A process for detecting oil or lubricant contamination in the production of an article by adding a Stokes-shifting taggant to an oil or lubricant of a machine utilized to produce the article or a component thereof, irradiating the articles produced with a first wavelength of radiation, and monitoring the articles for emission of radiation at a second wavelength. The taggant can be in the form of a composition containing a Stokes-shifting taggant, which absorbs radiation at a first wavelength and emits radiation at a second wavelength, different from said first wavelength, dissolved or dispersed in an oil or lubricant.

It is an object of the present invention to improve light source efficiency of “a light-emitting device capable of realizing a natural, vivid, highly visible and comfortable appearance of colors or an appearance of objects” already arrived at by adopting a spectral power distribution having a shape completely different from the shape of conventionally known spectral power distributions while maintaining favorable color appearance characteristics.

The invention provides luminescent material comprising E.sub.1-wSc.sub.1-x-y-u-wM.sub.yZ.sub.uA.sub.2wSi.sub.2-z-uGe.sub.zAl.sub.uO.sub.6:Cr.sub.x, wherein: E comprises one or more of Li, Na, and K; M comprises one or more of Al, Ga, In, Tm, Yb, and Lu; Z comprises one or more of Ti, Zr, and Hf; A comprises one or more of Mg, Zn, and Ni; 0<x≤0.25; 0≤y≤0.75; 0≤z≤2; 0≤u≤1; 0≤w≤1; x+y+u+w≤1; and z+u≤2.

The present application relates to a technical filed of energy sources and illumination, and discloses a rare earth oxide nanosheet composite modified by an organic ligand, a preparation method and an organic light-emitting diode (OLED) luminescent film. The rare earth oxide nanosheet composite modified by the organic ligand is obtained by adding the organic ligand in the rare earth nanosheet sol for ultrasonic coordination; and a mole ratio of the rare earth nanosheet sol to the organic ligand is 1:(3-9).

A luminophore may have the general formula A.sub.xM.sub.yX.sub.z:RE. A may be selected from the group of the trivalent cations. M may be selected from the group of the trivalent cations and includes at least two elements from the following group: Ga, Sc, Al, In, Sb, Bi, As, and Lu. X may be selected from the group of the divalent anions. RE may be a dopant and may be selected from the group formed by the following elements and the combinations of the following elements: Ni, Mn, Cr, Co, Fe, and Sn, where

0.8≤x≤1.2,

0.8≤y≤1.2 and

2.7≤z≤3.3.

A process is also disclosed for producing a luminophore, an optoelectronic component, and an NIR spectrometer.

Lutetium oxide-based scintillator materials, as well as corresponding methods and systems, are described.

An article comprising a luminescent nanoparticle is described, wherein the luminescent nanoparticle is selected from the group consisting of oxide nanoparticles, aluminate nanoparticles, and germanate nanoparticles; and wherein the luminescent nanoparticle is doped with one or more metals or rare-earth elements. A method of making a luminescent nanoparticle is also described, the method comprising the steps of: providing a nanoparticle, doping the nanoparticle with one or more chemical elements, heating the nanoparticle to a temperature of between about 1000° C. and about 1200° C. to alter the crystal structure of the nanoparticle and/or to create oxygen vacancies in the nanoparticle. A persistent luminescent nanoparticle is described, said persistent luminescent nanoparticle being selected from the group consisting of: LaAlO.sub.3 nanoparticles, Gd.sub.2O.sub.3 nanoparticles, SrAl.sub.2O.sub.4 nanoparticles, Y.sub.2O.sub.3 nanoparticles, and combinations thereof; wherein the nanoparticle is doped with about 1% or less of a chemical element selected from the group consisting of: holmium, europium, ytterbium, neodymium, magnesium, and combinations thereof.

Embodiments of the invention include a semiconductor light emitting device for emitting a first light at a first wavelength and a wavelength conversion medium arranged to convert at least part of the first light into a second light at a second wavelength. The wavelength conversion medium is disposed between a periodic antenna array and the semiconductor light emitting device. The periodic antenna array includes a plurality of antennas. The periodic antenna array supports surface lattice resonances arising from diffractive coupling of localized surface plasmon resonances in at least one of the antennas.

A process for detecting oil or lubricant contamination in a manufactured product, the process comprising adding a fluorescent taggant to oils or lubricants contained in processing machinery for said product, conveying said product past an infrared detection apparatus, irradiating said product with infrared radiation from said detection apparatus as it passes the detection apparatus, and detecting infrared radiation emitted from said irradiated product.

The application relates to fluorescent powder which has a garnet structure and can be effectively excited by ultraviolet light or blue light, a method for preparing the fluorescent powder, and a light emitting device, an image display device and an illumination device comprising the fluorescent powder. A chemical formula of the fluorescent powder is expressed as: (M.sup.1a-xM.sup.2x)ZrbM.sup.3cOd, where M.sup.1 is one or two elements selected from Sr, Ca, La, Y, Lu and Gd, Ca or Sr being necessary; M.sup.2 is one or two elements selected from Ce, Pr, Sm, Eu, Tb and Dy, Ce being necessary; M.sup.3 is at least one element selected from Ga, Si, and Ge, Ga being necessary; and 2.8≦a≦3.2, 1.9≦b≦2.1, 2.8≦c≦3.2, 11.8≦d≦12.2, and 0.002≦x≦0.6.