Light-emitting device

摘要

[Problem] To provide a light-emitting device which does not undergo the deterioration in luminous efficiency associated with the long-term use.;[Solution] A light-emitting device (1) comprises a light-emitting element (10) which can emit blue light and a phosphor (2) which is composed of a single kind of single crystal and can emit yellow light upon the irradiation with the light emitted from the light-emitting element (10) which serves as excitation light. Thus, it becomes possible to prevent the deterioration in luminous efficiency associated with the deterioration in a binder or the like compared with a light-emitting device which utilizes multiple kinds of granular phosphors, because any binder for binding phosphors to each other is not required in the light-emitting device (1).

主权项

1. A light-emitting device, comprising:
a light-emitting element to emit a blue light; and a phosphor comprising a single monocrystal to emit a yellow light by being excited by the light emitted from the light-emitting element, wherein the phosphor comprises a composition represented by Y3-x-yLxMyAl5-zNzO12-w, where L is Gd or Lu, M is one or more elements selected from the group consisting of Ce, Tb, Eu, Yb, Pr, Tm and Sm, N is Ga or In, 0≦x<3, 0.003≦y≦0.2, 0≦z≦5 and −0.2≦w≦0.2.