Abstract: This eyewear is provided with: a frame; a lens which is supported by the frame, and which includes an optical characteristic varying portion having an optical characteristic which is varied by means of electric control; a communication portion for receiving information from an external terminal; and a control portion for controlling the optical characteristic varying portion on the basis of the information received from the external terminal.

Abstract: The present invention related to a nitride phosphor represented by the following general formula (1), the nitride phosphor having an x value of less than 0.43 in luminescent color coordinates (x, y) upon being excited with excitation light of 455 nm, and a reflectance Ra of 89% or more at 770 nm; LnxSiyNn:Z??(1), wherein Ln is a rare-earth element excluding the element used as an activator, Z is an activator, x satisfies 2.7?x?3.3, y satisfies 5.4?y?6.6, and n satisfies 10?n?12.

Abstract: The present invention related to a nitride phosphor represented by the following general formula (1), the nitride phosphor having an x value of less than 0.43 in luminescent color coordinates (x, y) upon being excited with excitation light of 455 nm, and a reflectance Ra of 89% or more at 770 nm; LnxSiyNn:Z??(1), wherein Ln is a rare-earth element excluding the element used as an activator, Z is an activator, x satisfies 2.7?x?3.3, y satisfies 5.4?y?6.6, and n satisfies 10?n?12.

Abstract: Problem to be solved is to provide a nitride phosphor having enhanced luminance, internal quantum efficiency and external quantum efficiency compared to those of conventional nitride phosphors. The nitride phosphor is represented by the general formula (1) shown below and it is characterized in that the infrared spectroscopy measured by the diffuse reflection method at the measurement intervals of 2 cm?1 or lower, satisfies predetermined conditions: LnxSiyNn:Z??(1) (In the general formula (1), Ln represents rare earth element excluding the element to be used as an activator, Z represents an activator, x satisfies the condition of 2.7?x?3.3, y satisfies the condition of 5.4?y?6.6, and n satisfies the condition of 10?n?12.

Abstract: A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth aluminate phosphor which is a phosphor represented by the formula a (M1-xEux)O.6Al2O3 (wherein M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, and x and a satisfy 0<x<1 and O.9?a?1.8, respectively) and which has a wide-band peak over an angle region of diffraction angle (2?) of from 28° to 31° in powder diffraction X-ray spectrum by CuK?1 characteristics X-ray, and a vacuum ultraviolet excitation light emitting element provided with a fluorescent layer made of the phosphor.

Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.

Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.