Light emitting diode with fluorescent material

摘要

A light-emitting device can be configured to have little variation in light emission characteristics even at increased temperatures. A light-emitting device can include a light-emitting section for emitting light with a predetermined wavelength, and a fluorescent material for absorbing a part of light emitted from the light-emitting section and emitting light with a longer wavelength. The light-emitting device can mix the light with the predetermined wavelength from the light-emitting section and the light with the longer wavelength from the fluorescent material, and thereby emit a mixed light. The fluorescent material can include single crystal grains in which primary grains have a diameter of 1 μm or less. Crystal defects, such as a grain boundary, do not often and sometimes never occur in the single crystal grain having a diameter of 1 μm or less. Thus, it is possible to restrain a phenomenon in which a crystal defect non-radially emits absorbed energy (as heat) which then reduces light emission efficiency.