Solid-state high-luminance far ultraviolet light emitting element including highly pure hexagonal boron nitride single crystal
AssigneeNational Institute for Materials Science
InventorsKenji Watanabe, Takashi Taniguchi, Satoshi Koizumi, Hisao Kanda, Masayuki Katagiri, Takatoshi Yamada, Nesladek Milos
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Abstract
A solid-state far ultraviolet light emitting element is formed by a hexagonal boron nitride single crystal, excited by electron beam irradiation to emit far ultraviolet light having a maximum light emission peak in a far ultraviolet region at a wavelength of 235 nm or shorter.
Claims4
A solid-state far ultraviolet light emitting element consisting of a hexagonal boron nitride single crystal which is substantially free of oxygen impurities, excited by electron beam irradiation to emit far ultraviolet light having a maximum light emission peak in a far ultraviolet region at a wavelength of 235 nm or shorter,
- wherein said hexagonal boron nitride single crystal is obtained by high-temperature and high-pressure treatment from 20,000 to 60,000 atmosphere pressure at least 1500° C., and
- said high-temperature and high-pressure treatment uses alkali earth metal boron nitride which is substantially free of oxygen impurities or alkali metal and alkali earth metal boron nitrides which are substantially free of oxygen impurities as a solvent.
Dependencies are inferred from the claim text.