Provided is a wavelength conversion member that is less decreased in luminescence intensity with time by irradiation with light of an LED or LD and a light emitting device using the wavelength conversion member. A wavelength conversion member is formed of an inorganic phosphor dispersed in a glass matrix, wherein the glass matrix contains, in % by mole, 30 to 85% SiO.sub.2, 4.3 to 20% B.sub.2O.sub.3, 0 to 25% Al.sub.2O.sub.3, 0 to 3% Li.sub.2O, 0 to 3% Na.sub.2O, 0 to 3% K.sub.2O, 0 to 3% Li.sub.2O+Na.sub.2O+K.sub.2O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 5% ZnO, and the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphoric acid chloride phosphor.

A composite particle including a core and a shell, wherein the core has at least one inorganic nanoparticle and the shell is made of vitrified glass, methods for obtaining thereof and uses thereof. The uses include a film having a host material and at least one composite particle and an optoelectronic devise including at least one composite particle or the film.

A composite particle including a core and a shell, wherein the core has at least one inorganic nanoparticle and the shell is made of vitrified glass, methods for obtaining thereof and uses thereof. The uses include a film having a host material and at least one composite particle and an optoelectronic devise including at least one composite particle or the film.

A multicolor light-storing ceramic for fire-protection indication and a preparation method thereof are provided. The preparation method includes: adding a glass based raw material, a light-storing powder, a dispersant and an alumina powder into a granulator, adding water mixed with a pore-forming agent and then mechanically stirring for granulation; adding a plasticizer after the stirring of 4˜8 h, and continuing the stirring for 1˜3 h to thereby obtain a mixture; packing the mixture into a mold and performing tableting; demolding and obtaining a light-storing self-luminous quartz ceramic by drying and firing using a kiln; printing a pattern onto a surface of the ceramic and then curing to obtain a light-storing ceramic for indication sign. Using an industrial waste glass has advantages of low sintering temperature and green environmental protection; dispersed pores and alumina introduced as scattering sources improves light absorption efficiency, fluorescence output phase ratio and light transmission of the ceramic.

A user device for monitoring a physical condition of a user, such as a heart rate or blood oxygen level, includes an erbium doped glass component and a light source. The light source is configured to generate light equal to an excitation frequency of the erbium doped glass. The erbium doped glass component is configured to generate, through photoluminescence, one or more peaks of higher intensity light corresponding to a wavelength which can be used to monitor a physical condition of a user. The amplified light is sent to the user and received back at a photodetector, which can then algorithmically determine a physical condition of a user.

A user device for monitoring a physical condition of a user, such as a heart rate or blood oxygen level, includes an erbium doped glass component and a light source. The light source is configured to generate light equal to an excitation frequency of the erbium doped glass. The erbium doped glass component is configured to generate, through photoluminescence, one or more peaks of higher intensity light corresponding to a wavelength which can be used to monitor a physical condition of a user. The amplified light is sent to the user and received back at a photodetector, which can then algorithmically determine a physical condition of a user.

A glass that includes Pr.sub.2O.sub.3 and Nd.sub.2O.sub.3 such that the sum of Pr.sub.2O.sub.3 and Nd.sub.2O.sub.3 is greater than 0.2 mole % and the ratio of Nd.sub.2O.sub.3 to Pr.sub.2O.sub.3 is greater than 0.5 and less than 3. Further, the sum of any chromophores in the glass from the group V.sub.2O.sub.5, Cr.sub.2O.sub.3, MnO, Mn.sub.2O.sub.3, Fe.sub.2O.sub.3, CoO, Co.sub.3O.sub.4, CuO, NiO, Nb.sub.2O.sub.5, CeO.sub.2, Ho.sub.2O.sub.3 and Er.sub.2O.sub.3 is less than 0.1 mole %. The glass can be characterized by a substantially pink color upon exposure to an incandescent light source and a substantially green color upon exposure to a fluorescent light source. The glass can optionally include one or more fluorescent ions selected from oxides of Cu, Sn, Mn, Ag, Sb, Ce, Sm, Eu, Tb, Dy, Tm, and combinations thereof, such that a total concentration of fluorescent ions is from greater than or equal to about 0.01 mole % to less than or equal to about 5.0 mole %.

A glass that includes Pr.sub.2O.sub.3 and Nd.sub.2O.sub.3 such that the sum of Pr.sub.2O.sub.3 and Nd.sub.2O.sub.3 is greater than 0.2 mole % and the ratio of Nd.sub.2O.sub.3 to Pr.sub.2O.sub.3 is greater than 0.5 and less than 3. Further, the sum of any chromophores in the glass from the group V.sub.2O.sub.5, Cr.sub.2O.sub.3, MnO, Mn.sub.2O.sub.3, Fe.sub.2O.sub.3, CoO, Co.sub.3O.sub.4, CuO, NiO, Nb.sub.2O.sub.5, CeO.sub.2, Ho.sub.2O.sub.3 and Er.sub.2O.sub.3 is less than 0.1 mole %. The glass can be characterized by a substantially pink color upon exposure to an incandescent light source and a substantially green color upon exposure to a fluorescent light source. The glass can optionally include one or more fluorescent ions selected from oxides of Cu, Sn, Mn, Ag, Sb, Ce, Sm, Eu, Tb, Dy, Tm, and combinations thereof, such that a total concentration of fluorescent ions is from greater than or equal to about 0.01 mole % to less than or equal to about 5.0 mole %.

A preparation method and use of a yellow fluorescent glass ceramic are disclosed. The preparation method includes: mixing a monomer, a cross-linking agent and a filling solvent evenly, then adding fumed silica and stirring evenly, further adding an ultraviolet (UV) photoinitiator and an UV absorber, and stirring thoroughly; adding a yellow phosphor (Y,Gd)AG:Ce, stirring thoroughly and defoaming to obtain a slurry; introducing the slurry into a mold, and curing by UV irradiation or three-dimensional (3D) printing to obtain a body; putting the body into a high-temperature furnace for heating to obtain a phosphor-embedded porous silica glass; putting the porous silica glass into a high-temperature vacuum furnace for densification and sintering to obtain a densified fluorescent glass ceramic; and finally cutting and surface-polishing.

A preparation method and use of a yellow fluorescent glass ceramic are disclosed. The preparation method includes: mixing a monomer, a cross-linking agent and a filling solvent evenly, then adding fumed silica and stirring evenly, further adding an ultraviolet (UV) photoinitiator and an UV absorber, and stirring thoroughly; adding a yellow phosphor (Y,Gd)AG:Ce, stirring thoroughly and defoaming to obtain a slurry; introducing the slurry into a mold, and curing by UV irradiation or three-dimensional (3D) printing to obtain a body; putting the body into a high-temperature furnace for heating to obtain a phosphor-embedded porous silica glass; putting the porous silica glass into a high-temperature vacuum furnace for densification and sintering to obtain a densified fluorescent glass ceramic; and finally cutting and surface-polishing.