Abstract: Provided is a phosphor in which a first phase and a second phase are three-dimensionally entangled with each other. The phosphor further includes a third phase different from the first phase and the second phase, in a cross-sectional visual field in a predetermined range, an area ratio of the third phase in the phosphor is 0.5% to 3.0%, and at least a part of the third phase is a bridging third phase existing at a position where a part of the first phase and another part of the first phase are bridged.

Abstract: A phosphor and a light source device having the phosphor having a high internal quantum yield by enabling a large Ce amount, capable of shifting the fluorescence wavelength of yellow fluorescence to the long wavelength side, having satisfactory heat quenching resistance, and excellent in blue light transmittance. The phosphor includes a Ce:YAG single crystal having a Ce amount of 0.7 parts by mole or more when the total amount of Y and Ce is 100 parts by mole.

Abstract: Provided is a transparent phosphor in which one surface is rougher than the other surface.

Abstract: A phosphor having a variable wavelength and a light irradiation device having said phosphor. This phosphor contains an activating agent, and has a concentration gradient of the activating agent along at least one direction.

Abstract: Provided is a crucible capable of improving uniformity of a temperature distribution of a melt drawn by a seed crystal and obtaining a crystal having a more uniform composition, and a crystal growth equipment including the crucible. The crucible includes a melt storage portion 24 that stores a melt that is a raw material of a crystal, and a die unit 34 that controls a shape of the crystal. The die portion 34 includes a die flow path 36 through which the melt 30 is passed from a storage portion outlet 32 provided on a bottom surface of the melt storage portion 24 toward a die outlet 38 provided on an end surface of the die portion 34. The die flow path 36 includes a narrow portion 36a1 whose flow path cross-sectional area is smaller than an opening area of the die outlet 38.

Abstract: Provided is a method for producing a crystal body that can obtain a crystal body having a relatively large size and a more uniform composition, and a novel single crystalline phosphor obtained by the above producing method. The single crystalline phosphor contains YAG or LuAG as a main component and at least one element of Ce, Pr, Sm, Eu, Tb, Dy, Tm, and Yb as an accessory component. In a cross section of the single crystalline phosphor, a uniform concentration region in which the accessory component is uniformly distributed is located in a central portion of the cross section, and an area ratio of the uniform concentration region to a cross-sectional area of the cross section is 35% or more.

Abstract: A phosphor and a light source device having the phosphor having a high internal quantum yield by enabling a large Ce amount, capable of shifting the fluorescence wavelength of yellow fluorescence to the long wavelength side, having satisfactory heat quenching resistance, and excellent in blue light transmittance. The phosphor includes a Ce:YAG single crystal having a Ce amount of 0.7 parts by mole or more when the total amount of Y and Ce is 100 parts by mole.

Abstract: A phosphor includes a high concentration region and at least one of low concentration regions lower in concentration of an additive than the high concentration region. The high concentration region surrounds at least one of low concentration regions.