Patent ID: 8269237

Claim:
A light-emitting device, comprising: a light-emitting element emitting excitation light for exciting a fluorescent body; a dispersion body having said fluorescent body dispersed therein, said fluorescent body emitting fluorescent light having a wavelength different from that of said excitation light; and a lead frame upon which said light-emitting element and said dispersion body are separately mounted such that said light-emitting element and said dispersion body are spaced apart; wherein at least a portion of the fluorescent light emitted from said fluorescent body in said dispersion body is output to the outside of said light-emitting device through a side of said dispersion body receiving said excitation light without being retransmitted through said dispersion body after passing through the side of said dispersion body receiving said excitation light, at least another portion of the fluorescent light emitted from said fluorescent body in said dispersion body is output to the outside of said light-emitting device through a side opposite of the side of said dispersion body receiving said excitation light without being transmitted through said dispersion body after passing through the side opposite of the side of said dispersion body receiving said excitation light, a content of said fluorescent body in said dispersion body is set such that, in fluorescent light emitted from said fluorescent body in said dispersion body, intensity of reflected fluorescent light emitted to the side receiving said excitation light becomes larger than intensity of transmitted fluorescent light emitted to a side transmitting said excitation light, the another portion of the fluorescent light is not reflected until after passing through the opposite side of the dispersion body, the portion of the fluorescent light and the another portion of the fluorescent light are output to the outside of said light-emitting device from a window portion for outputting the fluorescent light, said light-emitting element is formed with at least one nitride-based semiconductor laser, and said nitride-based semiconductor laser and said dispersion body are arranged such that light emitted from said nitride-based semiconductor laser enters said dispersion body with P polarization and at an incidence angle of at least 30 degrees and at most 70 degrees, such that a portion of the excitation light reflected by the side of said dispersion body receiving said excitation light is decreased and a utilization efficiency of the excitation light is increased.