| abstract |
A semiconductor light emitting element, semiconductor light emitting device or image display device includes a wavelength converter for converting a wavelength into another, optical reflector having a wavelength selectivity and a light absorber having a wavelength selectivity, which are disposed in a predetermined positional relation, to prevent external leakage of primary light and to extract secondary light made by wavelength-converting the primary light with a very high efficiency. By using a semiconductor light emitting element for ultraviolet emission, or by combining it with a fluorescent material or any other appropriate material having a wavelength converting function, various kinds of applications, such as illuminator, having a remarkably long-life light source can be made. The semiconductor light emitting element preferably has a emission wavelength near 330 nm, and preferably uses BGaN in its light emitting layer. These light emitting element and device are stable in emission wavelength and can be readily configured for highly efficient wavelength conversion of any wavelength in a wide wavelength range from the visible light band to the infrared band. They can be used in various kinds of devices and instruments requiring a light source to simplify their structures, decreasing their sizes and weights, stabilize their emission wavelengths and quantities of light and elongate their lives. |