Provided is an anti-counterfeit marking technique for verifying authenticity of objects using x-ray fluorescence (XRF) analysis.

Provided is an anti-counterfeit marking technique for verifying authenticity of objects using x-ray fluorescence (XRF) analysis.

A wavelength conversion member includes a sintered body of a phosphor. An average diameter of pores in an arbitrary cross section falls within a range of not less than 0.28 μm and not more than 0.98 μm. A ratio of an area of pores to a whole area in an arbitrary cross section falls within a range of not less than 0.04% and not more than 2.7%. An average diameter of grains of the phosphor in an arbitrary cross section falls within a range of not less than 1 μm and not more than 3 μm.

An iridium complex compound of formula (10): ##STR00001## wherein Ir represents an iridium atom. m.sub.1 represents an integer of 1 or 2, n.sub.1 represents an integer of 1 or 2, and m.sub.1+n.sub.1=3. R.sup.a1 at each occurrence represents an alkyl group or an aralkyl group. R.sup.b1, R.sup.c1, and R.sup.21 to R.sup.24 each independently represent a hydrogen atom or a substituent. and R.sup.a1 to R.sup.c1 and R.sup.21 to R.sup.24 may be further bonded to each other to form a ring, and wherein at least one of R.sup.b1 and R.sup.c1 is a substituted or unsubstituted aromatic or heteroaromatic group.

A phosphor plate including a base material, and a plate-shaped composite including phosphors dispersed in the base material, in which a main component of the base material is alumina, the phosphor includes an α-type sialon phosphor, and L* value satisfies 73.5 or more and 85.0 or less, a* value satisfies 4.4 or more and 8.0 or less, and b* value satisfies 10.8 or more and 13.0 or less in L*a*b* color coordinates of the phosphor plate in a case of being measured in accordance with JIS Z 8781-4.

Provided are a perovskite light emitting device containing an exciton buffer layer, and a method for manufacturing the same. A light emitting device of the present invention comprises: an exciton buffer layer in which a first electrode, a conductive layer disposed on the first electrode and comprising a conductive material, and a surface buffer layer containing fluorine-based material having lower surface energy than the conductive material are sequentially deposited; a light-emitting layer disposed on the exciton buffer layer and containing a perovskite light-emitter; and a second electrode disposed on the light-emitting layer. Accordingly, a perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle light-emitter. The present invention can also form a lamellar or layered structure in which an organic plane and an inorganic plane are alternatively deposited; and an exciton can be bound by the inorganic plane, thereby being capable of expressing high color purity.

A preparation method and use of a green fluorescent transparent ceramic are disclosed. The preparation method includes: weighing, according to a stoichiometric ratio, elements present in Ca.sub.3-x-yCe.sub.xA.sub.ySc.sub.2-xB.sub.zSi.sub.3-mC.sub.mO.sub.12, in forms of oxides, carbonates or nitrates as raw materials; mixing the raw materials, annealing, melting at a high temperature, cooling and annealing at a low temperature; putting the glass into a high-temperature furnace, holding, raising the temperature, and performing crystallization and densification sintering; finally cutting, reducing and surface-polishing, where A is at least one from the group consisting of Lu, Y, Gd, La and Na; B is at least one from the group consisting of Zr, Hf and Mg; C is at least one from the group consisting of Al and P; x, y, z and m satisfy 0.001≤x≤0.06, 0≤y≤0.06, 0≤z≤0.06 and 0≤m≤0.3, respectively.

The present invention relates to a novel thieno[3,2-b]pyridine-5(4H)-one derivative compound, a preparation method thereof, and a use thereof. The novel thieno[3,2-b]pyridine-5(4H)-one derivative compound according to the present invention is synthesized via an aza-[3+3] cyclization addition reaction using BOP, wherein the compound is obtained by synthesizing a 4-arylthiophen-3-amine in which aryl groups such as 4-piperidyl-C6H4, 4-pyrrolidyl-C6H4, 4-MeOC6H4, 3,4,5-(MeO)3C6H4, C6H5, 4-C6H5C6H4, and 4-F3COC6H4 are introduced via a synthesis process by a bromination reaction, a hydrolysis reaction, a decarboxylation reaction, and a Suzuki coupling reaction of methyl 3-aminothiophene carboxylate, and by synthesizing 4-arylthiophen-3-amine and mono-methyl fumarate via a formal aza-[3+3] cyclization addition reaction using BOP and conjugation. Accordingly, novel thieno[3,2-b]pyridine-5(4H)-one derivative compounds according to the present invention have fluorescence properties with a wide range of emission wavelengths and thus may be utilized in various industrial fields such as physics, chemistry, and biomedical research.

A method of applying a trivalent chromium or chromium-free conversion coating to a metallic substrate including mixing a dye compound that interacts with electromagnetic radiation outside the human visual spectrum but not electromagnetic radiation that is within the human visual spectrum to produce an observable emission into the trivalent chromium or chromium-free conversion coating mixture to allow for inspection of the coating after applied with a correlating electromagnetic radiation source.

A nanoplatelet including a two-dimensional template including a first semiconductor nanocrystal; and a first shell including a second semiconductor nanocrystal disposed on a surface of the two-dimensional template, the second semiconductor nanocrystal having a composition different from the first semiconductor nanocrystal, wherein the second semiconductor nanocrystal includes a Group III-V compound, and wherein the nanoplatelet does not include cadmium.