| abstract |
Provided is a method for manufacturing a wavelength conversion member comprising a polycrystalline ceramics, the method including the steps of: A) mixing a substance serving as a silicon source, a substance serving as an aluminum source, a substance serving as a calcium source, and a substance serving as a europium source; B) firing the obtained mixture to obtain an oxynitride phosphor powder; then C) sintering the oxynitride phosphor powder in an inert atmosphere to obtain the polycrystalline ceramics, characterized in that the sintered oxynitride phosphor powder has a composition (excluding oxygen) represented by the compositional formula: Ca x1 Eu x2 Si 12-(y+Z) Al (y+z) O z N 16-z (in the formula, x1, x2, y, and z are values such that 0<x1¤3.40, 0.05¤x2¤0.20, 3.5¤y¤7.0, 0¤z¤1), and the oxygen content of the oxynitride phosphor powder exceeds the stoichiometric oxygen content of the oxynitride phosphor represented by compositional formula (1) below, the excess amount of oxygen being from 1.1 to 11.5 mass%, inclusive, where the stoichiometric mass of the oxynitride phosphor represented by compositional formula (1) is expressed as 100 mass%. Also provided is a wavelength conversion member that, upon excitation by light of 300 nm to 500 nm wavelengths, emits fluorescent light in a broad wavelength band having a peak wavelength of from 590 nm to 610 nm, doing so at high conversion efficiency. Also provided is a wavelength conversion member that is more durable and more highly efficient than the prior art. Also provided is a light-emitting device in which the wavelength conversion member and a semiconductor light-emitting element are combined. |