NITRIDE PHOSPHOR AND LIGHT-EMITTING DEVICE USING SAME

摘要

Disclosed are a red phosphor having excellent emission characteristics, and a light-emitting device using such a red phosphor. Specifically disclosed is a europium-activated nitride phosphor which absorbs near ultraviolet to blue light and emits red light. This nitride phosphor is represented by the general formula below with w, x, y and z being within the ranges shown below, and it further contains at least one of rare earth elements, tetravalent elements and trivalent elements as an additive element. M_wAl_xSi_yN_{((2/3)w + x + (4/3)y)}:Eu²⁺ (In the formula, M represents at least one element selected from Mg, Ca, Sr and Ba; and 0.04 = w = 9, x = 1, 0.056 = y = 18.) Since the peak wavelength can be shifted to a longer wavelength, this nitride phosphor is able to emit deeper red light even when the activation amount of europium, which is an expensive rare earth element, is reduced.