A light emitting device includes a solid-state light emitting element that emits a pulsed light, a wavelength converter including a phosphor that emits a wavelength-converted light having a wavelength longer than that of the pulsed light, and a light guide member including a light input end and a light output end. The wavelength converter is disposed on a light output end side of the light guide member. The pulsed light is input to the light guide member through the light input end and output through the light output end to be emitted to the wavelength converter. The wavelength-converted light has a fluorescence spectrum having a maximum intensity value in a wavelength range exceeding 710 nm. An electronic apparatus includes the light emitting device. An inspection method includes using the light emitting device.

A coating including a plurality of indicator oxide nanoparticles, a binder, and a wetting agent. A sulfidation corrosion mitigation coating including: a sulfidation corrosion mitigation material, a binder, and a plurality of indicator oxide nanoparticles. An article including a metal alloy substrate having the sulfidation corrosion mitigation coating thereon is also provided. The sulfidation corrosion mitigation coating can include a first indicator layer containing indicator oxide nanoparticles disposed on the surface of the metal alloy substrate. Methods for inspection of an article having a coating containing a plurality of indicator oxide nanoparticles is also provided.

The present invention relates to a polysulfide upconversion phosphor, and belongs to the field of new optical function materials. The phosphor uses polysulfide as a substrate and rare earth ions as activators, and has a general formula of composition: mA.sub.2S.Math.nBS.Math.kC.sub.2-xS.sub.3:D.sub.x. The upconversion phosphor provided by the present invention can emit ultraviolet, blue, blue-green, green, red and near-infrared light when excited by near infrared light at 750-1650 nm. Because the upconversion phosphor provided by the present invention uses polysulfide with low phonon energy and symmetry as a substrate material, and optimizes rare earth ions to be doped into the matrix material as luminescence centers, the upconversion phosphor has higher upconversion luminescence efficiency and safety and wider application range compared with industrial NaYF.sub.4:Yb, Er material.

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.

Provided is a reddish light emitting phosphorescent phosphor, that is efficiently excited with visible light and is chemically stable. The phosphorescent phosphor comprises a compound represented by MSi.sub.2O.sub.2N.sub.2:Yb,R, wherein M is at least one metal element selected from strontium, calcium, barium, and magnesium, and R is at least one element selected front erbium, holmium, gadolinium, praseodymium, terbium, dysprosium, neodymium, bismuth, scandium, and chromium. The phosphorescent phosphor is an excellent phosphorescent phosphor having a reddish afterglow.

A light-emitting device 1 includes: a solid-state light-emitting element 10 that radiates a laser beam L; and a wavelength converter 50 including a plurality of types of phosphors which receive the laser beam L and radiate light. The phosphors 50 included in the wavelength converter are substantially composed of a Ce.sup.3+-activated phosphor. Then, output light of the light-emitting device 1 has a light component across a wavelength range of at least 420 nm or more and less than 700 nm. The light-emitting device 1 is capable of radiating light with high color rendering properties over a wide wavelength range.

A light-emitting device 1 includes: a solid-state light-emitting element 10 that radiates a laser beam L; and a wavelength converter 50 including a plurality of types of phosphors which receive the laser beam L and radiate light. The phosphors 50 included in the wavelength converter are substantially composed of a Ce.sup.3+-activated phosphor. Then, output light of the light-emitting device 1 has a light component across a wavelength range of at least 420 nm or more and less than 700 nm. The light-emitting device 1 is capable of radiating light with high color rendering properties over a wide wavelength range.

The phosphorescent phosphor of the present invention is represented by the composition formula: Sr.sub.1-aMg.sub.bZn.sub.cAl.sub.2O.sub.4;Eu.sub.dM.sub.e wherein a, b, c, d, and e satisfy 0.05a0.8, 0.01b0.1, 0c0.2, 0d0.2, and 0e0.15, respectively, and M represents at least one element selected from the group consisting of dysprosium, samarium, lanthanum, praseodymium, terbium, holmium, thulium, lutetium, ytterbium, erbium, gadolinium, neodymium and cerium, and emits light due to excitation light in a wavelength region of 430 to 480 nm.

The invention relates to rare-earth-doped ternary sulfides. The rare-earth-doped ternary sulfides may be used as an active material for mid-wave infrared and long-wave infrared lasers and amplifiers. Methods for producing laser materials including rare-earth-doped ternary sulfides, as well as lasers and amplifiers incorporating the laser materials, are also provided.

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.