| http://www.w3.org/ns/prov#value | - The thin-film layered structure 18 (i.e., the LEDs 11) emits near-ultraviolet rays or ultraviolet rays, and is formed of a thin-film layered structure having heterostructure or double-heterostructure composed of a plurality of layers such as gallium nitride or indium gallium nitride, aluminum gallium nitride or aluminum nitride and the like.
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