Semiconductor light emitting element

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In a semiconductor light-emitting element, an underlayer is made of a high crystallinity Al-including semiconducting nitride material of which the FWHM is 90 seconds or below in full width at half maximum of an X-ray rocking curve. A light-emitting layer is made of a semiconducting nitride material including it least one element selected from the group consisting of Al, Ga and In and containing at least one element selected from rare earth metal elements. The light-emitting layer can be omitted if at least one element selected from rare earth metal elements is incorporated in the underlayer.