Patent ID: 8427044

Claim:
A light emitting device, comprising: a mixture of a first phosphor, and a second phosphor that is different from the first phosphor; and at least one semiconductor light emitting device that emits visible light; wherein: each of the first phosphor and the second phosphor is independently selected from the group consisting of oxides, oxynitrides and nitrides; each of the first phosphor and the second phosphor has a luminous efficiency of 35% or higher when excited by the visible light from the semiconductor light emitting device at room temperature; the second phosphor is capable of absorbing emitted light from the first phosphor; the first phosphor is present in the mixture of phosphors in an amount of at least 85 weight %; the second phosphor has the following formula (3): M a A b D c E d X e (3) wherein: M is Eu and optionally at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm, and Yb; A is selected from the group consisting of bivalent metal elements other than M; D is at least one element selected from the group consisting of tetravalent metal elements; E is at least one element selected from the group consisting of trivalent metal elements; X is at least one element selected from the group consisting of O, N, and F; and a, b, c, d, and e satisfy the following conditions: a+b=1; 0.00001≦a≦0.1; 0.5≦c≦1.8; 0. 5≦d≦1.8; 0.8×(2/3+4/3 ×c+d )≦ e ; and e≦ 1.2×(2/3+4/3 ×c+d ).