PHOSPHOR, METHOD FOR PRODUCING PHOSPHOR, PHOSPHOR-CONTAINING COMPOSITION, AND LIGHT-EMITTING DEVICE

摘要

Disclosed is an alkaline earth metal halogen phosphor which exhibits high light emission characteristics even when it is used with an excitation light source emitting near ultraviolet light. Also disclosed are a phosphor-containing composition and a light-emitting device, each using such a phosphor. Further disclosed are an image display device and an illuminating device, each using such a light-emitting device. Specifically disclosed is a phosphor which is characterized by having a chemical composition represented by the formula (1) below, and having an external quantum efficiency of not less than 77% when excited with light having a wavelength of 400 nm. (Sr10-x-y-zMxEuyMnz)(PO4)6(Cl1-aQa)2 (1) (In the formula (1), M represents at least one element selected from the group consisting of Ba, Ca, Mg and Zn; Q represents at least one element selected from the group consisting of F, Br and I; and x, y, z and a satisfy the following relations: 0 = x = 10, 0.3 = y = 1.5, 0 = z = 3, 0 = a = 1 and x + y + z = 10.)