Tokyo Gas Company Limited

Aki Kawamura

Kazuo Nakamura

Kenichi Nakamura

Satoshi Yamashita

Takahiro Ide

Takefumi Ishikura

Kenji Horiuchi

A small, simple current-injection diamond ultraviolet light-emitting device comprising a high-quality diamond grown by chemical vapor deposition (CVD) method (), a surface conductive layer () provided on the surface of the diamond, and electrodes () provided on the surface conductive layer. The device is a free-exciton recombination emission diamond ultraviolet light-emitting device comprising a CVD diamond crystal where the free-exciton recombination radiation (235 nm) caused by current injection is dominant.

Diamond ultraviolet light-emitting device

A diamond ultraviolet luminescent element () having a current-injection light-emitting diode structure includes a high-quality boron-doped p-type diamond crystal (semiconductor layer) () synthesized by the high pressure and high temperature method; a phosphorous-doped n-type diamond crystal (n-type semiconductor layer) () formed on the first diamond surface by the chemical vapor deposition; an electrode () formed on the surface of the n-type semiconductor layer (); and an electrode () formed on the surface of the p-type semiconductor layer (). The luminescence (235 nm) attributed to the recombination of free excitons resulting from current injection dominates in ultraviolet wavelength region ().

Diamond ultraviolet luminescent element

Growing community of inventors

Tokyo, Japan

Aki Kawamura