Provided is an oxide fluorescent material having a light emission peak in a wavelength range from red light to near-infrared light.

The oxide fluorescent material has a composition including: a first element M.sup.1 being at least one element selected from the group consisting of Li, Na, K, Rb, and Cs; a second element M.sup.2 being at least one element selected from the group consisting of Ca, Sr, Mg, Ba, and Zn; Ge; O (oxygen); and Cr, the composition optionally including: a third element M.sup.3 being at least one element selected from the group consisting of Si, Ti, Zr, Sn, Hf, and Pb; and a fourth element M.sup.4 being at least one element selected from the group consisting of Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm, Ni, and Mn. When the molar ratio of Ge, or the total molar ratio of the third element M.sup.3 and Ge in the case of comprising the third element M.sup.3, in 1 mol of the composition of the oxide fluorescent material is 6, the molar ratio of the first element M.sup.1 is 1.5 or more and 2.5 or less, the molar ratio of the second element M.sup.2 is 0.7 or more and 1.3 or less, the molar ratio of the third element M.sup.3 is 0 or more and 0.4 or less, the molar ratio of O (oxygen) is 12.9 or more and 15.1 or less, and the molar ratio of Cr is 0.2 or less. The oxide fluorescent material has a light emission peak wavelength of 700 nm or more and 1,050 nm or less in a light emission spectrum of the oxide fluorescent material.

A device including an LED light source optically coupled to a phosphor material including a green-emitting phosphor selected from the group consisting of compositions (A1)-(A62) and combinations thereof.

Provided is an oxide phosphor having a light emission peak in a wavelength range from red light to near-infrared light. An oxide phosphor having a composition represented by Formula (1): (Li.sub.1?uM.sup.1.sub.u).sub.2M.sup.2.sub.vM.sup.3.sub.wO.sub.x:Cr.sub.y,M.sup.4.sub.z (1). wherein M.sup.1 is at least one element selected from the group consisting of Na, K, Rb and Cs; M.sup.2 is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn; M.sup.3 is at least one element selected from the group consisting of Si, Ge, Ti, Zr, Sn, and Hf; M.sup.4 is 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 0?u?1.0, 0.8?v?3.0, 1.8?w?6, 5.4?x?16, 0.005?y?1.0, and 0?z?0.5, respectively.

A light-emitting device includes a light-emitting element and a phosphor that absorbs at least a portion of light from the light-emitting element and emits light. The phosphor includes two or more types of phosphors each having a light emission peak wavelength in a different range. The two or more types of phosphors are selected from the group consisting of a first phosphor having a light emission peak wavelength within a first range of 700 nm to less than 800 nm, a second phosphor having a light emission peak wavelength within a second range of 800 nm to less than 1100 nm, and a third phosphor having a light emission peak wavelength within a third range of 1100 nm to less than 1500 nm.

Provided is an oxide phosphor having a light emission peak wavelength of 800 nm or greater. The oxide phosphor has a composition containing Mg, Ga, O, and Cr, and optionally containing a first element M.sup.1, a second element M.sup.2, and a third element M.sup.3. When a total molar ratio of Ga, Cr, the second element M.sup.2, and the third element M.sup.3 per mole of the composition of the oxide phosphor is 2, the molar ratio of Mg or the molar ratio of a total of Mg and the first element M.sup.1 is in a range from 0.7 to 1.3, the molar ratio of O is in a range of 3.7 to 4.3, and the molar ratio of Cr is in a range greater than 0.02 and 0.3 or less. The oxide phosphor has a light emission peak wavelength in a range of 800 nm to 1600 nm in a light emission spectrum.

Compositions and methods for determining the origin location of a subterranean rock sample. Compositions include a nanoparticle tag with a fluorescent core and a polymer shell. The fluorescent core can include up-converting nanoparticles, rare earth element doped oxide, long persistent fluorescent materials, or encapsulated lanthanide complexes. Methods include mixing a nanoparticle tag into a fluid, flowing the fluid through a work string into a subterranean formation, recovering subterranean rock samples from the subterranean formation, and determining an origin location of the subterranean rock sample by detecting the presence of the nanoparticle tag on the sample.

The present disclosure relates to novel compositions comprising hydrophilic polymer-conjugated bilirubin-coated radio-luminescent particle or particle aggregates, and methods to make and use the novel compositions. A specific novel PEG-BR/CWO NP system provided in this disclosure comprises a CaWO.sub.4 nanoparticle (CWO NP) core encapsulated by a poly (ethylene glycol)-bilirubin conjugate micelle (PEG-BR micelle).

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.

Direct synthesis methods are generally provided that include reacting Na.sub.2(WO.sub.4).Math.2H.sub.2O (and/or Na.sub.2(GeO.sub.4).Math.2H.sub.2O) with NaF in an inert atmosphere at a reaction tion temperature of about 950 C. to about 1400 C., along with the resulting structures and compositions.

An oxide phosphor includes phosphor particles containing a host crystal containing Ga and oxygen and an activating element, and a first compound particle disposed on at a surface(s) of the phosphor particles, the at least one first compound particle containing an oxide particle containing a first element selected from the group consisting of Group 4 elements, Group 5 elements, Group 14 elements, and Group 15 elements.