

A light-absorbing material includes a compound, wherein the compound has a perovskite crystal structure represented by the formula AMX.sub.3 where a Cs.sup.+ ion is located at an A-site, a Ge.sup.2+ ion is located at an M-site, and I.sup.? ions are located at X-sites, and at least a part of the compound has an orthorhombic perovskite crystal structure. An X-ray diffraction pattern of the compound measured using Cu K? radiation may have a first peak at a diffraction angle (2?) of 25.4? or more and 25.8? or less and a second peak at a diffraction angle (2?) of 24.9? or more and 25.3? or less, and an intensity of the first peak may be 30% or more of an intensity of the second peak.

A main object of the present invention is to provide a sulfide solid electrolyte material having favorable ion conductivity and low reduction potential. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material including an M.sub.1 element (such as a Li element), an M.sub.2 element (such as a Ge element, a Si element and a P element) and a S element, wherein the material has a peak at a position of 2=29.580.50 in X-ray diffraction measurement using a CuK line; and when a diffraction intensity at the peak of 2=29.580.50 is regarded as I.sub.A and a diffraction intensity at a peak of 2=27.330.50 is regarded as I.sub.B, a value of I.sub.B/I.sub.A is less than 0.50, and M.sub.2 contains at least P and Si.

The invention provides disilenes, germasilenes and neopentatetrelanes, a method for the preparation thereof and use thereof.

A process for synthesizing a Mn.sup.4+ doped phosphor of formula I by electrolysis is presented. The process includes electrolyzing a reaction solution comprising a source of manganese, a source of M and a source of A. One aspect relates to a phosphor composition produced by the process. A lighting apparatus including the phosphor composition is also provided. A.sub.x[MF.sub.y]:Mn.sup.4+ (I) where, A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7.

An oxide fluorescent material has a composition represented by the following formula (1):

(Mg.sub.1-pM.sup.1.sub.p).sub.q(Li.sub.1-rM.sup.2.sub.r).sub.s(In.sub.1-tM.sup.3.sub.t).sub.u(Ge.sub.1-vM.sup.4.sub.v).sub.wOx:Cr.sub.y,M.sup.5.sub.z(1) wherein M.sup.1 represents at least one element selected from the group consisting of Ca, Sr, Ba, and Zn; M.sup.2 represents at least one element selected from the group consisting of Na, K, Rb, and Cs; M.sup.3 represents at least one element selected from the group consisting of Al, Ga, and Sc; M.sup.4 represents at least one element selected from the group consisting of Si, Ti, Zr, Sn, and Hf; M.sup.5 represents at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb; and p, q, r, s, t, u, v, w, x, y, and z satisfy 0p1.0, 0.1q0.9, 0r1.0, 0.05s0.45, 0t0.5, 0.05u0.45, 0v1.0, 0.8w1.3, 2.6x3.6, 0.002y0.5, 0z0.3, and 0.9q+s+u1.2.

The present invention can provide a method for preparing a sulfide-based solid electrolyte in a short time using a solvothermal synthesis method. In addition, the present invention may provide a sulfide-based solid electrolyte prepared by the method. In addition, the present invention may provide an electrode for an all-solid-state battery including the sulfide-based solid electrolyte.

Semiconductor nanoparticles that include a compound semiconductor mainly containing a Ag component, a Ge component, and a S component, wherein a content ratio of the Ag component to the Ge component is 1.0 or more and less than 7.5, in terms of molar ratio, and an average particle size of the semiconductor nanoparticles is 9 nm or less

An oxide fluorescent material has a composition represented by the following formula (1).

(Ga.sub.1-uM.sup.1.sub.u).sub.2(Ge.sub.1-vM.sup.2.sub.v).sub.wO.sub.x:Cr.sub.y,M.sup.3.sub.z(1), wherein M.sup.1 represents at least one element selected from the group consisting of Al, Sc, and In; M.sup.2 represents at least one element selected from the group consisting of Si, Ti, Zr, Sn, and Hf, M.sup.3 represents at least one element selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb; and u, v, w, x, y, and z satisfy 0u1.0, 0v0.5, 1.0w3.0, 5x9, 0.005y1.0, and 0z0.5, respectively.