VISIBLE LIGHT-EMITTING MATERIAL AND VISIBLE LIGHT-EMITTING DEVICE

摘要

It is intended to provide a visible light-emitting material characterized by comprising at least one ion, which is a trivalent rare earth ion serving as the light emission center, selected from the group consisting of praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium and thulium (a first group) and a divalent rare earth ion selected from the group consisting of ytterbium or europium (a second group).